Category Archives: Liquid Flow Meters

Liquid flow meters, or digital liquid flow meters, are digital flow meters. Liquid flow meters can measure water flow, wastwater flow, fuel flow, and most liquid flow rate. Sino-Instrument offer liquid flow meters, like:
portable flow meter, ultrasonic flow meter,
magnetic flow meter and other differential pressure flow meters.
Sino-Instrument offers liquid flow meters,
for water, mechanical, chemical and other industrial flow measurment.

What is liquid flow sensor?

A liquid flow sensor is generally used to measure the flow rate of a liquid. Like, water, diesel, etc.

Now, there are various flow meters that measure the flow rate of the liquid,  according to different measurement principles.

Magnetic Water Flow Meter

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Magnetic Water Flow Meter is an electromagnetic flowmeter used to measure conductive fluids. Conductive liquids such as drinking water, sewage, wastewater, seawater, ammonia, cement slurry, etc.

Magnetic Water Flow Meter provide highly accurate flow measurement for a wide variety of conductive fluid applications. Magnetic Water Flow Meter is a volumetric flow meter that measures liquids or liquid slurries that have a minimum conductivity of 5 µS/cm. Based on Faraday’s law of electromagnetic induction. Magnetic Water Flow Meter is ideal for wastewater applications or any dirty liquid which is conductive or water based. It is widely used in water treatment, environmental protection sewage measurement and control, papermaking and other industrial and agricultural production processes for flow measurement and control.

Sino-Inst offers a variety of  Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.

Request a Quote
Magnetic Flow Meters

Features of Magnetic Water Flow Meter

  • Not affected by changes in fluid density, viscosity, temperature, pressure and conductivity. The linear measurement principle can achieve high-precision measurement;
  • There are no flow blocking parts in the measuring pipe. The pressure loss is small, and the requirements for straight pipe sections are low;
  • Nominal diameter DN6-DN3000 covers a wide range. There are many choices of lining and electrodes. It can meet the requirements of measuring a variety of conductive fluids;
  • The converter adopts programmable frequency low frequency rectangular wave excitation. It improves the stability of flow measurement and has low power loss;
  • The converter adopts 16-bit embedded microprocessor. Full digital processing, fast calculation speed. Strong anti-interference ability, reliable measurement. High accuracy, flow measurement range up to 1500:1;
  • High-definition backlit LCD display. Easy to use, simple to operate, easy to learn and understand;
  • With RS485 or RS232 digital communication signal output;
  • With conductivity measurement function, it can judge whether the sensor is empty or not. With self-check and self-diagnosis function;
  • Adopt SMD devices and surface mount (SMT) technology. High circuit reliability;
  • Can be used in corresponding explosion-proof occasions.

Guess you like: What is Reynolds number?

Specifications of Magnetic Water Flow Meter

Measuring medium:Conductive liquids
Diameter(mm)DN15~DN3000
Pressure(MPa)DN15-DN300, PN<1.6MPa; DN350-DN800, PN<1.0MPa;
above DN900, PN<0.6MPa;
Measuring tube materialCarbon steel,304 stainless steel
The sensor measures the head materialABS/Polypropylene
Electrode materialSUS316,hastelloy B,hastelloy C
Accuracyflow velocity≤0.5m/s,±1.5%,Full range velocity>1m/s,±1.0%
Medium temperature(ºC)ABS:+80ºC, Polypropylene:+80ºC
Environmental conditions-25ºC~+60ºC
relative humidity5%~95%,
Atmospheric pressure86~106kPa
Straight pipe section requirementsupstream 15D,downstream 10D
Ingress protectionIP65,Optional IP68
Connectionflange connection,threaded connection
Power supply mode:24V power supply or 220V power supply, 3.6V lithium battery power supply
Explosion-proof grade:intrinsically safe ExdⅡia CT2-T5 flameproof ExdⅡCT2-T5
Transmission distance:Two-wire 4-20mA standard current output: ≤1500m;
485 output and HART output: ≤1200m

Take a quick look: How electromagnetic flowmeters work ?

Magnetic Water Flow Meter Applications

KLD electromagnetic water flowmeter can be used to measure the volume flow of conductive fluid in a closed pipeline. It is widely applied in the flow measurement and control in the fields of chemical and petroleum industry, metallurgy industry, water and wastewater, agriculture and irrigation, paper making, food and beverage industry and pharmaceutical industry.

The premise of using Magnetic Water Flow Meter is that the measured liquid must be conductive. The conductivity of the liquid cannot be lower than the threshold, the lower limit. If the conductivity is lower than the threshold, it will cause measurement error until it can not be used.

It can be measured even if the value exceeds the threshold, and the indication error does not change much. The threshold value of general electromagnetic flowmeter is between 10-4～(5×10-6)S/cm, depending on the model. It also depends on the length of the flow signal line between the sensor and the converter and its distributed capacitance. The product manual usually stipulates the signal line length corresponding to the conductivity.

Read more about: Digital Water Flow Meters

Magnetic Water Flow Meter to Measure Waste Water

The sewage treatment process is mainly through biological oxidation, flocculation, precipitation and other processes to achieve the purpose of sewage purification. At each stage, a certain gauge is needed to measure.

In the sewage industry, according to the characteristics of the corrosiveness, abrasiveness, temperature and condensation of the tested substance and the price tolerance. Different lining and electrode materials should be selected.

In the sewage treatment process, it is necessary to configure corresponding detection instruments according to the process requirements to form a reliable control system.

Generally, sewage treatment plants are equipped with flow meters in the following process inspection procedures:

  1. Water inlet pipe.
  2. Detection of mud volume from primary settling tank to mud storage tank.
  3. Detection of surplus and sludge flow in the sludge pump room.
  4. Detection of the return sludge flow in the sludge pump room.
  5. Detection of the effluent flow of the secondary settling tank distribution well.
  6. Detection of the sludge intake of the digestion tank.
  7. Digestion tank Mud output detection. 8. Flocculation tank reagent input detection, etc.

More about: Sewage Flow Meter Selection

Magnetic Water Flow Meter to Measure Industrial Water

The conductivity of industrial water and its aqueous solution is greater than 10-4S/cm. The conductivity of acid, alkali and salt solution is between 10-4～10-1S/cm, so there is no problem in use. Low distilled water is 10-5S/cm and there is no problem.

The electromagnetic flowmeter cannot measure liquids with very low conductivity. Such as petroleum products and organic solvents. Cannot measure gas, steam and liquids containing more and larger bubbles.

It is found from the data that some pure liquids or aqueous solutions have low conductivity and are considered unusable. However, in actual work, we will encounter examples that can be used because of impurities. Such impurities are beneficial to increase conductivity.

For aqueous solutions, the conductivity in the data is measured in the laboratory with pure water ratio. The actual aqueous solution may be proportioned with industrial water. The conductivity will be higher than found, which is also conducive to flow measurement.

Extended reading: Industrial VS Residential inline water flow meters

Magnetic Flow Meter Price

Electromagnetic flowmeter selection table
KLD               SENSOR
Nominal
diameter		 15             DN15 0.19-3.18m³/h
…             … Unit:mm
3000             DN3000 
Pressure rating 6           0.6Mpa
10           1.0Mpa
16           1.6Mpa
40           4.0Mpa
…           Special requirements
160           16.0Mpa
Connection mode F         Flange
I         plug-in
C         Sanitary type-clamping connection
ST         Sanitary-thread connection
Lining material 1       Polytetrafluoroethylene(PTEE)
2       Polychloroprene
3       Polyurethane rubber
4       F46
5       Fluorosilicone gum
6       PFA
Electrode material Y     One body
F     Separate type
L     Separate type/immersion
Structure of flowmeter 1   SUS316L
2   Hastelloy b 2B
3   Hastelloy b 2C
4   Titanium
5   Tantalum
6   Platinum iridium alloy
7   Stainless steel coated tungsten carbide
Output signal P Volume flow4-20mA/pulse
B Volume flow4-20mA/RS232
M Volume flow4-20mA/RS485
H Volume flow HART protocal output

Extended Reading: LORA water meter

Main performance of lining material:

Lining materialMain performanceScope of application
Polytetrafluoroethylene (PTFE)1. A material with relatively stable chemical properties in plastics can withstand boiling hydrochloric acid, sulfuric acid and aqua regia, but also resistant to concentrated alkalis and various organic solvents, and is not resistant to chlorine trifluoride, high-flow liquid fluorine, liquid oxygen, and ozone. corrosion.
2. Poor wear resistance		Strong corrosive media
such as concentrated acid and alkali
PFACorrosion resistance is the same as PTFE, strong resistance to negative pressureCan be used in negative pressure state
F461. Corrosion resistance is the same as PTFE 2. Low abrasion resistance 3. Strong negative pressure resistance1. Same as PTFD
2. Can be used for low-wear media
Neoprene1. Excellent elasticity, high breaking force, good wear resistance
2. Resistant to the corrosion of a certain low concentration of acid, alkali, and salt media, and not resistant to the corrosion of oxidizing media		Water, sewage, ore slurry, weak abrasive mud
Polyurethane1. Excellent abrasion resistance (equivalent to 10 times of natural rubber)
2. Poor acid and alkali resistance
3. Cannot be used for water mixed with organic solvents		Neutral and strong abrasion slurry, coal slurry, mud, etc.

Corrosion resistance of electrode material:

Electrode materialCorrosion resistance
SUS316Used for industrial water, domestic water, and weak alkali corrosive media,
Widely used in petroleum, chemical, urea, vinylon and other industries
Stainless steel coated tungsten carbideFor non-corrosive, strong abrasive media
Hastelloy B (HB)It has good corrosion resistance to all concentrations of hydrochloric acid below the boiling point, and it is also resistant to sulfuric acid, phosphoric acid, hydrofluoric acid, organic acids, etc.
Corrosion of oxidizing acid, alkali, and non-oxidizing salt solution
Hastelloy C (HC)It is resistant to oxidizing acids, oxidizing salts or other oxidizing agents.
Titanium (Ti)It is resistant to corrosion by sea water, various chlorides and hypochlorites, oxidizing acids, organic acids, alkalis, etc., but not resistant to corrosion by purer reducing acids. But if the acid contains an oxidant, the corrosion is greatly reduced
Tantalum (ta)It has excellent corrosion resistance, which is very similar to glass, except for hydrofluoric acid, fuming sulfuric acid and alkali, it can withstand the corrosion of almost all chemical media.
Platinum-iridium alloyAlmost suitable for all chemical substances, but not suitable for aqua regia and ammonium salt.

Extended Reading: 3 inch (3″) Water Flow Meter

The price of electromagnetic flowmeter is determined by the selection of electromagnetic flowmeter. The Magnetic Water Flow Meter reference price is USD550.00-3000.

The key questions which need to be answered before selecting a magnetic flow meter are:

  • Is the fluid conductive or water based?
  • Is the fluid or slurry abrasive?
  • Do you require an integral display or remote display?
  • Do you require an analog output?
  • What are the minimum and maximum flow rate for the flow meter?
  • What are the minimum and maximum process pressure?
  • What are the minimum and maximum process temperature?
  • Is the fluid chemically compatible with the flow meter wetted parts?
  • What is the size of the pipe?
  • Is the pipe always full?

How much is a 2 inch water flow meter? Let’s find out.

If you have question about Magnetic flow meter,

Please contact us, our engineer will offer help.

Extended Reading: Guide: Magnetic Flowmeter Installation

Featured Water Flow Meters

Remote Magnetic Sewage Flow Meter
Insertion Magnetic Flow Meter
Magnetic Sanitary Flow Meter
Handheld Ultrasonic Flow Meter
Ultrasonic Clamp on Flow Meter
Ultrasonic Insertion Flow Meter
Liquid Turbine Flow Meter
Turbine Insertion Flow Meter

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

Sino-Inst offers over 50 magnetic water flow meter for flow measurement. About 50% of these are wastewater flow meters, 40% is the liquid flow sensor. And 20% are Ultrasonic Flow Transmitter and mass flow meter.

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

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

Request a Quote

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SI-LG Orifice Plate Flow Meter

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Orifice plate flow meter also called orifice flow meter or orifice plate. Orifice plate flow meter is a kind of differential pressure flow meter.

Orifice plate flow meter works together with an orifice plate, differential pressure transmitter, with Differential Pressure Measurement principle. Easy installation. Orifice plate flow meters can be used with gases, liquids, corrosive, and high temperature fluids. Orifice flow meters can measure steam, gas, liquids, and many industrial areas. Applications include steam flow, boiler feedwater, and fluid flow rates in building water lines.

Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!

Get a Quote DP Flowmeters

Features of Orifice Plate Flow Meter

  • The structure of the throttling device is easy to copy, simple, firm, stable and reliable in performance, long in service life, and low in price.
  • Orifice flowmeter calculation adopts international standards and processing
  • Wide application range, all single-phase flows can be measured, and some mixed-phase flows can also be applied.
  • The standard throttling device can be put into use without real flow calibration.
  • The integrated orifice plate is simpler to install, no pressure pipe is needed, and it can be directly connected to a differential pressure transmitter and a pressure transmitter.
  • It has a wide range of applications, including all single-phase fluids (liquid, gas, steam) and partial mixed-phase flows. The pipe diameter and working conditions (temperature, pressure) of the general production process can be measured;

Orifice Plate Flow Meter Specification

SI-LG integrated orifice flowmeter is a high-range ratio differential pressure flow device. Composed of standard orifice plate and multi-parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter and pressure transmitter).

It can measure the flow of gas, steam, liquid and natural gas, and is widely used in process control and measurement in petroleum, chemical, metallurgy, electric power, heating, water supply, and other fields.

Execution standardDesign, manufacture, and installation in accordance with international standard ISO5167-1(1991)(national standard GB/T2624-93),
British standard BS1042 and other standards
Precision level(1)Standard orifice plate, standard nozzle: there are many factors that affect the measurement error.
If the installation and use meet the relevant provisions of international standard ISO5167-1 (1991), the accuracy level can generally reach level 1 ~1.5.

(2) For non-standard orifice plates (such as double orifice plates, circular missing orifice plates, small orifice plates, etc.).
Due to insufficient test data, there is no “standard” to check, so calibration should be conducted after the design and manufacture is completed. (liquid flow is usually calibrated with water. And the air calibrates the gas flow.
The level of accuracy (basic error) can be achieved after calibration: level 1 ~1.5, if not calibrated.
Only by empirical data calculation, design, accuracy in ±2.5%.
Diameter(mm)25,40,50,65,80,100,125,300,350,400, 450,500,600,700,800,900,1000,1200
Nominal working pressure(MPa)0.6,1.0,1.6,2.5,4.0,6.3,10.0,16.0, ≤40Mpa.
(when ≥20Mpa ,it can use high pressure lens orifice plate or welding type)
Conditions of useThe environment temperature:-30ºC~60ºC
Medium temperature:-30ºC~550ºC
Working power supply24VDC/220VAC
Singal remote output4~20mA
Communication outputRS485 communication(Modbus-RTU);
Hart protocol
Signal interfaceInternal thread M20*1.5
(NPT1/2 needs to be customized, long delivery time)
Protection levelIP65 (customized  IP68 for basic model)
Explosion-proof levelExdIICT6 GB
DisplayDifferential pressure, instantaneous flow, cumulative flow

Orifice Plate Types

Sino-Inst supplies all kinds of the orifice plate, for differential applications.

SQUARE EDGE (STANDARD) BORE

For the common square edge concentric bore orifice, the bore and bevel is the standard method of limiting the plate edge thickness.

Unless otherwise specified, plates will be beveled to the currently accepted standards.

QUADRANT EDGE BORE

The quadrant edge bore is an orifice with the inlet edge rounded. Instead of beveling, the plate is counterbored to the desired edge thickness.

The radius of the quarter circle bore is a function of the orifice-to-pipe ratio (d/D). Thickness at the throat is equal to the radius.

This bore is specifically designed for viscous fluids such as heavy crudes, syrups, and slurries with Reynolds Numbers below 100,000.

ECCENTRIC BORE

Eccentrically bored orifice plates are plates, with the orifice off-center, or eccentric, as opposed to concentric.

The bore of the eccentric orifice normally is inscribed in a circle, which is 98% of the pipe diameter, so that solids or slurries may pass through.

Eccentric orifice plates are used in many industries, including heavy and light chemicals, steel, paper, nuclear and petrochemicals.

SEGMENTAL BORE

Segmentally bored orifice plates are provided for measurement, where solids are entrained in a gas or liquid flow stream.

The circular portion of the bore is inscribed within a circle, which is normally 98% of the pipe diameter.

The segmental opening may be placed either at the top or bottom of the pipe.

Industries using these bores include sewage treatment, steel, chemical, water conditioning, paper, and petrochemical.

RTJ Type Orifice Plates

The RTJ type orifice plate incorporates an integral gasket, either oval or octagonal ring, for mounting between ring type joint flanges.

It is based on proven technology, has no moving parts and is suitable for high temperature and pressure applications.

RTJ type orifice plates can be supplied complete with ANSI B16.36 orifice flanges.

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

Orifice plates are recommended for clean liquids, gases, and low-velocity stream flows.

Plate thicknesses depend on line size and differential pressure and should be sufficient, to prevent the plate from bending under operating conditions. Orifice plates can be made in accordance with customer drawings as required.

If you still have questions about orifice plate flow meters, Just contact us. Our engineers will offer help.

Advantages of Orifice Plate Flow Meter

  • The Orifice meter is very cheap as compared to other types of flow meters.
  • Less space is required to Install and hence ideal for space-constrained applications
  • The operational response can be designed with perfection.
  • Installation direction possibilities: Vertical / Horizontal / Inclined.

Orifice Flow Meter Applications

  • Natural Gas
  • Water Treatment Plants
  • Oil Filtration Plants
  • Petrochemicals and Refineries
Orifice Plate
Orifice flow meter diagram
orifice flow meter diagram

Of course, in the water supply or wastewater treatment industry, in addition to orifice flowmeters, electromagnetic flowmeters are also the first consideration for many users in the measurement of water flow.
For example, if you need to measure the flow of wastewater in a 2-inch pipe. Then you may refer to: Magnetic Flow Meters Guides.

How much is a 2 inch water flow meter? Let’s find out.

Orifice Plate Flow Meter Installation


Orifice plate installation

Orifice plate installation

1. Meter manifold piping should always be installed to enable calibration as well as to protect the differential element against overage.

2. The meter should be installed as close as possible to the orifice fitting.

3. Always slope the manifold lines gently from the orifice fitting to the meter to eliminate any high or low points in the manifold lines.

4. Use condensate chambers or air traps to remove either liquid from a gas system or gas from a liquid system if lows or highs in the manifold piping cannot be avoided.

It is important when pressurizing or depressurizing differential measuring devices to apply or release pressure to or from the high and low meter chambers uniformly, so as not to impose excessive overage.

What is an Orifice Meter?

An orifice meter is a conduit and a restriction to create a pressure drop.

An hourglass is a form of the orifice.

A nozzle, venturi or thin sharp-edged orifice can be used as the flow restriction.

In order to use any of these devices for measurement, it is necessary to empirically calibrate them.

That is, pass a known volume through the meter and note the reading in order to provide a standard for measuring other quantities.

Due to the ease of duplicating and the simple construction, the thin sharp-edged orifice has been adopted as a standard and extensive calibration work has been done, so that it is widely accepted as a standard means of measuring fluids.

Provided the standard mechanics of construction are followed no further calibration is required.

The minimum cross-sectional area of the jet is known as the “vena contract”.

How does an orifice flow meter work?

I guess most people wondered: What is the working principle of orifice meter?

As the fluid approaches the orifice the pressure increases slightly and then drops suddenly as the orifice is passed.

It continues to drop until the “vena contract” is reached, and then gradually increases, until at approximately 5 to 8 diameters downstream, a maximum pressure point is reached, that will be lower than the pressure upstream of the orifice.

The decrease in pressure as the fluid passes thru the orifice, is a result of the increased velocity of the gas passing thru the reduced area of the orifice.

When the velocity decreases as the fluid leaves the orifice the pressure increases, and tends to return to its original level (To level transmitters).

All the pressure loss is not recovered because of friction, and turbulence losses in the stream.

The pressure drop across the orifice increases when the rate of flow increases.

When there is no flow there is no differential.

The differential pressure is proportional to the square of the velocity, it thus follows that if all other factors remain constant, then the differential is proportional to the square of the rate of flow.

Video source: https://www.youtube.com/embed/oUd4WxjoHKY?rel=0

Equations used in this orifice plate Calculator

Qv = 218.527*Cd*Ev*Y1*(d2 )*[Tb/Pb]*[(Pf1*Zb*hw)/(Gr*Zf1*Tf)]0.5 (3-6)

Where

Cd = Orifice plate coefficient of discharge

d = Orifice plate bore diameter calculated at flowing temperature (Tf) – in.

Gr = Real gas relative density (specify gravity)

hw = Orifice differential pressure in inches of water at 60 degF

Ev = Velocity of approach factor

Pb = Base pressure – psia

Pf1 = Flowing pressure (upstream tap – psia

Qv = Standard volume flow rate – SCF/hr.

Tb = Base temperature – degR

Tf = Flowing temperature – degR

Y2 = Expansion factor (downstream tap)

Zb = Compressibility at base conditions (Pb,Tb)

Zf1 = Compressibility (upstream flowing conditions – Pf1, Tf)

Orifice Plate Flow Meter Calculation

Converters for conversion and calculation of flow. Or a calculation tool that requires flow measurement to obtain other measurement parameters. Help users choose the right flow sensor and transmitter!

DP Flow Meter Output CalculatorFlow Meter 4-20mA Current Output CalculatorFlow Velocity & Pipe Diameter to Volumetric Flow Rate Calculator
Mass Flow & Density to Volume Flow CalculatorMass Flow Rate Unit ConverterVolume Flow Rate Converter
Volume Flow & Density to Mass Flow CalculatorVolumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

Venturi Flow Meter

Venturi flow meter is also called classical venturi, and is used to call venturi meter, standard venturi. It is used to measure the flow of single-phase stable fluid in closed pipelines.

Venturi flow meter is a flow measurement method based on the principle of differential pressure. Commonly used to measure the flow of fluids such as air, natural gas, coal gas, and water. In the standard throttling device, the upstream and downstream straight pipe sections required by it are short. The lasting pressure loss is small, the performance is stable, and the maintenance is convenient.

What is the difference between Venturimeter and orifice meter?

The difference between venturi flowmeter and orifice flowmeter:

Orifice flow meters and Venturi flow meters are very different in many aspects.

In order to reduce the loss of the kinetic energy of the fluid mechanics flowing through the saving components, the Venturi flowmeter uses each section of tapered and divergent tubes to replace the orifice.

The orifice flowmeter is equipped with an interchangeable orifice plate with a small circular hole on the upper side, which is much smaller than the diameter of the pipe. The orifice plate is placed on the side of the fluid mechanics pipe.

More about: Venturi Tube Flowmeter

1.The orifice flowmeter is similar to the Venturi flowmeter in the working principle. But some of the main differences are: the orifice plate can be easily replaced to accommodate a wide range of different flow rates.

The throat diameter of the venturi is fixed, so that the measured flow rate range is limited by the actual pressure difference.

Due to the vortex on the downstream side of the orifice, the permanent loss of the orifice flowmeter is very large.

The structure and shape of the Venturi flowmeter can avoid the formation of vortices, which can greatly reduce permanent losses.

2.The energy loss of Venturi flowmeter in measuring flow is much smaller than that of orifice flowmeter.
However, because the venturi flowmeter is more time-consuming in manufacturing and processing than the orifice flowmeter, and the price is high, the orifice flowmeter has the least trouble and the lowest cost during pipeline installation.

3.In terms of fluid measurement, Venturi flowmeters are generally used for low-velocity gas flow measurement.

The flow coefficient of the orifice plate in the orifice flowmeter is significantly affected by the fluid disturbance, and this disturbance comes from the influence of the valves, elbows and other pipe fittings installed upstream of the orifice plate. The value of its discharge coefficient is less affected by downstream disturbances. Generally, this kind of flowmeter should be installed at a distance of 50 times and 10 times the pipe diameter from the upstream and downstream disturbance components, respectively. Obviously the required distance is related to the nature of the disturbance.

Therefore, when measuring with an orifice flowmeter, the orifice flowmeter must be installed correctly according to the disturbance of the fluid.

The above is a detailed introduction to the question of “What is the difference between a venturi flowmeter and an orifice flowmeter”, I hope to help everyone.
If you have any other questions about this issue, please click Online Consultation and consult online customer service.

Extended reading:  Flow Nozzle for Steam Flow Measurement

Orifice flow meter

Frequently
Asked
Questions

Help Center

Orifice Meter is a liquid and gas flow measuring instrument. It is mainly used in high temperature and high pressure measurement conditions. Orifice Meter has the characteristics of high temperature resistance, the temperature can reach 700 degrees, and the pressure is 30MPa. In the field of high temperature and high pressure measurement, Orifice Meter is Use more differential pressure flowmeters.

What is the calibration accuracy of the orifice flowmeter?
The orifice flowmeter is a flow measuring instrument. The accuracy of the orifice flowmeter is within the range of ±0.5% to 1.5%. The orifice flowmeter has the characteristics of high temperature and high pressure. It is mainly used to measure steam and hot air. , Measurement conditions of heat transfer oil.

DPT meter is also a differential pressure transmitter.

DP transmitters are Differential Pressure Transmitters. DP transmitter measures the pressure difference between the gas or liquid at both ends of the transmitter. Output 4~20mA, 0~5V. Used for liquid level, density and pressure of liquid, gas and steam.

DP transmitters are different from pressure transmitters as they have 2 pressure interfaces. With flanges, capillaries, valve, brackets, throttle devices. Differential pressure transmitters are used to measure the level, density, and flow of liquids, gases, and vapors. Then convert it into 4–20mADC current signal output.

More Featured Products

Magnetic Water Flow Meter
Remote Magnetic Sewage Flow Meter
Insertion Magnetic Flow Meter
Magnetic Sanitary Flow Meter
Gas Turbine Flow Meter
Liquid Turbine Flow Meter
Turbine Insertion Flow Meter
Turbine Pulse Flow Meter

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Sino-Inst offers 12 orifice plate flow meter products. About 90% of these are flow meters.

A wide variety of orifice flow meter options are available to you, such as brass, carbon steel. You can also choose from free samples.

Sino-Inst is an orifice plate flow meter supplier. Orifice plate flow meter products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, including 375 with ISO9001, ISO14001, and Other certification.

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Industrial Magmeter Flow Meters

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What is a Magmeter Flow Meter?

Magmeter Flow Meters are also called Electromagnetic flow meters or magnetic meters. Magmeter Flow Meter is a type of volumetric flow meter. It is mainly used to measure high-precision flow measurements of various conductive fluids. Such as water-based liquids, mixed media such as mud and sludge can also be measured.

Magmeter Flow Meters are based on the principle of electromagnetic induction. We Sino-Inst offer a range of full-bore and insertion electromagnetic meters. Covering pipe diameters from DN6 to DN3000. Accuracy can reach 0.5%.

Contact us

Choose the Suitable Magmeter Flow Meters

Magnetic Water Flow Meter
Remote Magnetic Sewage Flow Meter
Insertion Magnetic Flow Meter
Magnetic Sanitary Flow Meter
Magnetic Stainless Steel Flow Meter
Magnetic Battery Operated Flow Meter
Magnetic Large Dia. Pipe Flow Meter
Magnetic High Pressure Flow Meter
Magnetic Open Channel Flow Meter

Advantages of Magmeter Flow Meters

  • Suitable for measuring two-phase flow containing suspended matter, solid particles, fibers, etc. Such as mud, sewage, ore pulp, pulp, and other viscous slurries.
  • It uses four electrodes and a built-in grounding electrode. It is used for non-conductive pipes without the need for additional electrical rings.
  • It also has 420mA current signal output, pulse output, and instantaneous flow upper and lower limit alarm outputs. RS485 communication and HART protocol are also available.
  • On-site display of instantaneous flow, percentage, flow rate, forward and reverse cumulative flow, and total cumulative amount.
  • The power supply mode can be selected from AC85V~AC220V or DC24V.
  • Daily reports, monthly reports, annual reports, power failures, and other functions can be queried with one click.
More Flow Meters

First, let us look at the structure of the magmeter.

The structure of electromagnetic flowmeter is mainly composed of magnetic circuit system, measuring catheter, electrode, shell, lining and converter.

The electromagnetic flowmeter is made according to Faraday’s law of electromagnetic induction. It is used to measure the volume flow of conductive liquid.

Faraday’s law of induction (referring to the induction of an electric potential inside the conductor when the conductor passes through a magnetic field) is the basic principle of electromagnetic flowmeter measurement.

This measurement principle can be applied to conductive fluids.

The fluid flows into a pipe whose magnetic field is perpendicular to the direction of the fluid, and the electric potential induced in the fluid can be measured using two symmetrically arranged electrodes.

The signal voltage UE is proportional to the magnetic induction intensity B, the electrode spacing D and the average fluid velocity v.

Because the magnetic induction intensity B and the electrode spacing D are constant. Therefore, the signal voltage UE is proportional to the average flow velocity v.

The equation used to calculate the volume flow rate shows that the signal voltage UE is linearly proportional to the volume flow rate.

The sensed signal voltage is converted into the graduation in the converter, analog and digital output signals.

Magmeter flowmeters measure the velocity of conductive liquids (such as water, acid, caustic and slurry) in the pipeline. When measuring deionized water, the minimum conductivity of the medium is 20uS/cm. For most liquids, the minimum conductivity required for measurement can be 5uS/cm.

Magmeter is mainly used in the following areas:

  • Measure clean water, sewage, domestic water, raw water;
  • Various acid, alkali, salt and other solutions;
  • Mud, mineral pulp, paper pulp, and food liquids, etc.;
  • It is widely used in metallurgy, papermaking, water treatment, chemical industry, light industry, textile, food and beverage, catering, agricultural irrigation, hydropower station, oil production, electric power and mining industries.

Extended Reading: Guide: Magnetic Flowmeter Installation

Magmeter liner selection should be selected according to the corrosiveness, abrasiveness and temperature of the measured medium.

  • Hard/soft rubber is resistant to general weak acid and alkali corrosion. Temperature resistance is 65℃. Soft rubber has abrasion resistance.
  • Polytetrafluoroethylene (PTFE) is almost resistant to strong acid and alkali corrosion except hot phosphoric acid. The temperature of the medium can reach 130℃. But it is not resistant to wear.
  • Polyurethane rubber has good wear resistance. But it is not resistant to acid and alkali corrosion. Temperature resistance is also poor. The medium temperature is less than 65°C.
Liner MaterialsFunctionsApplications
Hard rubber1. It is resistant to hydrochloric acid, acetic acid, oxalic acid, ammonia, phosphoric acid and 50% sulfuric acid, sodium hydroxide, and potassium hydroxide at room temperature.
2. Avoid strong oxidants. 		1, below 70℃
2. General acid, alkali, and salt solutions. 
Soft rubber1. It has good elasticity and good wear resistance;
2. It is resistant to the corrosion of general low-concentration acids, alkalis, and salt media, and is not resistant to the corrosion of oxidizing media. 		1. Below 70℃;
2. Measure general water, sewage, mud, ore slurry
Polytetrafluoroethylene (PTFE)
Modified polytetrafluoroethylene (PFA)		1. The material with the most stable chemical properties in plastics. It can withstand boiling hydrochloric acid, sulfuric acid, nitric acid and aqua regia, as well as strong alkalis and various organic solvents;
2. Poor abrasion resistance and adhesion. 		1.-40℃~+130℃C(PTFE),
-40℃~+160℃(PFA);
2. Strong corrosive media such as acid and alkali;
3. Sanitary media. 
PO1. It can withstand hydrochloric acid, acetic acid, oxalic acid, ammonia, phosphoric acid, sulfuric acid, sodium hydroxide, and potassium hydroxide at room temperature.
2. It can withstand concentrated alkali and various organic solvents. 		1. Below 70℃;
2. General acid, alkali, and salt solutions;
3. General water, sewage, mud, mineral slurry. 
CeramicsWear resistance, high temperature resistance, corrosion resistanceBelow 200℃

1.Environmental conditions:

Magmeter flowmeter, especially the flowmeter with intelligent LCD screen. The installation position should avoid direct sunlight as much as possible. The ambient temperature should be between 5℃~55℃.

2.Avoid strong interference sources

Choose a place where there is no strong electromagnetic field radiation to install the flowmeter.

Avoid devices that can easily cause electromagnetic interference, such as motors, transformers, and frequency converters.

The measurement principle of the flowmeter is based on Faraday’s law of electromagnetic induction, the original
The initial signal is very weak, less than millivolt.

If there is strong electromagnetic field radiation near the flowmeter, it will affect the accuracy of the measurement and even fail to work normally.

3.Magmeter straight run

Pay attention to avoid eddy current generating parts as much as possible. Such as various valves, elbows, bypasses, etc.

Try to extend the straight pipe section upstream and downstream of the flowmeter. Install a rectifier tube if necessary.

Ensure that the upstream straight pipe section of the flowmeter must be at least 5 DN (measurement pipe diameter). The downstream is guaranteed to be more than 2 DN.

4.The conductivity of the liquid must be uniform and stable

Do not install the flowmeter in a place where the conductivity of the fluid to be measured is extremely uneven.
If different media are injected upstream, the conductivity will be uneven and will affect the measurement.

In this case, it is recommended to move the injection port downstream.

If it must be injected from upstream, it should be as far away from the flowmeter as possible. Generally, it is better to keep a distance of more than 20 DN. To ensure that the liquid is fully mixed and uniform.

5.Keep the electrode axis level

The plane of the intermittent measuring electrode must be kept level. This prevents short-term insulation between the two electrodes due to air bubbles.

6.Magmeter grounding rings

Since the induction signal of the electromagnetic flowmeter is very weak, it is susceptible to noise. Therefore, the reference potential of the sensor and the converter must be the same as the measured liquid, and be grounded together.

The purpose of installing grounding rings or grounding electrodes on both sides of the electromagnetic flowmeter is to establish the equipotentiality between the flowmeter casing and the liquid.

Ordinary metal pipe (generally no need to install grounding ring)

When the pipeline itself is well grounded, the grounding wire can be omitted, but the casing must be connected to the liquid through the grounding wire equipped with the flowmeter.

Insulated pipes (plastic pipes, rubber-lined pipes, etc.)

A grounding ring (or grounding electrode) should be installed at both ends of the sensor and the measured medium should be short-circuited with the earth through the grounding wire.

Cathodic protection pipeline

The pipe flanges are connected by copper wires, but they must be insulated from the grounding wire.

Magnetic flowmeter is a widely used flow measuring instrument. How should we calibrate it?

Let’s take a look at the calibration method of electromagnetic flowmeter:

  1. Determine the corresponding water pump according to the pipe diameter and flow rate of the verification test;
  2. After the flowmeter is correctly installed and connected, it should be energized and preheated for about 30 minutes in accordance with the requirements of the verification regulations;
  3. If the high-level tank water source is used, check whether the overflow signal of the stabilized water tower appears. Before the formal test, use the verification medium to circulate in the pipeline system for a certain period of time. At the same time, check whether there is any leakage in the sealing parts of the pipeline;
  4. The verification medium should be filled with the electromagnetic flowmeter sensor before the formal verification. Then the downstream valve should be closed to adjust the zero position;
  5. At the beginning of the verification, open the valve at the front of the pipeline and slowly open the valve behind the electromagnetic flowmeter to adjust the flow at the verification point.
  6. During the calibration process, the flow stability of each flow point should be within 1% to 2%-flow method. The total amount law can be within 5%.
    • The temperature change of the verification medium should not exceed 1℃ when the verification process of a flow point is completed. It should not exceed 5℃ when the entire verification process is completed.
    • There must be a sufficiently high pressure downstream of the electromagnetic flowmeter to be checked to ensure that no flashing and cavitation occur in the flow pipeline;
  7. After the test, close the valve at the front end of the test pipeline. Then stop the pump to avoid emptying the voltage stabilization facility. At the same time, the remaining verification medium in the test pipeline must be vented and the control system and the air compressor must be closed.

Extended reading:
What is the K-factor in a flow meter?
Cryogenic Flow Meters|Liquid Nitrogen-Liquid Oxygen-LNG fluids

Magnetic flow meter pDF

Electromagnetic flowmeter ManualDownload

Frequently
Asked
Questions

Help Center

A Rotameter flow meter is a variable area flow meter based on float position measurement. It is suitable for liquid and gas volumetric flow measurement and control.

Read more: Rotameter flow meter working principle

All electromagnetic flowmeters need to be calibrated when they leave the factory. Each finished product needs to pass the calibration line inspection before leaving the factory.

It is to install the product on the assembly line. The front end adopts a strictly debugged standard table. A series of coefficients such as the diameter of the flowmeter, the damping coefficient, and the sensor coefficient of the electromagnetic flowmeter are set at the back end. To achieve the same flow rate as the standard meter.

If calibration is done on-site, it may generally be used to calibrate outside the sealed pipeline. Such as portable ultrasonic flowmeter. But the accuracy is generally 0.5. If you just check it, you can use a portable ultrasonic flowmeter.

Read more: Magnetic flow meter calibration

Ultrasonic flow meters and electromagnetic flow meters have different measurement principles.

Electromagnetic flowmeter must measure conductive liquid. The ultrasonic flowmeter can measure pure single-phase liquid. It has nothing to do with the conductivity of the liquid.

The electromagnetic flowmeter must be in contact with the medium to measure. The ultrasonic flowmeter can do contact and non-contact measurement.

The electromagnetic flowmeter is a flow measuring instrument. The measuring principle of the electromagnetic flowmeter is measured according to its principle of conduction. Most of the flow measurement on the market is solved by electromagnetic flowmeters.

The electromagnetic flowmeter is a pure liquid volume measurement instrument.

The mass flow meter is a function of fluid volume and fluid temperature and pressure. Is a dependent variable. The quality of a fluid is a quantity that does not change with time, space temperature, and pressure.

Mass flow meters are compared with electromagnetic flow meters. It can measure non-conductive media. This is one of the biggest differences. In addition, the accuracy of the mass flow meter is higher. The cost is large, and there are fewer applications in the market.

There is a big difference in the performance of general-purpose electromagnetic flowmeters on the market. Some have high precision and many functions. Some have low precision and simple functions.

The basic error of the instrument with high accuracy is (±0.5%～±1%)R.
The instrument with low accuracy is (±1.5%～±2.5%)FS.
The price difference between the two is 1 to 2 times.

Extended reading: Orifice Plate Flow Meter

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Magnetic flow meter manufacturers

Sino-Inst is one of the reliable Magnetic flow meter manufacturers and suppliers in China. Magnetic flow meters are applied for wastewater flow rate measurement.

Sino-Inst offer over 20 Magnetic flow meters, at the Best Price. A wide variety of Magmeters options are available to you, such as free samples, and paid samples.

About 40% of these are magnetic flow meters, 30% are Insertion Magnetic Flow Meter, and 30% are sanitary flow meters. Magmeters products are most popular in North America, the Middle East, and Eastern Europe.

You can ensure product safety by selecting from a certified supplier, with ISO9001, and ISO14001 certification.

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Reliable Turbine Flow Meter Manufacturer

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Sino-Inst is a Turbine Flow Meter Manufacturer from China. Our turbine flow meters are widely used to measure liquid and gas flow in a variety of industrial, commercial and laboratory applications.

Sino-Inst offers turbine flowmeters for liquids, gases, and more. We can provide you with precision flow measurement solutions at the best price.

RFQ Turbine Flow Meters

Sino-Inst is a leading manufacturer of turbine flowmeters, providing a variety of instruments used in many industries. Including water treatment, food and beverage production, and pharmaceutical research.

We offer a range of products suitable for almost all applications. These include:

  • Water turbine flowmeter;
  • Diesel turbine flowmeter;
  • 304 SS and 316 SS turbine flowmeters with pulse or 4-20mA output;
  • Plastic material turbine flowmeter;
  • Low flow brass and 316 SS turbine flowmeter
  • Ultra-high pressure turbine flowmeter;
  • High temperature, extremely low temperature turbine flowmeter;
  • Gas turbine flowmeter, etc.

When you need reliable, accurate, and best-priced turbine flowmeters, Sino-Inst is your one-stop shop.

Featured Industrial Turbine Flow Meters

Low temperature Turbine Flowmeter-Liquid Nitrogen Flow Meter
Liquid Turbine Flow Meter
Turbine Insertion Flow Meter
Turbine Sanitary flow meter
Turbine Pulse Flow Meter
Gas Turbine Flow Meter

Extended reading: High-quality hydraulic fluid flow meters

More Details About Turbine Flow Meter

A turbine flow meter is a type of flow meter that works by measuring the velocity of a fluid or gas as it passes through a turbine rotor. Turbine flow meters are commonly used to measure the flow of liquids and gases in a wide range of applications. They offer a high level of accuracy, especially in high flow rate applications, and can be used for both clean and dirty fluids. Turbine flow meters are also relatively easy to install and maintain, making them a popular choice in many industries.

Turbine flowmeter is composed of turbine, bearing, preamplifier and display instrument.

The principle of the turbine flowmeter is to place a turbine in the center of the pipeline, and the two ends are supported by bearings. As the fluid passes through the pipes, it strikes the turbine blades. Drive torque to the turbine. Make the turbine rotate by overcoming the friction torque and fluid resistance torque.

In a certain flow range, for a certain fluid medium viscosity, the rotational angular velocity of the turbine is proportional to the fluid velocity. Thus, the fluid flow rate can be obtained from the rotational angular velocity of the turbine, so that the fluid flow through the pipeline can be calculated.

The fluid to be measured impacts the turbine blades, causing the turbine to rotate, and the rotation speed of the turbine changes with the change of the flow rate. That is, the flow rate is large, and the speed of the turbine is also large. Then the rotation speed of the turbine is converted into electric pulses of corresponding frequency by the magnetoelectric conversion device. After being amplified by the preamplifier, it is sent to the display instrument for counting and display. According to the pulse number and cumulative pulse number per unit time, the instantaneous flow and cumulative flow can be calculated.

Turbine flow meters offer a number of advantages over other types of flow meters. Here are some of the key benefits of using turbine flow meters:

  • High accuracy: Turbine flow meters offer a high level of accuracy, especially in high flow rate applications. They have an accuracy of ±0.5% to ±1.0% of reading.
  • Wide flow range: Turbine flow meters have a wide flow range capability. They can measure flow rates from as low as 0.1 GPM (gallons per minute) to as high as 10,000 GPM, depending on the model and size.
  • Quick response time: Turbine flow meters have a fast dynamic response time, which means that they can measure changes in flow rate quickly.
  • Easy to install and maintain: Turbine flow meters are relatively easy to install and maintain. They don’t require a lot of space, and they don’t need a lot of external piping or support.
  • Versatile: Turbine flow meters can be used to measure the flow of a wide range of fluids and gases. Including hydrocarbons, chemicals, water, cryogenic liquids, air, natural gas, and industrial gases.
  • Customizable: Turbine flow meters can be customized to meet specific flow application requirements. Custom features may include: high temperature, extremely low temperature (-196 degrees Celsius), ultra-high pressure, extremely small diameter (DN4, DN6), etc.

Overall, turbine flow meters are a reliable and cost-effective method for achieving high accuracy flow measurement.

No, a rotary meter is a different type of flow meter than a turbine meter. While both are used to measure the flow of liquids or gases, they operate on different principles and have distinct designs.

A rotary meter, also known as a positive displacement meter, works by dividing the fluid or gas being measured into specific volumes and then counting the number of volumes that pass through the meter.

In contrast, a turbine flow meter works by measuring the velocity of the fluid or gas as it passes through a turbine rotor. The rotor spins at a speed proportional to the flow rate, and this motion generates an electrical signal that can be used to measure the flow rate.

While both types of flow meters are used for measuring the flow of liquids or gases, they are different in their operation and design.

As a Turbine Flow Meter Manufacturer- We Can Offer

Extensive customization services:

  1. Product brand OEM
  2. Product parameters customization:
    • Temperature, high temperature or low temperature liquid (liquid nitrogen, liquid oxygen, etc.);
    • Pressure, especially high pressure products, 16MPa, 25MPa, 32MPa, etc.;
    • Small flow, small diameter (DN4, DN6);
    • Signal output: pulse, 4-20mA, RS485, etc.;
    • Hygienic customization: optional 304 stainless steel, 316 stainless steel, clamp installation;
    • Connecting flange: Accept flange thread customization such as German standard DIN, American standard ANSI, and Japanese standard JIS.
  3. Last but not least. We can offer you the most reasonable price. The cheapest price is not necessarily the best product. Reference: DN50 Turbine Flow Meter Price, FOB Price USD 298.00/set.
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Industries & Applications We Serve

Sino-Inst is one of the reliable turbine flow meter manufacturers and suppliers in China. Of course, there are also many Leading Turbine Flow Meter Manufacturers in the international market. For example:

The turbine flow meters we supply from Sino-Inst include liquid turbine flow meters, gas turbine flow meters, etc. We can provide you with precision flow measurement solutions at the best price.

Sino-Inst’s turbine flow meters are made in China. Good quality and more favorable prices. Our flow measurement instruments are widely used in the United States, Indonesia, Singapore, and other countries.

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