Low Flow Meters

What is a low flow meter?

Low Flow Meters refer to those flow meters that can be used to measure micro-flow-low-flow rate media. Including metal rotor type, gear type, electromagnetic type microflow meter, microturbine type, and thermal type small mass flow meter. It can measure the Low flow rate of a variety of liquids and gases. For example, it needs small volume, high-temperature resistance, low-temperature resistance, or medium viscosity. etc. We all have suitable product recommendations.

What is a low flow meter?

Sino-Inst specializes in low flow meters for micro to low flow rates. We offer:
Ultrasonic flowmeter can measure low flow rates from 0.1m/s to 5.0m/s.
The gear flowmeter can measure the microflow rate from 0.01 to 0.83.
Coriolis mass flow meters and controllers from 10SCCM~30SLM.
Below, we also introduce a lot of flow meters. based on vortex, electromagnetic, ultrasonic, and positive displacement, etc.

Flow range of flow meters

First, let’s take a look at the low flow rate measurement range of conventional flow meters.

Flow meterMediaDNFlow Range (m³/h)L/min 
Electromagnetic Flowmeterliquid150.19~3.18 3.166~53
Turbine flowmeterliquid40.04~0.250.666~4.166
Vortex FlowmeterGas; liquid153~15;0.3~550~250; 5~83.30
Precession Vortex Gas Flowmetergas151~716.66~116.666
Ultrasonic Flow Metersliquid150~±12m/s
Differential Pressure Flow MetersLiquid; gas150.8m/s
Oval gear flowmeterliquid100.03-0.2  0.5~3.33
Gear flow meterliquid20.0006~0.0500.01~0.833
Coriolis Mass FlowmeterLiquid; gas30~96~144 kg/h
Thermal gas mass flow metergas60.1~120Nm/s
Metal rotor flowmeterGas; liquid150.07~0.7; 2.5~251.166~ 11.66;41.666 ~416.66

Read more about: The Pros and Cons of Micro Motion Flow Transmitters

Low flow meters for Liquids

Model Measure Range    L/HMeasure Range L/min
GF020.6-500.01~0.83
GF045-2500.083~4.16
GF0610-5000.167~8.33
GF1050-12000.83~20
GF15200-30003.33~50
GF251000-1200016.67~200
GF322000-2000033.33~333
ProductStrap on Flowmeter
ModelX3
Flow range0.1m/s~5.0m/s
Accuracy±2.0%
Repeatability0.80%
Pipe sizeφ6.35~φ90
MoeldX3-φ6.35X3-φ9.53 X3-φ12.7X3-φ15X3-φ20X3-φ25
Weight(KG)0.910.910.90.90.840.84
MoeldX3-φ32X3-φ40X3-φ50X3-φ63X3-φ75X3-φ99
Weight(KG)0.820.880.981.431.521.95

Mini Turbine Flowmeter
Caliber
(mm)
Measuring range
(L/min)
Factor
1.15mm0.035-1.60.5
1.3mm0.01-1.860.6
1.5mm0.045-2.080.67
2.0mm0.085-2.321.02
2.5mm0.12-2.41.44
MaterialShell: brass nickel plated/brass/plastic
Bearing: INO×18/8 (1.4305) stainless steel
Impeller: PVDF (polyvinylidene fluoride)
Magnet: SrFeO ceramic, ultrasonic welding
sealMVQ (silicone rubber “O” ring)
temperature range-10℃~+100℃
Accuracy class±2%
Repeat accuracy±0.20%
Pressure rangeMaximum 2MPa
Installation methodHorizontal installation
Dimensions (L×B×H)40×55×40mm
connectMPM connector
Provide power4.5~24VDC
OutputOpen collector
Maximum (extra) voltage output25VDC
Maximum current output25mA
ThreadG1/8 or G1/4
Threaded microflow target type flowmeter
Pipe diameter:DN6mm—50mm (threaded type)
Accuracy:±0.2/ ±0.5/ ±1.0 (liquid flow meter);
±:
-196°C to +700°C.
pressure:Negative pressure -70Mpa
Measuring range ratio:1:100 times; 1:50 times; 1:30 times; 1:10 times
Flow range:Liquid: DN6 to DN80 starting at 0.1L/h (ultra-small flow);
Gas: DN6 to DN80 starting at 15L/h (ultra-small flow);

Extended Reading: Liquid Turbine Flow Meter

Measuring rangeLow range: 10SCCM~30SLM
Medium range: 30SLM~300SLM
Large range: 500SLM~3000SLM
Accuracy (under standard conditions after zero adjustments)±1%F.S
Repeatability±1%F.S
Zero drift & full-scale drift0.02%F.S/C/Atm
Working range/range adjustable ratio2%~100%F.S/50:1
Maximum measurable flow100%F.S (controllable)
Typical response time200 milliseconds (adjustable)
Start-up warm-up time<5 seconds

Extended reading: Micro flow meters for low flow liquids

Low flow meters for Gas

ModelCaliberMechanical interfaceFLow Range: SLPMFLow Range: NCMH
MF57066mm1/4″10
25
0.6
1.5
MF571212mm1/2″20012

Measuring medium:Various gases (except acetylene gas and mixed gas)
Measuring pipe diameter:DN3, 6, 8, 10
Flow range:30, 60, 80, 100, 300, 600, 800, 1000 sccm;
10, 20, 30, 50, 80, 100 SLPM 
Flow measurement accuracy:±1.5%FS; ±2.5%FS
range of working temperature:-25℃-55℃
Working pressure range:0.3MPa, 0.6MPa, 1.0MPa
Power supply:24VDC±10%;
output signal:4-20mA, RS485 communication;

Read more about: Benefits Of Digital Gas Mass Flow Meters

FAQ

  • Coriolis Meters.
  • DP Meters.
  • Magnetic Meters.
  • Multiphase Meters.
  • Turbine Meters.
  • Ultrasonic Meters.
  • Vortex Meters.

Extended reading: How does a rotameter work

The water flow meter is an instrument specially used to measure the flow of water in pipes. You can get many different types of water flow meters from your facility.

When used in certain applications, each flow meter has its own advantages. For many pipelines and similar systems, the water must be maintained at a specified flow rate to ensure the effective operation of the system.

Read more: Digital Water Flow Meters

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Sino-Inst, Manufacturer for Low Flow Meters. For example crude oil flow meter, diesel flow meter, gasoline flow meter.

Sino-Inst’s Low Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

What Is Capacitance Liquid Level Sensor & How Dose It Work?

What is a capacitive liquid level sensors?

Capacitive liquid level sensor is an instrument for continuous measurement of liquids and converting it to an electrical signal.

Capacitive liquid level sensors play a pivotal role in obtaining precise, continuous measurements of liquids within containers. Being versatile enough to work seamlessly with fuels, oils, water, and coolant fluids. At its core, this sensor gauges the liquid’s height and transforms that data into an electrical signal. This valuable signal can then interface with various instruments, enabling users to visualize, monitor, record, or manage the liquid’s level.

Capacitive liquid level sensor with good structure and installation method can be applied to high temperature, high pressure, strong corrosion, easy to crystallize, anti-clogging, anti-freezing, and solid powder and granular materials.

Sino-Inst’s capacitive liquid level sensor can measure the liquid level of a highly corrosive medium. It measures the liquid level of a high-temperature medium. It measures the liquid level of sealed containers. It has nothing to do with the viscosity, density, and working pressure of the medium.

Features of capacitive liquid level sensors

  • The structure is simple, without any movable or elastic components. Therefore, the reliability is extremely high and maintenance is minimal. Under normal circumstances, it is not necessary to carry out regular large, medium and small maintenance.
  • Various signal output. Facilitate the configuration of different systems.
  • Suitable for liquid level measurement of high temperature and high-pressure vessels. And the measured value is not affected by the temperature, specific gravity of the liquid being measured and the shape and pressure of the container.
  • It is especially suitable for the measurement of strong corrosive liquids such as acids and alkalis.
  • Perfect over-current, over-voltage, and power polarity protection.

Extended reading: Radar Non Contact Water Level Sensor

Capacitive liquid level sensors types

Extended Reading: How to Measure Volume of Liquid

How does a capacitive liquid level sensor work?

Define capacitor

What is a Capacitor?

A capacitor is a passive electronic component that stores and releases electrical energy. In its most basic form, a capacitor consists of two conductive plates separated by an insulating material known as a dielectric.

When voltage is applied to the plates, an electric field forms, causing positive and negative charges to accumulate on the plates.

This stored energy can later be discharged when needed. The capability of a capacitor to store energy is measured in Farads (F) and is referred to as its capacitance.

Connection Between a Capacitor and a Capacitive Liquid Level Sensor:

The principle behind a Capacitive Liquid Level Sensor is intrinsically tied to the concept of capacitance. Here’s how they relate:

Formation of a Capacitor:

In the context of a capacitive liquid level sensor, the probe (or immersed electrode) acts as one plate of the capacitor, and the opposing electrode (often the container or tank wall) serves as the other plate.

Role of the Liquid (Dielectric):

The liquid whose level is being measured acts as the dielectric medium in this capacitor setup. Different liquids have different dielectric constants, which can affect the capacitance.

Changing Capacitance:

As the level of the liquid changes, the portion of the probe submerged in the liquid varies. This changes the effective dielectric between the capacitor plates, leading to a change in capacitance. This variation in capacitance is directly proportional to the level of the liquid.

Measurement Principle:

The electronics in the sensor detect these changes in capacitance. By monitoring these changes, the sensor can determine the liquid’s level and convert it into a readable signal.

While a capacitor is a foundational component in electronics for energy storage, the principle of capacitance is what allows a Capacitive Liquid Level Sensor to function. The sensor effectively creates a dynamic capacitor whose properties change based on the liquid’s level, making it an ingenious application of basic electronic principles to real-world measurement challenges.

Capacitive liquid level sensor working principle

The Capacitive liquid level sensor is used to measure the change of capacitance to measure the level of the liquid level. The capacitive liquid level sensor is used to measure the change of capacitance to measure the unevenness of the liquid level.

The capacitive liquid level sensor is a metal rod pierced into the liquid container. The metal rod serves as a pole of the capacitor. The container wall serves as the other pole of the capacitor. The medium between the two electrodes is the liquid and the gas above it.

Because the dielectric constant ε1 of the liquid is different from the dielectric constant ε2 on the liquid surface. For example ε1>ε2.
Then when the liquid level rises, the total dielectric constant between the two electrodes of the capacitive liquid level gauge increases accordingly, so the capacitance increases.
Conversely, when the liquid level drops, the value of ε decreases and the capacitance also decreases.

Therefore, the Capacitive liquid level sensor can measure the unevenness of the liquid level by changing the capacitance between the two electrodes. The sensitivity of the Capacitive liquid level sensor mainly depends on the difference between the two dielectric constants.

Moreover, as long as ε1 and ε2 are stable, the liquid level measurement is accurate. Because the measured medium has conductivity. Therefore, the metal rod electrode is covered by an insulating layer.

The capacitive liquid level sensor is small in size, simple to complete remote transmission and scheduling, suitable for liquid level measurement of corrosive and high-pressure media.

Extended Reading: GWR Level Sensor for High Temperature & High Pressure

Let’s watch a video. It will help you understand the working principle of the capacitive liquid level sensor.

Video source: https://www.youtube.com/watch?v=0du-QU1Q0T4

Extended reading: Non-Contact Level Measurement

Advantages of Capacitance Level Sensors:

  • Versatility: These sensors perform well with various dielectric fluids, making them suitable for a wide range of applications.
  • Durability: Their robust design, often using stainless steel, means they are resistant to most fluids and harsh conditions. This ensures a long service life.
  • No Moving Parts: Their absence of moving components ensures they require minimal maintenance, which is particularly advantageous in challenging environments.
  • High-Temperature Compatibility: Since they don’t have sensitive components submerged in the liquid, they can operate in hotter fluids where some other sensors might struggle.
  • Sealed System Compatibility: Their design allows them to function efficiently in sealed pressurized or evacuated vessels without any significant impact on performance.
  • Simplicity: With a straightforward mechanical structure, they are less prone to mechanical breakdowns.

Disadvantages of Capacitance Level Sensors:

  • Conductive Fluid Limitation: These sensors might face challenges with conductive fluids unless they come with an insulated outer tube.
  • Coating Issues: Thick or sticky media might coat the probe, creating an insulation layer that can lead to malfunctions or compromised performance.
  • Calibration Necessity: They require calibration to distinguish the difference between liquid and air accurately. This might need occasional recalibration based on the medium.
  • Dielectric Constant Sensitivity: Changes in the medium that cause the dielectric constant to shift can impact the sensor’s performance.
  • Possible Obstruction: The probe might protrude into the liquid, causing obstruction, attracting fouling, or even raising hygiene concerns in certain applications.

Capacitive level sensor Applications

The capacitive liquid level sensor is used to measure the liquid level (level) of conductive and non-conductive liquids (solids) under pressure in pressure vessels.

A capacitive liquid level sensor can convert the changes of various liquid level parameters into standard current signals. Remote transmission to the operating room. For the secondary instrument or computer device for centralized display, start emergency signal or automatic control.

Combine the user’s specific process conditions, equipment structure, and use requirements. Through the flexible combination of the material, structure, and installation method of the level gauge. It is suitable for continuous detection of liquid level, material level or material level under special conditions such as high pressure, high temperature, strong corrosion, easy crystallization, anti-blocking, anti-freezing, and solid powder and granular materials. It can be widely used in detection and control in various industrial processes.

Capacitive level sensor application:

  • Conductive, insulating liquid-chemical industry, oil field, water and sewage treatment
  • Conductive and insulating slurry-papermaking, pharmaceutical, water and sewage treatment
  • Powder, ash, powder-power plant, metallurgy, cement
  • Pellets, coal, grain-power plants, metallurgy, grain
  • Interface, two different liquids-oil field, chemical industry

Extended reading: Radar Liquid Level Sensor|Corrosive, steam, volatile liquids

Extended reading: Radar Water Level Sensor Applications

Capacitive oil level sensor

The capacitive fuel level sensor refers to a capacitive liquid level transmitter used to measure the oil level. According to the principle of capacitance sensing, when the height of the measured electrode dips and changes, the capacitance of the measured electrode changes. It can convert the change of oil level into a standard current signal. It is remotely transmitted to the operation control room for the secondary instrument or computer device for centralized display, alarm, or automatic control.

Read more about Capacitive Fuel Level Sensor

Extended Reading: Low Cost Float Level Sensor for Tank Liquid Volume Monitoring

Capacitive sensor for water level measurement

A capacitive water level sensor is often used to measure the water level of the water storage tank. The capacitive water level sensor uses the change of measuring capacitance value to measure the height of the liquid level. The main function is to continuously measure the liquid level of the measured medium liquid. For example, common media are sewage, mud, paper pulp, eight-treasure porridge, and so on. You may also have heard of a non-contact capacitive water level sensor. It is a kind of capacitive water level sensor installed externally.

Read More about Contact and Non-contact | Capacitive water level sensor

Read more about: Hydrostatic Submersible Level Transmitter-Straight Rod Insertion

Capacitive level switch

The principle of a Capacitive level switch is a position sensor with switch output.

The capacitive level switch is composed of an electronic circuit module unit and sensor rod. The induction pole and the barrel wall are used as the two electrodes of the capacitor.

When the material between the two electrodes changes, the capacitance value changes. After the electronic circuit unit detects this capacitance value change. The analysis and processing unit are compared with the set capacitance value. When it is higher than the set value, a switch signal is an output.

It is widely used for position detection in various high temperature, high pressure, strong acid and strong alkali, and various powder and particle environments in petroleum, chemical, metallurgical, light industry, coal, cement, grain, and other industries.

Extended reading: Diesel fuel tank level gauges & indicators

Extended Reading: What is level transmitter working principle?

Extended reading: Ultrasonic liquid level sensors

More Featured Level Senors

Extended reading: Ultrasonic level transmitter for Hazardous Liquids

Related Blog

Extended reading: Corrosive Liquid Chemical Level Sensor in Chemical Processing

Sino-Inst offers over 10 Capacitive Level Sensors for level measurement. About 50% of these are RF level meters, 40% is the tank level sensor.

A wide variety of Capacitive Level Sensors are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Capacitive Level measurement instrumentation, located in China.

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Gear Flow Meter-High Viscosity Fluid-Micro Flow Solution

A gear flow meter is a common positive displacement flow meter. The gear flow sensor has built-in double gears to operate. The volume of the medium is calculated by the volume of the gear. The flow rate of the small fluid medium is measured.

  • It can measure fluids with a viscosity of up to 10000 Pa.s.
  • The lowest flow rate can be measured 0.6L/H. That is 0.0026 GPM.


Gear flow meters can be used for resin and glue flow measurement. Flow measurement of hydraulic oil, lubricating oil, and grease. Maltose, syrup. Fuel oil flow measurement. Flow measurement of ink and asphalt. Flow measurement of liquid nitrogen, freezing liquid, and solvent. Edible oil, fish oil, and food filling measurement. Chemical and anti-corrosion requirements fluid measurement. A fluid quantitative control system, etc.

Get a Quote More flowmeters

What is gear flow meter?

The gear flowmeter is a positive displacement flowmeter. It is a high-precision transmitter for measuring volumetric flow. It uses two or more elliptical gears to rotate at right angles to each other to form a T shape. With the flow of the medium, the gears mesh and rotate. Under the action of the fluid flow, a pressure difference is formed at both ends of the instrument inlet and outlet. No power supply is required. A pair of gears rotate freely. The cavity between the gears is filled with liquid. The liquid is discharged as it rotates. Measure the number of revolutions of the gear to know the flow rate of the liquid flowing through the instrument.

Gear flow meters are used to accurately measure the flow or instantaneous flow of liquid in the pipeline continuously or intermittently. It is especially suitable for the flow measurement of Maltose, syrup. heavy oil, polyvinyl alcohol, resin, and other high viscosity media.

There are various types of gear flow meters, mainly named after the shapes of internal components. For example, the circular gear flowmeter we will introduce in this article. There are also common oval gear flow meters, helical flow meters, etc.

Oval gear flowmeter
The oval gear flowmeter uses two oval gears to mesh and rotate. It is suitable for flow measurement of medium with higher viscosity.

Extended reading: Positive displacement flow meter working principle

Helical flow meter
The metering part of the spiral rotor flowmeter is mainly composed of a metering box and a pair of uniquely designed spiral rotors.

Extended reading: Cylinder Gear flow meter for micro flow measurement.

Circular gear flowmeter (spur gear flowmeter)
The circular gear flowmeter uses two circular gears to mesh and rotate. Suitable for microflow measurement.

Tool: Volumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

Gear flow meter

A gear flow meter is a micro digital positive displacement flow meter. Can measure very small flow rates and quantify small volumes of liquid. High and low-temperature resistance (-196℃-200℃).

The Gear flow meter for Microflow is made of stainless steel and is used for precise continuous or intermittent measurement of the flow or instantaneous flow of liquid. It is especially suitable for the flow measurement of heavy oil, polyvinyl alcohol, grease, and other high-viscosity media.

It can measure fluids with a viscosity of up to 10000 Pa.s.
The lowest flow rate can be measured at 0.6L/H. That is 0.0026 GPM.

Extended reading: Micro flow meters for low flow liquids

Gear flow transmitter is a type of positive displacement flow transmitter. It is a high-precision transmitter for measuring volume flow.

With the flow of the medium, the gears mesh and rotate. Under the action of the fluid flow, a pressure difference is formed at both ends of the instrument inlet and outlet. There is no need for a power supply. A pair of gears rotate freely. The cavity between the gears is filled with liquid. Discharge and measure the number of revolutions of the gear to know the flow of liquid and liquid flowing through the instrument.

Extended reading: Fluid flow meter types

Figure 1 Schematic diagram of fluid flow

The rotation speed of the round gear transmitter is detected by the sensor coil in the signal amplifier mounted on the watch case. The signal amplifier is not in contact with the measured medium. When the transmitter gear cuts the magnetic field lines generated by the permanent magnet in the housing, it will cause the magnetic flux in the sensing coil to change.

The sensing coil sends the detected magnetic flux periodic change signal to the preamplifier, amplifies and reshapes the signal, generates a pulse signal proportional to the flow rate, and sends it to the unit conversion and flow integration circuit to obtain and display the cumulative flow value. At the same time, the pulse signal is sent to the frequency current conversion circuit, which converts the pulse signal into an analog current quantity, and then indicates the instantaneous flow value.

The round gear transmitter has high machining accuracy and precise installation. The rotation of the gear is scanned non-contact, and each tooth generates a pulse with a very high resolution. Cylindrical gear transmitters can measure very small flow and quantify the small volumes of liquid.

Extended reading: Positive Displacement Flow meter Technology

Helical gear flow meter

PD Flow Meter is referred to as a positive displacement flow meter. Helical Gear-PD Flow Meter is also called, spiral double rotor flowmeter, LLT, LZ double rotor flowmeter, or UF-Ⅱ spiral rotor flowmeter.

As a high-precision flow meter, PD Flow Meter has an accuracy of 0.2 level. It is especially suitable for the measurement of industrial liquids such as crude oil, refined oil, and light hydrocarbons. It is a new generation volumetric flowmeter. Because it uses a pair of spiral rotors with special teeth, it is also called “Helical Gear Flowmeter”.

Extended reading: Flat Pressure Sensor for High Viscosity Fluids

The flow meter is mainly composed of a body, a pair of spiral rotors, a magnetic coupling, a reduction mechanism, an adjusting gear, a counter, and a signaling device.

The number of revolutions of the spiral rotor is transmitted to the meter head counter through a reduction mechanism composed of magnetic coupling and a series of gears.

The magnetic coupling is mainly composed of active magnetic steel and driven magnetic steel. The use of magnetic coupling can increase the working pressure and working temperature of the flowmeter, ensure safe operation, and reduce maintenance work.

Extended Reading: Rotameter vs Flow meter

The measurement chamber mainly has a sealed cavity formed by a pair of special rotors and cover plates as the flow measurement unit.

The rotor is driven by the pressure difference between the inlet and outlet of the flowmeter to rotate, so as to continuously measure the liquid at the inlet to the outlet after being measured in the sealed cavity.

The amount of liquid flowing through each revolution is eight times that of the sealed cavity in the figure. The total number of rotor rotations and the speed of rotation are transmitted to the counting mechanism by the sealed coupling. Then there is pointer display and word wheel accumulation, you can know that it passes through the pipeline Total amount of liquid.

A pulse transmitter can also be installed in the counting mechanism, which becomes a flow meter with a signal.

Matching with the company’s electric display instrument, it can realize remote transmission (quantity, accumulation, instant, and other functions) automatic measurement and control.

Read more about Liquid Flow Meters Guide

Oval gear flow meter

Oval gear flow meter is one of the typical positive displacement flow meters. Measure the flow of liquid filling the pipeline under a certain pressure.

The oval gear flow meter is a pointer display type positive displacement flowmeter. The word wheel accumulates counting and can be equipped with a zero return device. Oval gear flowmeters are widely used in liquid flow control in various industrial fields. Applicable to various types of liquid measurements, such as crude oil, diesel, gasoline, etc. Choose different manufacturing materials, such as crude oil, diesel, gasoline, etc. can be measured.

Extended reading: How to choose a high viscosity flow meter?

The oval gear flowmeter is composed of a metering box and a pair of elliptical gears installed in the metering box, and the upper and lower cover plates form a sealed crescent-shaped cavity (due to the rotation of the gear, it is not sealed) as the calculation unit of a displacement.

The flow meter is mainly composed of a housing, a counter, an elliptical gear, and a coupling (magnetic coupling and axial coupling), etc. As shown in the figure.

1.Counter 2. Transmitter

3. Accuracy adjuster (used above DN50)

4. Sealed coupling

5. Front cover 6. Cover plate

7. Oval gear 8. Shell

9. Rear cover

When the measured liquid enters the flowmeter through the pipeline, the pressure difference generated at the inlet and outlet pushes a pair of gears to continuously rotate, and the liquid measured by the crescent-shaped cavity is continuously transported to the outlet. The product of four times the secondary displacement is the total amount of the measured liquid flow.

The elliptical gear generates a torque to make it rotate under the action of the pressure difference △p of the measured medium.

The rotor 1 and rotor 2 are alternately driven by one to rotate the other. There are two magnets on each rotor as signal generating elements. There is a magnetic signal detecting element at the center of the two axes at the bottom of the cavity. Whenever the magnet turns to the detecting element, the sensor counts as a pulse.

Each pulse corresponds to a certain amount of medium discharge F, F=XXml/p, so the volume flow Qm per unit time can be obtained: Qm=F*H, F is the amount of medium removed by each pulse; H pulse per unit time number.

Read more about Mass Flow Rate vs Volumetric Flow Rate

Explore Oil and Gas Flow Meters

Mirco flow-high viscosity fluid measurement

High-viscosity liquid means that the liquid is viscous and thick, which is different from general liquids and non-Newtonian fluids (mud, pulp). The activity is slow and it is very difficult to filter by simple methods.

What’s more, in addition to some dust, the liquid also contains colloidal particles that are not completely dissolved.

For example solutions such as rubber, paraffin, cellulose acetate, viscose, polyacrylonitrile, paint and animal glue.

Read more about Liquid Flow Meters Guide

Gear flowmeter is a new type of volumetric flow transmitter, used for precise continuous or discontinuous measurement of the flow or instantaneous flow of liquid in the pipeline. Cylindrical gear flowmeter is especially suitable for heavy oil, polyvinyl alcohol, resin and other viscosities. Flow measurement of high media.

It can measure fluids with a viscosity of up to 10000 Pa.s.
The lowest flow rate can be measured at 0.6L/H. That is 0.0026 GPM.
Read more about: what is gpm;

Model

Measure Range

L/H

K

P/L

Pressure-Bar

Temperature

Accuracy

Interface

Installation dimensions

Aluminum alloy

stainless steel

GF02

0.6-50

10500

150

400

-15-80℃

+/- 0.5%

( Range 1:10)

+/- 1.0%    (Range 1:100)

G1/8

Φ84*55

GF04

5-250

9117

150

400

-15-80℃

G1/4

Φ84*55

GF06

10-500

3000

150

400

-15-80℃

G1/4

Φ84*67

GF10

50-1200

1280

150

400

-15-80℃

G1/2

Φ84*67

GF15

200-3000

126.75

150

400

-15-80℃

G3/4

Φ116*98*74

GF25

1000-12000

61.1

150

400

-15-80℃

G1-1/2

158*118*68

GF32

2000-20000

59.9

150

400

-15-80℃

G1-1/2

158*18*68

Extended Reading: Insertion Flowmeter Types

Cylindrical gear flow meters are small in size and light in weight.
During operation, the vibration and noise are small and the operation is stable.
It can also be used to measure the small flow rate of small pipe diameters.
The starting flow is small, and the range ratio is wide, suitable for measuring the liquid flow with large fluctuations.
The measurement accuracy is not affected by changes in pressure and flow, with stable performance, long life and large flow capacity.

Read More about: Chemical Flow Meter Guide

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Sino-Inst, Manufacturer for Gear flow meter for Microflow. For example crude oil flow meter, diesel flow meter, gasoline flow meter.

Sino-Inst’s Gear flow meter for Microflow, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

Contact and Non-contact | Capacitive water level sensor

A capacitive water level sensor is often used to measure the water level of the water storage tank. The capacitive water level sensor uses the change of measuring capacitance value to measure the height of the liquid level. The main function is to continuously measure the liquid level of the measured medium liquid. For example, common media are sewage, mud, paper pulp, eight-treasure porridge, and so on. You may also have heard of a non contact capacitive water level sensor. It is a kind of capacitive water level sensor installed externally.

What is a capacitive liquid level sensor?

The Capacitive liquid level sensor is based on the principle of capacitance sensing. When the height of the measured electrode is changed by the measured medium, it will cause its capacitance to change. It can convert the changes of various material levels and the height of liquid level media into standard current signals, which are remotely transmitted to the operation control room for centralized display, alarm or automatic control by secondary instruments or computer devices.

Capacitive liquid level sensor has a good structure and installation method, which can be applied to high temperature, high pressure, strong corrosion, easy to crystallize, anti-clogging. Anti-freezing and solid powdery and granular materials.

The Capacitive liquid level sensor fundamentally deals with the influence of factors such as temperature, humidity, pressure, and material conductivity on the measurement process. Therefore, it has extremely high anti-interference and reliability. It can measure strong corrosive liquids, such as acid, alkali, salt, sewage, etc.

Can measure high temperature and high pressure medium. Process temperature -40~600℃. Process pressure -0.1~4.0MPa.

A single intelligent integrated capacitance level gauge has common two-point on-site calibration skills, which provides convenience for users to easily use the product.

Capacitive liquid level sensor can measure the liquid level of strongly corrosive medium, measure the liquid level of high temperature medium, measure the liquid level of sealed container. It has nothing to do with the viscosity, density and working pressure of the medium.

Extended reading: Ultrasonic liquid level sensors

Capacitive water level sensor

Can capacitive liquid level sensors measure water?

OK. Because water is conductive. Except for pure water, ultra-pure water, industrial water has no special instructions, it is generally regarded as a conductor.

Capacitive water level sensor is when measuring water. The water contains rust, jelly, etc. Will it cause measurement fluctuations?

probably not. When measuring water, there are two plates: one is the metal rod of the capacitor itself. And the other is actually water. Because general water is conductive. The dielectric is actually the film on the outside of the Capacitive water level sensor metal.

  1. When the tank is a conductor: because water is conductive. Except for pure water, ultrapure water, industrial water without special instructions is generally regarded as a conductor. So it forms the other plate of the capacitor. When the metal tank is used to measure the conductor level with a capacitor, the dielectric is the layer of PTFE.
  2. If the tank body and process connection are non-conductive materials. Then, a conductor should be led down from the ground terminal of the meter casing along the outside of the tank as another plate. The dielectric at this time is membrane + medium + tank wall.

Non contact capacitive water level sensor

Non contact capacitive water level sensor, you only need to attach the sensor to the outer wall of the container made of insulating material when using it.

When the liquid level reaches the sensor detection position, there is a level signal output. It is easy to install and use, no need to open holes, and durable life. Capacitive type can detect the liquid level through the medium. No direct contact with liquid is required. It will not be affected by corrosive effects such as strong acids and alkalis, and it is more hygienic.

Extended reading: Radar Non Contact Water Level Sensor

Features of Non contact capacitive water level sensor:

  1. Small size and high cost performance. Waterproof grade IP62. Ultra low standby function
  2. The liquid level can be detected through the medium without direct contact with the liquid. It will not be affected by corrosive effects such as strong acids and alkalis, and it is more hygienic.
  3. No need to open holes without mechanical parts inside. Only need to be installed on the outer wall of the container to achieve non-contact use
  4. Integrated filtering, debounce, and A/D conversion circuit. Directly output high and low levels.
  5. Accuracy, high reliability, no virtual area, no gray sensing area
  6. Meet the requirements of safety standards
  7. Comply with RoHS requirements
  8. The sensitivity can be matched according to the customer’s application

Non contact capacitive water level sensor application:
It can be used to detect water purification, sewage, oil, wine, various acid-alkaline liquid levels, etc. Mainly suitable for household appliances, medical equipment, chemical equipment, business machines, etc. Your equipment needs level control. Our products will meet your liquid level measurement needs.

Extended reading: Ultrasonic level transmitter for Hazardous Liquids

Compared with non contact capacitive water level sensor and float type liquid level sensor:

  1. It can be used when installed on the outer wall of the container, and the container does not need to be opened. The water level can be detected non-contact.
  2. Small size, small space required for installation
  3. The float type liquid level sensor needs to be in contact with the liquid to detect the liquid level. The internal magnet will adsorb impurities in the water to form scale. Scale will cause the weight of the float to increase and affect the accuracy of liquid level detection. The Non contact capacitive water level sensor does not directly contact the liquid, and there is no such restriction.
  4. The float type liquid level sensor uses the rise and fall of the liquid level to drive the movement of the float with a magnet. So that the internal dry reed switch is turned on and off. Therefore, the float type liquid level sensor has a certain draft, the float is easy to jam, and the reliability is low. The Non contact capacitive water level sensor has no mechanical moving parts and has high reliability.

SI-U01 Float Level Sensor
SI-U02 Multi-Point Liquid Level Float Switch
SI-U03 Float Switch Water Level Controller
SI-U04 Magnetic Float Level Sensor-Reed Switch
SI-U05 Cable Float Level Sensor & Swtich

Frequently
Asked
Questions

  1. Under stable working conditions, due to structural limitations, the compensation problem of system measurement errors caused by the adiabatic temperature of the water side cannot be completely solved. Under accident conditions such as boiler shortage or full water, excessive system measurement errors may bring serious consequences
  2. The structure is complex, and there are many static sealing points. The scale of construction is large and there are problems of heat preservation in winter.
  3. The measurement time lag is long, and the boiler water level change cannot be reflected immediately. The quality of the measurement signal adjustment is poor.
  4. Due to the exothermic heat of the condensing cylinder, the use cost is extremely high.

Extended reading: Amazing Solutions for Continuous Liquid Level Measurement

The capacitance level switch determines whether there is liquid by detecting the conductivity or insulation rate of the medium. It can be simply understood as judging whether the liquid has reached a fixed water level according to the size of the capacitance value. The capacitor is formed between the liquid level switch and the medium in which it is located. When liquid is detected, the capacitance value changes greatly.

Extended reading: Radar Level Sensor Working Principle

More Water level sensors

Water depth sensors are also known as water level sensors. Water depth sensors are often used to measure tank levels, well depths, river depths, etc. There are many different types of water depth sensors. All of them are used to measure the water level by submerging underwater or above the water surface. Then, they are converted into a water depth or water level signal. For example, submersible hydrostatic level meter, ultrasonic level meter, etc.

Extended reading: Non contact level measurement

Sino-Inst offers over 20 Capacitive water level sensors for level measurement.

About 50% of these are liquid level meters, 40% is the tank level sensor.

A wide variety of Capacitive water level sensors options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

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Capacitive Fuel Level Sensor

The capacitive fuel level sensor refers to a capacitive liquid level transmitter used to measure the oil level. According to the principle of capacitance sensing, when the height of the measured electrode dips and changes, the capacitance of the measured electrode changes. It can convert the change of oil level into a standard current signal. It is remotely transmitted to the operation control room for the secondary instrument or computer device for centralized display, alarm, or automatic control.

What is a capacitive liquid level sensor?

The Capacitive liquid level sensor is based on the principle of capacitance sensing. When the height of the measuring electrode changes by the measured medium, the capacitance changes. It can convert the changes of various material levels and the height of liquid level media into standard current signals, which are remotely transmitted to the operation control room for centralized display, alarm or automatic control by secondary instruments or computer devices. Its good structure and installation method can be applied to high temperature, high pressure, strong corrosion, easy crystallization, anti-blocking, anti-freezing, and solid powder and granular materials.

Capacitive liquid level gauges fundamentally deal with the influence of temperature, humidity, pressure, conductivity of materials and other factors on the measurement process. Therefore, it has extremely high anti-interference and reliability. It can measure strong corrosive liquids, such as acid, alkali, salt, sewage, etc. It can measure high temperature and high pressure medium; process temperature -40~600℃; process pressure -0.1~4.0MPa. A single intelligent integrated capacitive liquid level sensor has two common on-site calibration skills, which provides convenience for users to easily use the product.

Sino-Inst’s capacitive liquid level sensor can measure the liquid level of highly corrosive media and the liquid level of high-temperature media. Measuring the liquid level of a sealed container has nothing to do with the viscosity, density, and working pressure of the medium.

Extended reading: Capacitive water level sensor

Extended reading: Oil-water interface measurement-Magtech magnetic level indicator

Capacitive fuel level sensor working principle

Capacitive fuel level sensor is used to measure the change of capacitance to measure the level of the liquid level.

Capacitive fuel level sensor is used to measure the change of capacitance to measure the unevenness of the liquid level. It is a metal rod pierced into the liquid container. The metal rod serves as a pole of the capacitor. The container wall serves as the other pole of the capacitor. The medium between the two electrodes is the liquid and the gas above it.

Because the dielectric constant ε1 of the liquid is different from the dielectric constant ε2 on the liquid surface. For example: ε1>ε2.

Then when the liquid level rises, the total dielectric constant between the two electrodes of the capacitive liquid level gauge increases accordingly, so the capacitance increases.

Conversely, when the liquid level drops, the value of ε decreases, and the capacitance also decreases.

Therefore, the Capacitive fuel level sensor can measure the unevenness of the liquid level by changing the capacitance between the two electrodes.

The sensitivity of the Capacitive fuel level sensor mainly depends on the difference between the two dielectric constants. Moreover, as long as ε1 and ε2 are stable, the liquid level measurement is accurate. Because the measured medium has conductivity. Therefore, the metal rod electrode is covered by an insulating layer. Capacitive fuel level sensor is small in size, and it can easily complete remote transmission and dispatching. Suitable for liquid level measurement of corrosive and high-pressure media.

Extended reading: Oil Level Measurement Solutions for the Oil & Gas Industry

Capacitance level sensor advantages and disadvantages

  1. Simple structure. There are no movable elastic parts. Therefore, the reliability is relatively high and maintenance is minimal. Under normal circumstances, it is not necessary to carry out regular major, medium and minor repairs.
  2. Easy to install. The built-in structure especially shows this characteristic. One person, one wrench. It can be installed in ten minutes.
  3. Easy to adjust. The two potentiometers of zero position and range can perform zero shift or range compression or expansion at will within the effective range of liquid level detection.
  4. Liquid level detection is basically not affected by changes in process conditions. The buoyancy, differential pressure, and isotope level gauges are all related to the gravity of the medium in the detection. Severe changes in the gas-liquid phase medium will cause additional errors in the test results.
  5. Wide application range. Aiming at the specific characteristics of the detected object. Specially customized. It can be adapted to liquid level detection under a variety of harsh conditions.
  6. Low operating cost, no additional impact, no vulnerable, consumable parts, and no additional issues such as depreciation costs for radioactive sources, disposal costs for waste sources, and radiation protection compared with isotope level gauges.
  7. Lightweight. A high-pressure liquid level gauge that works at 32MPa at the same time weighs less than two kilograms. It is a few tenths of the weight of the high-pressure float level gauge.

Extended Reading: GWR Level Sensor for High Temperature & High Pressure

  1. This level is not suitable for the detection of highly viscous media, such as molten asphalt.
  2. The stainless steel process connection part at the lower part of the housing or junction box. It must be reliably connected to the outer wall of the container (grounded). Its contact resistance cannot be greater than 2.
  3. In normal operation, the probe line cannot have a large swing amplitude in the container. Otherwise, the signal will be unstable.

Extended reading: Diesel fuel tank level gauges & indicators

Capacitive fuel tank level sensor Applications

This series of level gauges have been successfully used in the following occasions:

  • Chemical plant: detect the liquid level of chemical raw materials such as polyester, spandex, acid, alkali, etc.
  • Environmental protection: detection of sewage level
  • Boiler factory: detect the level of the medium in the pressure vessel
  • Hydraulic machinery: detection of lubricating oil level
  • Food department: check the level of edible oil
  • Oilfield: Detect the level of refined oil

Learn more about Diesel fuel tank level gauges & Indicators

Cryogenic Level Sensor for Liquid Nitrogen Tank Level Indicator

The Cryogenic Level Sensor is a capacitance-based level transmitter for cryogenic liquid level measurement. Cryogenic Level Sensor is a customized product for liquid level measurement in low temperature environments such as liquid nitrogen, LNG, and liquid ammonia. Also called liquid nitrogen level sensor. This product has no moving parts and is not disturbed by the external environment. It has the advantages of long-term operation, high sensitivity, good linearity, low temperature resistance, etc. The cryogenic level sensor provides a variety of output signals. It is used in LNG liquid natural gas, petroleum, chemical industry, metallurgy, electric power, papermaking, pharmaceutical and other fields.

Extended reading: liquid nitrogen level measurement

More Featured Fuel Level Sensors

More liquid level measurement solutions

Laser Level Transmitter

What is a laser level transmitter? A laser level transmitter is also called a laser level…

Extended reading: Radar Oil Tank Level Sensor

Sino-Inst is Manufacturer of Capacitive Fuel Level Sensors for oil/fuel/diesel Tank Level Indicator. We supply more than 10 kinds of fuel level measure instruments.

Capacitive Fuel Level Sensors are mainly used for level measurement of Industrial Oil Storage Tanks.
It can measure even for accurate measurement of oil level in car fuel tanks, tankers, oil depots, etc.

Capacitive Fuel Level Sensors enable stable level measurement. This greatly meets the measurement needs of many applications. Can be used from small to large tanks.

Extended reading: ultrasonic level sensor for diesel tank

Sino-Inst’s Capacitive Fuel Level Sensors, made in China, Having good Quality, With better price. Our level measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

The entire team at Sino-Inst’s has received excellent training, so we can ensure that every client’s needs are met. For assistance with your product requirements, whether it’s a Capacitive Fuel Level Sensors, flow sensor, or other device, give us a call.

Food Grade Flow Meters for Food & Beverage Industry

In the food and beverage industry, automation equipment requires food grade. Ensure hygiene and safety. The food grade flow meter can easily sterilize the equipment without disassembly. Many of the flowmeters we provide use accessories such as triple clamps, clover, and 3A pipe fittings. These fittings are sanitary food-grade fittings for stainless steel clamp pipe joints.

Flow measurement in the food industry

In the food and beverage processing industry, accurate measurement and control of raw materials are very demanding. Food grade flow meters Cut costs and increase productivity. Certain processes in the food industry require sanitary conditions. Food industry: dairy products, alcohol, beverages, syrup, chocolate, edible oil, etc.

Food grade oil flow meter

Food grade flow meters can measure edible oil.

There are many steps in the processing of edible oil that require a flow meter to measure the volume and weight of how much oil flows out of the pipeline. Companies that produce and process edible oils need to use flow meters for statistics on the crude oil that is initially refined and the essential oil that is finally refined.

First of all, for oil measurement, electromagnetic flowmeters cannot be selected.

You can choose turbine flowmeters, gear flowmeters, ultrasonic flowmeters, metal rotor flowmeters to measure oil. If you need high-precision measurement. You can also consider mass flow meters.

Extended reading: Sanitary Positive Displacement Flow Meter

Flowmeter used in the beverage industry

An electromagnetic flowmeter is used to measure the volume flow of conductive liquid medium with conductivity greater than 5μs/cm. Electromagnetic flowmeters are usually used to measure the flow of large pipelines. It can be accurately measured in a large beverage production workshop. The minimum diameter of the current electromagnetic flowmeter is 0.1 inches, that is, 2.5 mm, and the maximum diameter can reach nearly 3 meters.

The beverage industry includes beer, fruit juice, etc., and electromagnetic flowmeters could not be better. Generally, the medium is conductive, and it is very good to add ions appropriately. And there is no loss. There is no differential pressure loss or something.

Originally, there are still many ways to protect the electrodes of the electromagnetic flowmeter. We should pay more attention to it in the process of use. Don’t cause the electromagnetic flowmeter to fail to operate normally in the future due to a little negligence.

Flow measurement in Breweries

What kind of flowmeter can be used to solve beer flow measurement? Beer is a conductive medium. Can use electromagnetic flowmeter to measure. When measuring beer, you only need to use stainless steel electrodes and tetrafluoroethylene lining. The electromagnetic flowmeter is a measuring instrument with high measurement accuracy and good stability. It has been widely used in beer flow measurement.

Beer flow measurement. Let’s take a look at how to select a beer electromagnetic flowmeter:

  1. Medium
  2. Temperature
  3. Pressure

When measuring beer flow, you can select according to the above three corresponding parameters to meet the on-site measurement requirements.

Of course, except for electromagnetic flowmeters. The sanitary turbine flowmeter can also be used to measure beer or liquor.

Extended reading: Stainless steel flow meters|304-316 optional

Syrup flow measurement

Food grade flow meters can measure syrup.

High viscosity syrup flow measurement

If the viscosity of the measured syrup is relatively high. Then I recommend using a target flowmeter or an oval gear flowmeter.

The target flow meter is a speed meter. It calculates the flow rate of the medium according to the force of the medium pushing the target. Its intelligent liquid crystal meter head can clearly display the instantaneous flow and cumulative flow of the medium. And output 4-20mA signal. The installation is simple and the maintenance is small. High temperature and high-pressure resistance. Suitable for large, medium, and small pipe diameters. The application range is very wide.

The oval gear flowmeter is a positive displacement flowmeter. It is a mechanical instrument. He calculates the medium flow rate based on the measurement of the rotation of the internal gear. The general configuration is a pointer display type, which only displays the cumulative flow and does not display the instantaneous flow. Therefore, the user needs to explain to the manufacturer when displaying the instantaneous flow rate. The manufacturer will be equipped with a smart meter.

In addition, the output signal is a pulse signal. The user needs a 4-20 mA signal, and the manufacturer also needs to explain it to the manufacturer. Oval gears are relatively bulky. Therefore, it is not suitable for the measurement of large-diameter pipes. Its largest caliber is also smart to 200mm.

Why Generally Choose 4-20ma Output?

In addition to the above two types of vortex, flowmeters are also possible.

Low viscosity syrup flow measurement

If the measured viscosity of the syrup is not very high, an electromagnetic flowmeter or a liquid turbine flowmeter has been used.

Electromagnetic flowmeters are mainly used for the measurement of medicines such as glucose syrup and food syrup. Because medicine and food have higher hygiene requirements. Strict disinfection is required, so clamp-type electromagnetic flowmeters are generally used.

The liquid turbine flowmeter measures low viscosity, and the effect of relatively pure syrup is very good. Responsive, high precision, beautiful and light appearance, installation and maintenance are also very simple. It is suitable for the measurement of small and medium pipelines. Both types of flow meters are smart meters. On-site LCD displays instantaneous flow and cumulative flow. Output 4-20mA signal. The scope of application is also very wide.

Here I simply recommend several flow meters based on the viscosity of the syrup. How to choose specifically. Users need to provide relevant parameters and requirements to make the most suitable and correct choice.

Extended reading: Sludge flow meter for sewage treatment return activated sludge system

Featured Food grade flow meters

Food grade positive displacement flow meter

Positive displacement flow meters, also known as fixed displacement flow meters or PD flow meters, are the most accurate measuring instruments. The oval gear flowmeter is the most typical positive displacement flowmeter.

According to the measuring elements, the volumetric flow plan can be divided into elliptical gear flow meters, double rotor flow meters, disc flow meters, rotary piston flow meters, wet gas meters, and membrane gas meters, etc. The clamp connection oval gear flowmeter has the advantages of a lightweight and convenient connection. Especially in the chemical and pharmaceutical industries, it has a wide range of uses.

Extended reading: Mechanical flow meter types

Gas Rotameter Tips

What is Gas Rotameter? Rotameter is also called float flowmeter. It is often called glass tube…

Solid Flow Meter

What Is a Solid Flow Meter? The solid flow meter is suitable for the measurement of…

FAQ

The solid flow meter is suitable for the measurement of solid mass flow in a wide range of metal-enclosed pipelines from kg/h to t/h. The system is suitable for online monitoring of the flow of solids such as powder, dust, pellets, granules, etc., which are pneumatically conveyed or in free fall (1nm-20mm).

Solid flow meters are also called solid powder flow meters, intelligent electrostatic powder flow meters, solid dust flow meters, coal powder flow meters, mineral powder flow meters, lime flow meters, cement flow meters, flour flow meters, petroleum coke powder flow meters.

Extended Reading: Insertion Flowmeter Types

The price of a flowmeter is determined by the type and parameters of the flowmeter.

Important factors when selecting flow metering devices are

  • accuracy
  • cost
  • legal constraints
  • flow rate range
  • head loss
  • operating requirements
  • maintenance
  • lifetime

These factors are more or less related to each other. For example – the cost of flow meters increases with accuracy and lifetime quality.


Water flow meters are flow meters that can display the flow rate of industrial water pipes.

A water flow meter measures the amount of water flowing through a pipe. We have several kinds to choose from, depending on the application, maintenance needs, and budget.

There are four common water flow meter types:

Turbine (also called mechanical), Vortex, Ultrasonic, and Magnetic. We will tell you everything you need to know about them and help you choose one for your application.

Extended reading: Ultrasonic Flow Meters Types & Technical Guide

Different manufacturers and different models have different accuracy levels.
The accuracy of general flow meters is divided into 0.1, 0.2, 0.5, 1.
Mass flow meters can reach even higher accuracy levels.
Common flow meters can achieve 1 or 0.5.

Extended reading: Gas Rotameter Tips

Extended reading: Metal Tube Flow Meter-Variable Area Flow Meters Principle

In general, the principle of selecting a flow meter is to first have a deep understanding of the structural principles and fluid characteristics of various flow meters. At the same time, the selection should be made according to the specific situation of the site and the surrounding environmental conditions. Economic factors must also be taken into consideration.

In general, you should choose from the following five aspects:

  • The performance requirements of the flowmeter;
  • Fluid characteristics
  • Installation requirements;
  • Environmental conditions
  • The price of the flow meter.

Read more about: Coriolis meter for High viscosity liquid

Still have questions?

If you cannot find an answer to your question in our FAQ, you can always contact us
and we will be with you shortly.

Sino-Inst offers over 10 Food grade flow meters, with the Best Price. Food grade flow meters are Also called sanitary flowmeters.

A wide variety of Food grade flow meters options are available to you, such as free samples, paid samples.

About 13% of these are magnetic flow meter, 14% are Turbine Flow Meters, 25% are Venturi flow meter, 13% are Handheld ultrasonic flow meter, and others are Liquid mass Flow Meters.

Sino-Inst is Food grade flow meters supplier, located in China. Food grade flow meters products are most popular in North America, Mid East, and Eastern Europe. The United States, and India, which export 99%, 1%, and 1% of Food grade flow meters respectively.

Gas Rotameter Tips

What is Gas Rotameter?

Rotameter is also called float flowmeter. It is often called glass tube float flowmeter, glass rotameter, metal rotameter, and metal tube float flowmeter.
Rotameter is mainly used to measure the flow of single-phase non-pulsating fluid (gas or liquid). When gas or liquid is introduced into a uniform conical flow tube. The float rises. Its weight is supported by the fluid flowing below. Until the entire fluid volume is available Flow through the float. The position of the float corresponds to a point on the pipe measurement scale and provides an indication of the fluid flow rate.

Can rotameter be used for gases?

Rotameter can measure gas.

Rotameter is a variable area flow measuring instrument commonly used in industrial automation process control, which can be used to measure the flow of liquid, gas, and steam.

Rotameters are especially suitable for dry gas and steam measurement. Such as the measurement of nitrogen, air, oxygen and other gases.

It is not applicable if the liquid medium or gas medium contains impurity particles. It will affect the accuracy of the measurement.

If the pressure is relatively large, you can use a metal tube float flowmeter. The metal tube float flowmeter can transmit signals remotely for total accumulation or flow control. You can also customize the remote metal rotor flowmeter according to your needs. Explosion-proof metal rotor flowmeter.

Further reading: Nitrogen(N2) Flow Meter Types

More Featured Gas meters:

Extended reading: Beginner’s Guide: Variable area flow meter

Air Rotameter

Metal tube rotameter can be used to measure air. Because the rotameter is a variable area flow measuring instrument commonly used in industrial process automation control.

Rotameter has the characteristics of small size, large detection range and convenient use. It can be used to measure the flow of liquid, gas and steam. It is especially suitable for medium flow measurement with low flow velocity and small flow. Therefore, there is no problem in measuring air. However, it should be noted that the metal tube rotor flowmeter is only suitable for the flow measurement of small-diameter and low-velocity media within DN200.

Extended Reading: Digital air flow meters

Rotameter is a variable area flow measuring instrument commonly used in industrial automation process control. It is mainly to measure the instantaneous flow of various liquid gases and steam under different working conditions. You can directly observe the value under the flow state of the medium. It can easily solve the problem of fluid flow measurement under various working conditions.

The metal rotor flowmeter has the characteristics of simple structure, large detection range, high temperature and high-pressure resistance, anti-corrosion, and explosion-proof. It has a wide range of applications in petroleum, chemical, metallurgy, electric power, medicine, food, sewage treatment, and other industries.

Read More about: Digital Rotameter

The common accuracy of the rotameter is 1.5. This accuracy has been able to meet the measurement needs of most users.

Extended reading: Buy Digital Gas Flow Meters & Controllers For Air-O2-N2-CO2

Yes. Rotameter can Be Used for Gases.

Rotameter is the most widely used variable area flowmeter type. Rotameters are called gravity flowmeters because they are based on the opposition between the downward force of gravity and the upward force of the flowing fluid.

When the flow is constant, the float stays at a position related to the volume flow. The position is indicated by a scale. Please note that in order to maintain the full effect of gravity, this dynamic balancing action requires a vertical measuring tube.

Other forms of gravity meters may include a piston or vane that responds to flow in a manner similar to the behavior of a float. All these devices can be used to measure the flow of most liquids, gases, and steam.

There are similar types that use springs instead of gravity to balance fluid flow. These do not need to be installed vertically, but corrosive or aggressive fluids can damage the spring and cause reduced accuracy.

Extended Reading: What is difference between rotameter and flow meter

Rotameters are generally divided into three categories: plastic rotameters, glass rotameters and metal rotameters according to the material of the tapered tube.

  • The former two are generally in-situ indicating type, and the latter is generally made into a flow transmitter.
  • According to different converters, metal rotor flowmeters can be divided into gas remote transmission, electrical remote transmission, indication type, alarm type, and integrated calculation.
  • According to the structure and purpose of the transmitter, it can be divided into basic type, jacket insulation type, anti-corrosion type, high temperature type, high pressure type and so on.

Extended reading: What is an air pressure transducer?

More about Types Of Air Flow Measurement Instruments.

Chlorine Gas Rotameter

Rotameters are used to measure the flow of various small-diameter media. Of course, it is also very reliable when used in the chlorine flow measurement industry.

For the measurement of chlorine gas, the metal tube rotameter can fully meet this measurement requirement. Rotameters are not only made of metal, but also made of glass.

Comparing the two, the metal tube rotor flowmeter has on-site display and intelligent remote transmission functions. The measurement accuracy is high and it is easy to use. And the whole is relatively sturdy and has a long service life.

The glass tube rotameter has a simple structure. There should be no bumps during use. It is fragile and non-explosive, and has a short service life. The metal tube rotameter is superior to the glass tube rotameter when measuring chlorine.

Extended reading: Gas Mass Flow Meter

The flow meters that can be used to measure chlorine are: rotameter, vortex flowmeter, differential pressure flowmeter, gas mass flowmeter, etc. Since chlorine is very corrosive, especially when there is moisture, it is necessary to consider anti-corrosion treatment.

Nitrogen Gas Rotameter

There are many types of Nitrogen gas flow meters. There are three types of flow meters commonly used to measure nitrogen. Precession vortex flowmeter, gas vortex flowmeter, thermal gas mass flowmeter. When selecting a model, it is necessary to select a suitable model and specification according to the parameters and cost that can be provided on-site.

Of course, the rotameter is also a good choice for measuring nitrogen. Because of the low cost.

Read more anout: Nitrogen Gas-Liquid Nitrogen Flowmeters

Hydrogen Gas Rotameter

There are three types of flowmeters commonly used to measure hydrogen flow: precession vortex flowmeter, gas vortex flowmeter, and thermal gas mass flowmeter. When selecting a model, it is necessary to select a suitable model and specification according to the parameters and cost that can be provided on site. You must communicate well with the sales staff to make the measurement accurate.

Of course, the rotameter is also a good choice for hydrogen measurement. Because of the low cost.

Extended reading: Featured Hydrogen flow meters

Natural Gas Rotameter

The flow measurement of natural gas is currently mainly used in trade settlement and is relatively common. my country’s natural gas trade measurement is based on the volume or energy method under the legally required quality indicators for transfer measurement. At this stage, volume measurement is basically the main method.

At present, the flowmeter products used for natural gas flow measurement generally include: gas waist wheel flowmeter, gas turbine flowmeter, precession vortex flowmeter, vortex flowmeter, ultrasonic flowmeter and orifice flowmeter.

Let’s make a simple comparison on the use of these flow meters.

Extended reading: 5 matters to pay attention to when choosing threaded Vortex Nitrogen Gas Flow Meter

Rotameter Gas Flow Conversion

When measuring gas and liquid media, are the parameters of the rotameter the same?

Metal rotor flowmeter is a variable area flow measuring instrument commonly used in industrial automation process control. When it is measuring liquid and gaseous media, because the density of the two media is different, the material of the rotor of the flowmeter will also be different due to the density of the medium.

Regardless of whether it is measuring gas or liquid, the metal rotor flowmeter is the same in appearance and structure. But because the density of a gas is lower than that of liquid, the density of gas rotor material is smaller than that of the liquid rotor.

Whether the rotameter for measuring gas or liquid, the structure is basically the same, and it is equipped with a rotor in a conical tube. The main differences are as follows:

  1. The calculated density of the rotor: the density for liquid is high, and the density for gas is low.
  2. Rotor shape: the cross-sectional area of ​​liquid is relatively small, and the cross-sectional area of ​​gas is relatively large
  3. Damping device: It is better to use a damping device for liquids and gas, so that the measured value is stable.

Therefore, when we choose the metal rotor flowmeter, we need to clearly describe the real-time conditions of the working conditions with the manufacturer. In this way, we can formulate qualified process and technical parameter models of flowmeters according to the actual requirements of the working conditions. So as to be able to solve the measurement problem more effectively.

Extended reading: Radar level sensor for solids – Dust solid level measurement

Gas Rotameter Calibration

It is not feasible to calibrate metal tube rotameters with conventional methods. This is determined by the structural principle of the transmitter.
Because the rotameter is between the input pressure source and the generated 4-20mA current signal. Besides to machinery and circuits. There are also micro-processing chips that perform calculations on input data. Therefore, the adjustment is different from the conventional method.

In fact, the manufacturer also has instructions on the calibration of metal tube rotameters. A series of transmitters produced by our company. For calibration, there are: “Set range”, “Re-quantity range”, “Fine adjustment” points.

Extended reading: liquid nitrogen level measurement

Among them, the “set range” operation is mainly to complete the configuration work through the number of LRV and URV. The “re-quantity range” operation requires the transmitter to be connected to a standard pressure source. Guided by a series of instructions, the transmitter directly senses the actual pressure and sets the value. The initial and final settings of the range directly depend on the actual pressure input value. But it should be seen that although the analog output of the transmitter has a correct relationship with the input value used. But, the value displayed by the digital readout of the process value will be slightly different. This can be calibrated by fine-tuning items.

Because each part of the metal tube rotor flowmeter needs to be adjusted separately and must be adjusted together. Therefore, the actual calibration can be carried out according to the following steps:

Make a 4-20mA fine-tuning first. It is used to calibrate the D/A converter inside the transmitter. Because it does not involve sensing components.

No external pressure signal source is required.

Do one more full fine-tuning. Make the 4-20mA and digital readings coincide with the actual applied pressure signal. Therefore, a pressure signal source is required.

Finally, do the re-quantification process. Adjust the analog output 4-20mA to match the external pressure signal source. Its function is exactly the same as that of the zero adjustment (Z) and range adjustment (R) switches on the transmitter housing.

Some people think that the range of metal tube rotameter can be changed as long as the HART handheld communicator is used. And can adjust the zero point and span. There is no need to enter a pressure source. But this approach cannot be called calibration, but can only be called “setting range”.

The real calibration requires a standard pressure source to enter the transmitter. The range adjustment (LRV, URV) is not calibration because the standard instrument is not used. Ignore the input part (pressure of the input transmitter) to adjust the output, (transmitter conversion circuit) is not a correct calibration.

Furthermore. The relationship between pressure and differential pressure detection components. A/D conversion circuit. And current output is not equal. The purpose of calibration is to find out the relationship between the three changes.

Extended reading: Cryogenic Flow Meters | Liquid Nitrogen-Liquid Oxygen

Metal Tube Rotameter

Metal tube rotameter with transmitter Metal tube rotameter with the transmitter is also called digital rotameter…

Extended reading: How does a rotameter work

Sino-Inst offers over 30 rotameter products. About 50% of these are for liquids. 40% are for gas. At the best price.

A wide variety of Gas Rotameter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Gas Rotameters, located in China.

The top supplying country is China (Mainland), which supply 100% of the Float Flow Meter respectively.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Gas Rotameter products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Float Flow Meter Technology

What is a float flow meter?

The float flow meter is also called a rotameter. The float flow meter is a volumetric flow meter in which a float rises and falls in a vertical tapered tube as the flow changes, changing the flow area between them. It is often called Variable Area Flowmeter or Area Flowmeter in the United States and Japan. The float flow meter can be used to measure the flow of liquid, gas, and steam. It is especially suitable for medium flow measurement under low flow rates and small flow conditions.

How does a float flow meter work?

Float Flow Meter is also called rotor flow meter. It is mainly used for small and medium caliber flow measurement. It can measure liquid, gas, steam, etc. The product series have complete specifications and are widely used.

Extended reading: Gas Rotameter Tips

Float Flow Meter working principle

Float Flow Meter consists of two parts. One of the rotameter is a tapered tube that gradually expands from bottom to top. The other is a rotor that is placed in the tapered tube and can move freely up and down along the centerline of the tube.

When measuring the flow of fluid, the measured fluid flows in from the lower end of the tapered tube. The flow of fluid impacts the rotor and produces a force on it. The magnitude of this force varies with the flow rate.

When the flow is large enough, the generated force will lift the rotor and raise it.

Extended reading: Fluid flow meter types

At the same time, the measured fluid flows through the annular section between the rotor and the tapered tube wall. At this time, there are three forces acting on the rotor. The dynamic pressure of the fluid on the rotor, the buoyancy of the rotor in the fluid, and the gravity of the rotor itself.

When the flowmeter is installed vertically, the center of gravity of the rotor coincides with the axis of the tapered tube. The three forces acting on the rotor are all along the direction parallel to the axis of the tube.

When these three forces reach a balance, the rotor floats smoothly on a certain position in the cone tube.

For a given rotameter, the size and shape of the rotor have been determined. Therefore, its buoyancy in the fluid and its own gravity is known to be constant. Only the dynamic pressure of the fluid on the float changes with the flow rate of the incoming flow.

Therefore, when the flow rate of the incoming flow becomes larger or smaller, the rotor will move up or down. The flow cross-sectional area of ​​the corresponding position also changes. Until the flow rate becomes the corresponding speed when the flow rate becomes balanced, the rotor is stable in the new position.

For a given rotameter, the position of the rotor in the cone tube is in one-to-one correspondence with the flow rate of the fluid flowing through the cone tube.

In order to prevent the rotor from touching the tube wall when moving up and down on the centerline of the tapered tube, two methods are usually used.

One is to install a guide mandrel in the center of the rotor to keep the rotor moving up and down on the centerline of the tapered tube.

The other is a chute on the edge of the rotor disc. When the fluid flows through the rotor from bottom to top, one side bypasses the rotor. At the same time, it passes through the chute to generate a reverse thrust. The rotor keeps rotating around the centerline. . It can keep the rotor from touching the pipe wall when working. The rotor material of the rotameter can be made of stainless steel, aluminum, bronze, etc.

Extended reading: Micro flow meters for low flow liquids

Types of Float Flow Meter-variable area flowmeter

It can be divided into transparent material cone tubes and metal cone tubes.

  1. Transparent conical tube float flow meter

Transparent tapered tube materials include glass tubes, transparent engineering plastics such as polystyrene, polycarbonate, plexiglass, etc. Among them, glass pipes are most used, but they are easy to break. Engineering plastic pipes are not easy to break. Some are also resistant to corrosion by corrosive media such as acid and alkali.

The diameter of the transparent tapered tube float flow meter is 15~40mm, and the flow index is directly engraved on the outer wall of the tapered tube. Or an indexing scale is installed beside the tapered tube. The tapered tube has a cone smooth surface and a guiding rib (or flat surface). ) Two kinds.

The float moves freely in the tapered tube or moves under the guidance of the tapered tube ribs. The instrument on the inner wall of the large smooth surface is also guided by a guide rod.

Extended Reading: What is difference between rotameter and flow meter

  1. Metal Conical Tube Float Flow meter

The diameter of the metal tube conical tube float flow meter is 15~40mm, and the displacement of the float is transmitted to the conversion part outside the casing by means of magnetic steel coupling. Compared with transparent conical tube float flow meter. It can be used for higher medium temperature and pressure. And it is not easy to break.

Extended reading: Metal Tube Flow Meter-Variable Area Flow Meters Principle

There are several other structures of the transparent float flow meter. For example, the transparent straight tube float flowmeter is a deformed structure of the transparent conical tube float flow meter. The flow detection element is composed of an orifice plate and a cone floating plug.

There are other types of deformed structures of the metal tube conical tube float flowmeter. Among them, the direct indication type directly observes and reads the position of the float through the transparent straight pipe and the floating plug.

The horizontal installation type can be installed in the horizontal pipeline; the straight-through type has a different right-angle flow direction from the typical structure. It is not necessary to change the flow direction. It can be directly connected to the vertical pipeline. Easy to install.

The floating plug orifice plate type replaces the rotor tapered tube with a floating plug orifice plate. It is more convenient to change the flow specification as long as the floating plug with a different taper is changed.

Extended Reading: Magnetic Battery Operated Flow Meter

It can be divided into on-site instructions, pneumatic remote signal output, electric remote signal output, alarm, etc. Transparent tube float flowmeters are all on-site indication types.

Sometimes a proximity switch is installed to output upper and lower limit alarm signals.

The conversion part of the remote signal output instrument converts the displacement of the float into an analog signal output of current or air pressure. Respectively become air remote transfer float flowmeter and electric remote transfer float flowmeter.

Read More about: Digital Rotameter

It can be divided into hose connection, flange connection, and threaded connection.

There are three connection methods for the transparent tube float flowmeter.

Among them, hose connection is often used for instruments with a diameter of less than 10mm and places with low working pressure.

The threaded connection is often used for instruments with a diameter below 40mm. The scope of application is not wide.

Flange connection is used for instruments with a diameter of 15~100mm, and the application is the most common.

Metal tube float flowmeters are usually flanged, and individual models are connected by a thread.

It can be divided into liquid, gas, and steam.

Most float flow meters can measure both liquid and gas in the same instrument.

Only specially designed metal tube float flowmeters can be used to measure steam. Or add additional components to the standard instrument. Such as adding liquid damping parts with fins. Install heat sinks at the junction with the indicating conversion part.

Extended Reading: Insertion Flowmeter Types

It can be divided into basic types, jacket insulation types, explosion-proof types, corrosion-resistant types, and blowing types. The basic type is the most widely used.

Jacket insulation type is used for occasions where the temperature in the pipeline is significantly higher (or lower) than the ambient temperature.

When used in explosive gas or dust, the electric remote float flowmeter adopts an explosion-proof type. At present, there are explosion-proof design structures and intrinsically safe explosion-proof design structures in China.

Corrosion-resistant float flowmeters are made of engineering plastics such as polytetrafluoroethylene, etc., for the structural parts and float in contact with the medium.

The flow rate of the blowing type is small, the air is 20~3000L/h, and the water is 0.3~100L/h, and the accuracy requirements are not high.

The blow-flow type float flowmeter is integrated with a small self-operated differential pressure regulator. The flow change is caused by the pressure fluctuation of the power source or the disturbance of the downstream parameter change. Self-adjustment to maintain a constant flow rate.

It can be divided into full flow type and split flow type.

The full-flow type refers to the instrument in which all the fluid to be measured flows through the float flowmeter.

The shunt type means that only part of the measured fluid flows through the flow detection part such as the float. The shunt-type float flowmeter is a combination of a standard orifice plate installed on the main pipe and a smaller diameter float flowmeter. It is used for larger flow rates with pipe diameters greater than 50mm. And as long as the place indicated on the spot.

Float type water flow meter

Rotameters can be used to measure the instantaneous flow of water. There are many flow meters for measuring water. Almost all flow meters that measure liquids can be used to measure water.

The original rotameter used to measure water is now used to measure the flow rate of gasoline. Is the reading correct?

Certainly not. Rotameter measuring liquid is most affected by liquid density and viscosity. It is recommended to find the manufacturer to tell them the parameters of your gasoline. It should be able to help you convert and tell you the true flow rate when the current scale is used to measure gasoline.

Rotameters measure different liquids. How to convert?

Rotameter display value correction. The fluid and state when the flowmeter is in use are generally different from the fluid and state when the flowmeter is scaled. Therefore, the value of the flow meter reading during use is not the real flow through the flow meter. The indicated value must be corrected according to the fluid and state in use. In order to get the correct flow.

The flow meter produced by Sino-Inst is calibrated with water for measuring liquid. The flowmeter for measuring gas is calibrated with air. The indicated value is scaled according to the volume flow rate of the standard state (water at 20°C; air at 20°C, 101.325KPa). Therefore, all corrections are based on the standard state index.

Extended reading: Beginner’s Guide: Variable area flow meter

More Featured Water Flow Meters:

Float air flow meter

Metal tube rotameter can be used to measure air. Because rotameter is a kind of variable area flow measuring instrument commonly used in industrial process automation control.

It has the characteristics of small size, large detection range, and convenient use.

It can be used to measure the flow of liquid, gas and steam. It is especially suitable for medium flow measurement with low flow rate and small flow, so there is no problem in measuring air.

However, it should be noted that the metal tube rotor flowmeter is only suitable for the flow measurement of small-diameter and low-velocity media within DN200.

More Featured air flow meters:

Frequently
Asked
Questions

Rotameter is a kind of variable area flowmeter. The working principle of the rotameter is in a vertical cone tube that expands from bottom to top. The gravity of the float of the circular cross-section is borne by the hydrodynamic force. The float can be in the cone The tube rises and falls freely. It moves up and down under the action of flow velocity and buoyancy. After being balanced with the weight of the float, it is transmitted to the dial to indicate the flow through the magnetic coupling.

The rotameter consists of two parts. One of the rotameter is a tapered tube that gradually expands from bottom to top. The other is a rotor that is placed in the tapered tube and can move freely up and down along the centerline of the tube.

When measuring the flow of fluid, the measured fluid flows in from the lower end of the conical tube. The flow of fluid impacts the rotor and produces a force on it. The magnitude of this force varies with the flow rate). When the flow rate is large enough At this time, the force generated will hold up the rotor and raise it.

The accuracy of the conventional model of the rotameter is 1.5. This accuracy is not the highest. But it has been able to meet the measurement needs of most users.

Extended reading: Integral DP Flow Meter|Gas, liquid, steam|Compact structure

Sino-Inst offers over 30 Float Flow Meter products. About 50% of these are for liquids. 40% are for gas. At the best price.

A wide variety of Float Flow Meter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Rotameter flow meters, located in China.

The top supplying country is China (Mainland), which supply 100% of the Float Flow Meter respectively.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Float Flow Meter products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Metal Tube Rotameter

The Metal Tube Rotameter uses the variable area measurement principle. The intelligent metal tube float flowmeter has a local display type and an intelligent remote transmission type, with the transmitter. Metal Tube Rotameter can be used to measure the flow of liquid, gas, and steam. It is especially suitable for medium flow measurement with a low flow rate and small flow.

Metal tube rotameter with transmitter

Metal tube rotameter with the transmitter is also called digital rotameter. All-metal structure, there are indicator type, electric remote transmission type, corrosion-resistant type, high voltage type, jacket type, explosion-proof type.

Electric remote transmission, explosion-proof design. Explosion-proof mark Exd Ⅱ CT6. Optional HART protocol function. DC24V power supply, the on-site pointer indicates instantaneous flow. Digital display instantaneous and cumulative flow. Two-wire system 4~20mA output. There are 4 buttons on the panel to view and modify internal parameters.

Metal tube rotameter Features

  • Suitable for flow measurement of small-diameter and low-velocity media;
  • Reliable work. Low maintenance and long life;
  • The requirements for straight pipe sections are not high;
  • Wider flow ratio 10:1;
  • Two-line large LCD display. Optional on-site instantaneous/cumulative flow display. Single-axis sensitive indication with backlight;
  • Non-contact magnetic coupling transmission.
  • All metal structure, metal tube rotor flowmeter is suitable for high temperature, high pressure and strong corrosive media;
  • It can be used in flammable and explosive hazardous situations;
  • Optional two-wire system, battery, AC power supply mode;
  • Multi-parameter calibration function. With data recovery, data backup and power failure protection functions.

Extended Reading: What is difference between rotameter and flow meter

Metal tube rotameter Specifications

PerformanceTechnical parameter
Measurement rangeWater (2.5~150000) L/h; air (0.07~2000) m3/h (at 0.101325 Mpa, 20℃).
level of accuracy1.5 and 2.5 grades (PTFE).
Turndown ratio10:1 or special 5:1
Nominal pressureDN15~50≤4.0MPa; DN65~150 ≤1.6MPa.
Medium temperature-80℃~200℃ (with F46 flowmeter lining 0℃~80℃)
Liquid medium viscosityDN15<5mPa•s; DN25~150≤250mPa•s
Output4-20mA two-wire system
Pure resistive load<680Ω
Linearity<0.5%
Temperature effect<5MA/K
Ambient temperature-25℃~55℃
total heightDN15~DN150 (generally 250mm)

Extended reading: Sludge flow meter for sewage treatment return activated sludge system

The metal tube float flowmeter is mainly composed of two parts: the measuring tube and the indicator. The measuring tube includes a conical tube or orifice, guide, stopper, float, and other components. The indicator includes a magnetic follower system, pointer, dial, circuit, and other components.

The measured medium flows through the measuring tube from bottom to top. The upper and lower ends of the float generate differential pressure to form a rising force. When the rising force of the float is greater than the weight of the float immersed in the flowing fluid, the float rises, and the annular gap area increases. Annular gap When the fluid velocity drops rapidly, the differential pressure at the upper and lower ends of the float decreases. The ascending force acting on the float decreases. Until the ascending force balances with the weight of the float immersed in the fluid, the float stabilizes at a certain position. The height of the float is that Corresponds to the size of the measured medium flow.

The float has built-in magnetic steel. When the float moves up and down with the medium, the magnetic field changes with the movement of the float.

a. For the in-situ type, the follow-up magnet in the in-situ indicator is coupled with the magnet in the float. It rotates and drives the pointer at the same time, and the current flow rate is indicated by the dial.

b. For the smart type, the follower magnetic steel in the smart indicator is coupled with the magnetic steel in the float. It rotates and drives the sensing magnetic steel and pointer at the same time. The magnetic field change is converted into an electrical signal through a magnetic sensor. A/D conversion, digital filtering, temperature compensation. Microprocessor processing, D/A output. LCD liquid crystal displays the instantaneous flow and cumulative flow.

Extended reading: Beginner’s Guide: Variable area flow meter

Rotameter is a common type of flowmeter. The flowmeter is an industrial instrument for measuring the flow of liquids, gases, and other media. There are many types of flow meters. Such as electromagnetic flowmeter, turbine flowmeter, vortex flowmeter, and so on. Different flow meters have different measurement principles. For example, the electromagnetic flowmeter is based on the principle of electromagnetic induction. The rotameter is a device that estimates the flow rate by measuring the (position) of the rotating parts installed in the DC pipeline.

Extended reading: How does a rotameter work

The flow detection element of the float flowmeter is composed of a vertical tapered tube that expands from bottom to top and a float group that moves up and down along the axis of the tapered tube. Below, I will give you a specific introduction to the classification of rotameters.

Glass rotameter:

Glass rotor flowmeters are mainly used in various departments such as the chemical industry, petroleum, light industry, medicine, fertilizer, chemical fiber, food, dyes, environmental protection, and scientific research. Used to measure the flow of single-phase non-pulsating (liquid or gas) fluids. The anti-corrosion glass rotor flowmeter is mainly used for the detection of corrosive liquid and gas medium flow. Such as strong acid, strong acid, oxidant, strong oxidizing acid, organic solvent, and other corrosive gas or liquid medium flow detection.

Extended reading: Gas Rotameter Tips

Plastic tube rotameter:

The main parts such as the liquid plastic tube rotameter cone tube are made of AS, ABS plastic. Has relatively good corrosion resistance. The product also has the characteristics of reasonable structure, small size, lightweight, and the tapered tube is not easily broken. The plastic tube rotor flowmeter can be widely used in chemical, environmental protection, food, and other industrial sectors.

Plexiglass rotameter:

Plexiglass rotameter is divided into panel type plexiglass rotameter and pipeline type plexiglass rotameter.

Plexiglass rotameter also has the characteristics of high transparency, intuitive reading, not easy to break, lightweight, long life, and convenient installation and connection. However, the tapered glass tube of plexiglass cannot be used for organic solvents (such as trichloroethylene, dichloroethane).

Metal tube rotameter:

Metal tube rotameter is divided into on-site pointer indication type and remote transmission type.

Metal float flowmeter is a kind of flow measuring instrument commonly used in industrial automation process control. It has the characteristics of small pressure loss, large detection range (range ratio 10:1), and convenient use. It can be used to measure the flow of liquid, gas, and steam. It is especially suitable for medium flow measurement with low flow velocity and small flow.

Extended reading: Vortex Steam Flow Meter

The metal float flowmeter has a local display type and an intelligent remote transmission type. With pointer display. Instantaneous flow, cumulative flow, liquid crystal display. Upper and lower limit alarm output. Cumulative pulse output, standard two-wire 4-20mA current output, and other forms. Provide users with a very wide choice of space. In addition, the instrument uses a high-quality MCU micro-processing system. Ensure the excellent performance of the flowmeter in various applications.

Extended reading: Beginner’s Guide: Variable area flow meter

Digital Rotameter

Digital rotameters are easier to read than analog rotameters as well as pointer-displayed rotameters.

Digital rotameters is a smart transmitter added to the original rotameters.

The metal shell has a built-in intelligent circuit board. Intrinsically safe explosion-proof structure design, explosion-proof mark iallCT5.

The indicator has both a separate mechanical pointer for instantaneous flow. There are also five liquid crystal digital display instantaneous flow and eight digital display cumulative flow. And equipped with button operation, human-computer interaction interface. It can also output 4-20MA current signal, upper and lower limit alarm and other signals.

Digital rotameters also have a variety of parameter calibration, setting functions, data backup, data recovery and power failure protection. In addition, when it is not a two-wire power supply mode, the LCD backlight display function is also selected.

Related Products:

More Flow Measurement Solutions

Solid Flow Meter

What Is a Solid Flow Meter? The solid flow meter is suitable for the measurement…

Extended reading: Radar level sensor for solids – Dust solid level measurement

Metal Tube Rotameter price

Sino-Inst offers over 30 Metal Tube Rotameter products. About 50% of these are for liquids. 40% are for gas. At best price.

You can refer to the product price of the following Rotameter flow meter price:

MMetal Tube Rotameter
Pipe size 1/2 inch
Medium: oxygen
FOB Price: USD 281.50/pc

Check more Choosing The Right 1 Inch Flow Meter.

A wide variety of Metal Tube Rotameter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Rotameter flow meters, located in China.

The top supplying country is China (Mainland), which supply 100% of the Rotameter flow meter respectively.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Metal Tube Rotameter products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Sulfuric Acid Storage Tank Level Measurement-Radar Level Sensor

Sulfuric acid storage tanks are mainly used to store sulfuric acid produced in acid production. The accuracy of the liquid level of the sulfuric acid storage tank is directly related to the continuity of production. Because the sulfuric acid storage tank stores 98% concentrated sulfuric acid. There will be Part of the acid mist will have a certain impact on the liquid level detection.

Because of the anti-corrosion and anti-disturbance problems, the traditional detection instruments are not suitable for detection. Only the radar liquid level sensor can achieve a relatively high measurement accuracy. It has the characteristics of high continuous measurement accuracy, non-contact type, large measurement range, and good anti-corrosion performance.

Radar Level Measurement and guide wave radar level measurement Image source: https://instrumentationtools.com/radar-level-measurement/

Very short microwave pulses with very low energy are transmitted and received through the antenna system. The radar wave runs at the speed of light. The operating time can be converted into level signals by electronic components. A special time extension method can ensure stable and accurate measurement in a very short time.

Electromagnetic waves propagate in the air at the speed of light. The distance between the radar level sensor and the surface of the material can be expressed by the following formula:   

D = (1/2)*CT

In the formula:

D ———the distance between the radar level sensor and the surface of the material;   

C ———Speed of light   

T ———Pulse time.

Then the liquid level is:   L = E-D

In the formula:

L — liquid level;   

E ———The total height of the tank;   

D ———Air height.

Even in the presence of false reflections, the new micro-processing technology, and the unique ECHOFOX- software can accurately analyze the level echo. By inputting the size of the container, the distance value can be converted into a signal proportional to the level. The instrument can be debugged with empty positions.

Extended reading: FMCW Radar Level Transmitter 120GHz

  • The radar level sensor adopts an integrated design and has no moving parts. There is no mechanical wear and long service life;
  • The electromagnetic wave emitted by the radar liquid level sensor does not need a transmission medium. Not affected by the atmosphere, steam, and volatilized fog in the tank;
  • Not affected by the density and concentration of the liquid in the tank;
  • Can be used for high temperature and high-pressure liquid level measurement;
  • Strong corrosion resistance and can adapt to highly corrosive environments;
  • It has the function of false echo suppression. Suppress the false echo signal from the liquid surface to the antenna through false echo. Eliminate the interference of false echoes;
  • The radar liquid level sensor has no measurement blind zone, and the accuracy can be very high.

Extended reading: Radar Level Sensor Advantages and Disadvantages

Extended reading: Non contact level measurement

Sulfuric acid storage tank level measurement

We have provided customers with radar level transmitters for level measurement in sulfuric acid tanks.

The diesel-sulfuric acid storage tank is a vertical storage tank. Because there is a large amount of volatile gas in the tank. Therefore, the equipment is required to be explosion-proof without being affected by the gas. Based on the internal structural characteristics of the pyrosulfuric acid storage tank and the characteristics of the storage medium. Our company chose a non-contact intelligent radar level transmitter to measure the level of the medium.

There are 6 sulfuric acid storage tanks, and the tanks can be connected. To ensure the accuracy and safety of the measurement. Radar level transmitters are installed on the 6 tanks respectively, which are on standby for each other. And under normal circumstances, the accuracy of the two liquid level measurement values ​​can be compared by reference.

When installing the radar wave level transmitter, the inclined installation method was first adopted. Its inclination angle does not exceed 15°.

Extended reading: Diesel Tank Level Monitoring System

When debugging the level gauge, it is found that there is no level data display. Analyze the cause of the failure because the emitted radar wave is reflected back on the steel plate of the tank. The main reason is that the false echo interference is too large. After re-adjusting the installation angle of the radar level transmitter, it was found that level data appeared. However, the data fluctuates greatly, and due to analysis reasons may be due to liquid level fluctuations.
Radar wave reflections cause effects.

For this reason, it was decided to install a reflector in the measuring tube in the tank. Readjust the installation of the radar level transmitter. Make the plane of the transmitting antenna of the radar wave parallel to the reflector. The level data measured in this way is more accurate.

Calculation of the area of ​​the reflector:
Adopt an intelligent radar liquid level transmitter. Its antenna size parameter DN80/3″
Beam angle a=10°,
According to the formula Tan5°=W/2D,
It can be calculated that W=900mm,
Furthermore, the area of ​​the reflector is obtained.

Therefore, we can make a disc with a diameter of not less than 900mm.

Extended Reading: Silo/Bin material level measurement system

Connect the signal wire on the wiring terminal of the radar level transmitter to the safety barrier. That is, first pass the safety barrier and then connect to the I/0 card of the DCS and the SIS system. And complete the software configuration and the parameter setting of the radar level transmitter.

The change of the medium level of the storage tank can be monitored in real-time through the DCS system. And to realize the remote control of the storage tank level and the monitoring of real-time/historical data.

Extended reading: Radar Liquid Level Sensor|Corrosive, steam, volatile liquids

Extended reading: Diesel fuel tank level gauges & indicators

We generally encounter liquid level measurement in chemical plants such as petroleum storage tanks, chemical storage tanks, chemical storage tanks, sewage treatment plants, dosing tanks, seasides, and docks. Used to measure corrosive media such as sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid, sodium hydroxide, and concentrated alkali.

When encountering these corrosive media, we generally choose corrosive ultrasonic level sensors and use non-contact radar level sensors to measure corrosive liquids such as sulfuric acid, hydrochloric acid, and nitric acid. Below we introduce, we have to consider two major principles in the selection of level sensor measurement.

The first principle: the principle of non-contact measurement needs to be considered. Choose a non-contact level sensor.

Because the probe of the level sensor does not need to touch the medium. The principle of the sensing band is used to obtain the current liquid level information. For example, when the radar level sensor measures the level, it does not touch the measured medium. The selected material is tetrafluoroethylene. At the same time, it is a fully enclosed anti-corrosion structure. Therefore, the effect is very good for the liquid level measurement of viscous, corrosive, turbid, and other liquids.

Extended Reading: GWR Level Sensor for High Temperature & High Pressure

The second principle: to consider the convenience of on-site installation.

Due to the uniqueness of the measurement of corrosive liquids such as sulfuric acid, hydrochloric acid, and nitric acid. It needs to be easily installed on-site. It needs to be simple to open a hole in the jar.

Therefore, in the selection process of the level sensor, it is necessary to consider the characteristics of reliable work, easy installation, long service life, and maintenance-free.

The third principle: sensor selection.

When the radar level sensor measures corrosive media, the general manufacturers will choose the anti-corrosion type tetrafluoro material contact surface. Considering environmental factors, a physically sealed anti-corrosion probe should be selected for this occasion.

Extended reading: Applicaitons Of Magnetostrictive Level Transmitters

The fourth principle: the choice of the host part.

For the most part, good sealing is required. As long as there is a little leakage of the medium. It is possible to enter the inside of the level sensor from the housing or the wire inlet. As a result, the internal circuit board is corroded. For corrosive gases in the environment, anti-corrosion high-frequency radar level sensors can be used to protect the service life of the host.

The above is how we analyzed how to choose a level sensor for concentrated sulfuric acid and hydrochloric acid. If concentrated sulfuric acid and hydrochloric acid exceed a certain temperature range, and steam or vaporization occurs, it is necessary to consider the actual situation on-site and re-select the appropriate level sensor.

Extended reading: Ultrasonic level transmitter for Hazardous Liquids

From the working principle of ultrasonic level transmitter and radar level transmitter, we can see that the two have many similar parts. There is little difference in sulfuric acid corrosion resistance. This is also an important reason why many meter users do not know how to choose.

Both dilute sulfuric acid and concentrated sulfuric acid have acid mist and are volatile. Moreover, when the sulfuric acid pump is running, foams of different degrees will be generated on the surface of the sulfuric acid. These factors will affect the accuracy of the sound velocity measurement of the ultrasonic liquid level transmitter. In this regard, feedback results from a large number of user applications show that in measuring the level of sulfuric acid, both domestic and foreign ultrasonic level transmitters are not ideal.

Because the electromagnetic wave of the radar level transmitter is less affected by factors such as gas, foam, and dust. Therefore, radar level transmitters, especially high-frequency radar level transmitters, can be better used for sulfuric acid level measurement.

Extended Reading: Low Cost Float Level Sensor for Tank Liquid Volume Monitoring

In comparison, the measurement of the radar level transmitter is more accurate. Therefore, the radar level transmitter is more suitable for the level measurement of sulfuric acid than the ultrasonic level transmitter.

In specific practice, although the radar level transmitter is effective in measuring the level of sulfuric acid. But in the measurement of the sulfuric acid level in the first suction tank, the sulfuric acid level in the second suction tank, and the sulfuric acid level in the underground tank. Anti-corrosion float level transmitters are widely used. This is because the price of radar-level transmitters is relatively expensive. The anti-corrosion float level transmitter is more cost-effective.

But in terms of measuring the level of sulfuric acid storage tanks. Few sulfuric acid plants use anticorrosive float level transmitters. This is because the anti-corrosion float level transmitter is under the impact of liquid from a higher tank. The guide rod is prone to bend. It is not suitable for use in sulfuric acid storage tanks. Most sulfuric acid plants use radar level transmitters for sulfuric acid level measurement.

Read More about: Ultrasonic level transmitter VS Radar level transmitter

Extended reading: Radar Oil Tank Level Sensor

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Sino-Inst is a manufacturer of Radar level sensor for Sulfuric acid storage tank level measurement.
Sino-Inst offers over 30 Radar level sensors for level measurement.
About 50% of these are used as oil level meters, 30% is the Sulfuric acid storage tank level meter. A wide variety of Radar level sensor options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of Sulfuric acid storage tank level measurement instrumentation, located in China.

Sulfuric acid storage tank level measurement instruments are most popular in North America, Domestic Market, and South America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and ISO14001 certification.

Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is a radar level sensor, pressure sensor, or other equipment, please give us a call.

Extended Reading: What is level transmitter working principle?

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