Thermocouple

Posted on September 30, 2020 by KimGuo11

Thermocouples are often used to measure the temperature of liquid, steam and gaseous media and solid surface temperatures.

Thermocouples are commonly used temperature measuring components in temperature measuring instruments. It directly measures temperature and converts the temperature signal into a thermoelectromotive force signal. It is converted into the temperature of the measured medium by electrical instruments. Thermocouples are usually composed of main parts such as hot electrodes, insulating sleeve protection tubes and junction boxes. Usually used with display instruments, recording instruments and electronic regulators.

Sino-Inst offers a variety of Thermocouples for Temperature measurement. If you have any questions, please contact our sales engineers.

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Sheath Thermocouple

It is usually used along with display instruments, recording instr-uments, electronic computers and so on. It is able to directly me-asure the temperature of liquid, steam and gas and solid surfacein a variety of production processes within the range of 0 ~1300℃.

The electrode of sheath thermocouple are consisted by two different materials of conductor. When there is a temperature difference between the measuring end and the reference end. It will generate the thermal electric potential. The working instrument will show the corresponding temperature value of the thermal electric potential.

Range for temperature measurement and error-tolerance

Extended reading: LN2 tanks sensor

Assembled Sheathed Thermocouple

Product Applications

Cooling and heating systems
Water supply and water heating systems
Air-conditioning systems
Automation system temperature mensuration and control
Suited for temperature measurement in industrial environments, especially around motors, generators and other high voltage equipment.
Widely used in the injection molding mold.

Temperature measurement range and tolerance error

Explosion-proof Thermocouple

Explosion-proof thermocouple uses the principle of interval
explosion-proof with the junction box and other parts with enough strength where the dangerous parts which will generate spark, electric arc and dangerous temperature are sealed, so when the explosion occurs inside the cavity, the flame of the explosion can be cooled and distinguished in the gap between the joint surface so that the flame and the temperature will not be passed to the cavity.
Finally, the explosion-proof is realized.

Explosion-proof thermocouple Temperature measurement range

Platinum Rhodium Thermocouple

The platinum rhodium thermocouple is a traditional temperature measuring element. It has stable thermoelectric performance and strong oxidation resistance, and is suitable for continuous use in an oxidizing and inert atmosphere. The long-term use temperature is 1600℃, and the short-term use temperature is 1800℃. The technical indicators are as follows:

Temperature measurement range: 0~1800℃
Temperature measurement accuracy: <± 0.5% t
Time constant: ≤180s
Insulation resistance: 5MΩ (at 20℃)
Specification and size: 500, 750, 1000, 1200 (mm)

Product name	Model	Outer sleeve material	Recommended maximum operating temperature
S-type platinum rhodium thermocouple (Platinum Rhodium 10 platinum)	WRP	GH3030GH303925Cr20Ni	800～1000℃
R-type platinum rhodium thermocouple (platinum rhodium 13 platinum)	WRQ	GH3030GH303925Cr20Ni	800～1000℃
Type B platinum rhodium thermocouple (Pt Rh 30-pt RH 6) (double platinum rhodium)	WRR	GH3030GH3039N10276	1200～1300℃

K-type Thermocouple

The K-type thermocouple is used as a temperature sensor. The K-type thermocouple is usually used with display instruments, recording instruments and electronic regulators.

The K-type thermocouple can directly measure the surface temperature of liquid vapor, gaseous media and solids in various production ranges from 0℃ to 1300℃.

K-type thermocouple is the cheapest metal thermocouple with the largest consumption at present, and its consumption is the sum of other thermocouples.

The diameter of K-type thermocouple wire is generally 1.2mm～4.0mm.
The nominal chemical composition of the positive electrode (KP) is: Ni:Cr=90:10, the nominal chemical composition of the negative electrode (KN) is: Ni:Si=97:3, and its service temperature is -200℃~1300℃.
The K-type thermocouple has the advantages of good linearity, high thermoelectromotive force, high sensitivity, good stability and uniformity, strong oxidation resistance, and low price. It can be used in oxidizing inert atmosphere and widely used by users.
K-type thermocouples cannot be directly used in sulfur, reducing or reducing, oxidizing alternate atmospheres and vacuum at high temperatures, nor are they recommended for use in weakly oxidizing atmospheres.

Thermocouple Types

Commonly used thermocouples can be divided into two categories: standard thermocouples and non-standard thermocouples.

The so-called standard thermocouple refers to a thermocouple with a unified standard indexing table that specifies the relationship between the thermoelectric potential and the temperature, the allowable error, and the national standard. It has a matching display instrument for selection.
Non-standardized thermocouples are inferior to standardized thermocouples in use range or order of magnitude. Generally, there is no unified indexing table. It is mainly used for measurement in some special occasions.

Standardized thermocouples China started from January 1, 1988. Thermocouples and thermal resistances are all produced in accordance with IEC international standards. Seven standardized thermocouples of S, B, E, K, R, J, and T are designated as China’s unified design. Thermocouple.

In theory, any two different conductors (or semiconductors) can be made into thermocouples. However, as a practical temperature measuring element, there are many requirements for it.

In order to ensure the reliability in engineering technology and sufficient measurement accuracy. Not all materials can form a thermocouple. Generally, the basic requirements for the electrode material of a thermocouple are:

In the temperature measurement range, the thermoelectric properties are stable. It does not change with time. It has sufficient physical and chemical stability and is not easy to be oxidized or corroded;
Low temperature coefficient of resistance, high conductivity, low specific heat;
The thermoelectric potential generated in temperature measurement should be large, and the relationship between thermoelectric potential and temperature is linear or close to linear single value function;
Good reproducibility of materials. High mechanical strength, simple manufacturing process and low price.

**Stable And Reliable Sheathed Thermocouple**

Sino-Inst, Manufacuturer for Thermocouples, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

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

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

V-series Curved Digital Mass Flow Meter

Posted on September 28, 2020 by KimGuo11

Digital Mass Flow Meter is a micro-bend Coriolis mass flow meter, a general measurement principle for liquids and gases.

Digital Mass Flow Meter can be divided into elbow type and straight pipe type according to different measuring tube shapes. Among them, U-shaped and slightly curved types are the most widely used. The elbow types are divided into U-shaped, slightly curved, △, Ω, water drop, fly swatter, etc., and U-shaped and slightly curved The most extensive. V-series Curved Digital Mass Flow Meter simultaneously measures mass flow, density, temperature and viscosity.

Features of V-series Curved Digital Mass Flow Meter

General measuring principle for liquids and gases
Multivariable measurement: simultaneous measurement of mass flow, density, temperature and viscosity
High measurement accuracy: typical value is ±0.2% o.r.; optional: ±0.1%
The measurement principle is completely unaffected by the physical properties of the fluid and the flow field
No front/rear straight pipe length requirements
Wide measuring range: 1:10, 1:20
The sensor has self-flow performance, easy to drain and easy to clean
Optimized overall structure reduces pressure loss
The installation space is reduced and is not affected by installation conditions and process engineering
High measurement accuracy and good stability
No elbow parts, low wear and long working life
High working frequency, adapt to harsh working conditions

Specifications of V-series Curved Digital Mass Flow Meter

Working temperature of measured medium	-200℃~350℃,Standard form:-50~200℃Low temperature type:-200~200℃
Measurement display unit	mass flow:g/h,kg/h,t/h,g/m,kg/m,t/m Volume flow:cm³/h,d m³/h,m³/h,cm³/m,d m³/m,m³/m Density:kg/m³ or g/cm³,temperature:℃,K,℉
ambient temperature	-40~60℃
Texture of material	Measuring tube:316L ,Shell:304
Accuracy of liquid flow measurement	0.1%,0.15%,0.2%
Measurement range of liquid density	0.3~3.000g/cm³,measurement accuracy±0.002g/cm³
Temperature measurement range	-200~350℃ ,measurement accuracy:±1℃
communication	RS485,MODBUS Agreement
output signal	0~10000Hz Pulse signal, flow signal,collector open circuit signal, 4~20mADCCurrent, Flow and Density Output Signals
Power supply	18~36VDC Power supply:7W(basic)85~265VACPower supply:10W(additional)

Pros and cons of Coriolis Digital Mass Flow Meter

Advantages

The Coriolis mass flow meter directly measures the mass flow rate with high measurement accuracy.
It can measure a wide range of fluids, including high-viscosity liquids, slurries containing solids, liquids containing trace gases, and medium and high-pressure gases with sufficient density.
The measuring tube has a small vibration amplitude and can be regarded as a non-moving part, and there are no obstructions and moving parts in the measuring pipe.
It is not sensitive to the flow velocity distribution of the upflow, so there is no requirement for upstream and downstream straight pipes.
The measured value is not sensitive to the fluid viscosity, and the change of fluid density has little effect on the measured value.
Multi-parameter measurement can be done, such as measuring density at the same time, and deriving the concentration of solute in the measurement solution from this.

Disadvantage

Coriolis mass flow meters cannot be used to measure low-density media and low-pressure gases. The gas content in the liquid exceeds a certain limit (varies by model) will significantly affect the measured value.
Coriolis mass flowmeters are more sensitive to external vibration interference. In order to prevent the impact of pipeline vibration, most models of Coriolis mass flowmeters require high installation and fixation of flow sensors.
Cannot be used for larger pipe diameters, currently limited to less than 200mm.
The inner wall of the measuring tube is worn, corroded, or deposited and scaled, which will affect the measurement accuracy, especially for the Coriolis mass flowmeter of the thin-walled tube.
The pressure loss is relatively large, which is equivalent to that of volumetric meters. Some Coriolis mass flowmeters are even 100% larger than volumetric meters.
Most models of Coriolis mass flow meters are relatively large in weight and volume.
expensive. The foreign price is 5,000 to 10,000 US dollars for a set, which is about 2 to 5 times that of the electromagnetic flowmeter of the same caliber. The domestic price is about 2 to 8 times that of the electromagnetic flowmeter.

Extended reading: U-series Liquid Mass Flow Meter | Liquid-slurry flow measure

Thermal mass flow meter

Thermal mass flow meters (TMF for short) are used to weigh thermal flow meters in China. It is to measure the mass flow of fluid by using the temperature field change generated when the fluid flows through the pipe heated by the external heat source. Or a flow meter that uses the relationship between the energy required to increase the temperature of the fluid to a certain value and the mass of the fluid when the fluid is heated to measure the mass flow of the fluid.
Generally used to measure the mass flow of gas. Has low pressure loss. The flow range is large. High precision, high repeatability and high reliability. There are no moving parts and it can be used for extremely low gas flow monitoring and control.

You may like:

**Z-Series Straight Tube Micro Motion Coriolis Flow Meter**

**T-series Triangle Coriolis Mass Flowmeter**

Read more about: Coriolis meter for High viscosity liquid

Sino-Inst offer over 10 Digital Mass Flow Meters, with Best Price.

A wide variety of Curved Digital Mass Flow Meters options are available to you, such as free samples, paid samples. All of our flow meters can wokrk with the AMS NEW TREX. About 13% of these are magnetic flow meter. 14% are Insertion Magnetic Flow Meter. 25% are Venturi flow meter. 13% are Handheld ultrasonic flow meter, and others are Liquid Turbine Flow Meters.

Sino-Inst is V-series Curved Digital Mass Flow Meter suppliers, located in China. Mass flow meter products are most popular in North America, Mid East, and Eastern Europe.

The United States, and India, which export 99%, 1%, and 1% of V-series Curved Digital Mass Flow Meter respectively.

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

KimGuo11

drurylandetheatre.com

T-series Coriolis Mass Flowmeter for Small Flow-High Viscosity Fluids

Posted on September 28, 2020 by KimGuo11

Coriolis Mass Flowmeter is suitable for measuring various non-Newtonian fluids, slurries, suspensions, high viscosity fluids and other media.

The T-series Triangle Coriolis Mass Flowmeter can directly measure the mass flow rate of the fluid in the closed pipe and the density of the medium. The T series Coriolis mass flowmeter has a triangular sensor structure. The smallest diameter can be DN3. This structure flowmeter is easy to measure when the instantaneous flow is small. The compact triangular shell structure saves installation space. The installation is simple and superior Downstream straight pipe requirements

Sino-Inst offers a variety of Mass flow meters for High Viscosity Liquids flow measurement. If you have any questions, please contact our sales engineers.

Request a Quote

Mass Flow Meters

Features of T-series Triangle Coriolis Mass Flowmeter

Triangular internal measuring tube design.
It can directly measure the mass flow of fluids. This is of great significance for the measurement and control of production processes such as energy metering and chemical reactions.
High measurement accuracy. The measurement accuracy can be guaranteed between 0.1% and 0.5%.
The measurable ratio is relatively large. Generally, the measurable ratio to ensure the basic accuracy is 10:1 or 20:1.
Wide application range. In addition to normal fluid measurement, it can also measure industrial media that are difficult to measure with general fluid measuring instruments, such as high-viscosity fluids, various slurries, suspensions, etc.
.Completely provide mass flow, volume flow, density, temperature measurement and calculation parameters. Reliable results can be obtained without tedious conversion, and volume tables can be directly replaced.
Compact triangular shell structure. Save installation space and simple installation. No upstream and downstream straight pipe section requirements
Simultaneously measure the instantaneous flow rate, cumulative flow rate, temperature, density
Direct measurement of fluid quality. The measurement accuracy is not affected by temperature, pressure, density, viscosity, without any compensation conversion
No need to re-calibrate when measuring fluid changes

Extended reading: Liquid mass flow controller for process liquid -Sino-Inst

Specifications of T-series Coriolis Mass Flowmeter

Sensor technical parameters:

(1) Sensor specification, range, zero stability:

Diameter (DN)	Flow Range	Zero stability
mm	kg/h	kg/h
3	0～96～144	0.0144
6	0～540～810	0.081
8	0～960～1440	0.144
10	0～1500～2250	0.225
15	0～3000～4500	0.45
20	0～6000～9000	0.9
25	0～9600～14400	1.44
32	0～18000～27000	2.7
40	0～30000～45000	4.5
50	0～48000～72000	7.2
80	0～120000～180000	18
100	0～192000～300000	30
150	0～36000	60

Note: The flow range gives two parameters, the middle parameter is the standard flow range, and the general factory inspection is carried out according to this range. At the same time, it is also recommended that the user choose the instrument within this range. The latter parameter is the upper limit flow to ensure the stable operation of the sensor scope.

(2) Flow (liquid) measurement accuracy

Flowmeter Accuracy	Measurement error	repeatability
0.10%	±0.1% ±(zero point stability/measured value)%	1/2 measurement error%
0.15%	±0.15% ±(zero point stability/measured value)%	1/2 measurement error%
0.20%	±0.2% ±(zero point stability/measurement value)%	1/2 measurement error%

(3) Density (liquid) measurement range and accuracy
Measuring range: 0.3～3.000g/cm3 Measuring accuracy: ±0.002g/cm3

(4) Temperature measurement range and accuracy
Measuring range: -200～350°C Measuring accuracy: ±1°C

(5) Working temperature of the measured medium: -200℃～350℃
Standard type: -50～200℃
Low temperature type: -200～200℃

(6) Applicable ambient temperature: -40℃～60℃

(7) Material: measuring tube 316L shell 304

(8) Working pressure: 0~4.0MPa
Note: The actual withstand voltage of the sensor varies from specification to specification, here is only the standard withstand voltage.

(9) Explosion-proof mark: Exd[ia]ⅡCT6Gb

Extended reading: What Is Difference Between Rotameter And Flow Meter?

Converter parameters

(1) Measurement parameters: mass flow, volume flow, medium working density, medium working temperature
Display: double-row LED display, three-row LCD display
Window size: 62×32mm (W×H) (Φ80mm)
Measurement display accuracy: 0.05%
Measurement display unit: mass flow g/h, kg/h, t/h, g/m, kg/m, t/m
Volume flow cm3/h, dm3/h, m3/h, cm3/m, dm3/m, m3/m
Density kg/m3 or g/cm3
Temperature °C, K, °F

(2) Converter output signal

Converter output signal: 0~10000Hz pulse signal
Flow signal Collector open circuit signal 4～20mADC current signal
Flow, density output signal choose one of the current output load capacity: not less than 750 ohms (24VDC power supply)

Note: Two current signals can be provided as required

Output signal accuracy: pulse signal 0.05%
Current signal 0.2%
Communication signal: RS485 MODBUS protocol

(3) Operating ambient temperature -40～60℃
Power supply 18～36VDC Power supply: 7W (basic power supply)
85～265VAC power supply: 10W (additional power supply)

(5) Instrument protection and explosion-proof protection level: IP67
Explosion-proof grade: Exd[ia]ⅡCT6Gb\Exd [ib]ⅡCT6Gb

(6) Structural size and weight Φ125×180mm, 2.7kg

Coriolis Mass Flowmeter Working Principle

The principle of Coriolis mass flowmeter mass measurement is Newton’s second law F=Ma. When the fluid flows in the vibrating tube, it will produce Coriolis force proportional to the mass flow.

When there is no fluid flowing, the vibrating tube will not be twisted, and the signals detected by the electromagnetic signal detectors on both sides of the vibrating tube are in phase.

When fluid passes by, the vibrating tube will be twisted under the action of torque, and there will be a phase difference between the two detectors.

The transmitter measures the lag time between the left and right detection signals. This time difference is multiplied by the flow calibration coefficient to determine the mass flow.

The density measurement principle of Coriolis mass flowmeter is that the vibration frequency is inversely proportional to the square root of the fluid density. The fluid density is determined by measuring the vibration frequency.

Therefore, the mass flow meter can realize the measurement of fluid mass flow and the measurement of fluid density.

How does a T-series Triangle Coriolis Mass Flowmeter measure mass flow and density?

Coriolis mass flow measurement is the MOST ACCURATE FORM for a flow measurement for a wide range of industrial processes. Each Coriolis flowmeter has one or more measuring tubes.

As soon as the fluid starts to flow in the measuring tube, additional twisting is imposed on this oscillation due to the fluid’s inertia. Two sensors detect this change of the tube oscillation in time and space as the “phase difference.”
Phase difference= mass flow
Oscillation frequency= density

The so-called high-viscosity liquid means that the liquid is viscous and thick, which is not only different from ordinary liquids, but also different from non-Newtonian fluids (mud, paper 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.

High Viscosity Flow Measurement is a Tough Job.

The property that generates the above-mentioned internal friction force when the fluid flows is called viscosity, and the physical quantity that represents the magnitude of viscosity (the magnitude of frictional resistance generated when the molecules inside the liquid move relative to each other) is called viscosity.

The greater the viscosity of the fluid, the worse the fluidity of the fluid.

For example, the viscosity of oil is greater than that of water, and the fluidity of oil is worse than that of water. The honey has a high degree of staining and is difficult to flow. For honey, screw pump products can be used. The viscosity of fluid is of great significance to the study of fluid flow, heat and mass transfer processes.

The physical meaning of viscosity is the size of the internal friction force generated by the fluid viscosity on the single value area when the fluid is caused to produce a unit velocity gradient (l/s). Therefore, the viscosity of the fluid is only displayed when it is in motion.

The greater the viscosity of the fluid, the greater the internal friction when flowing at the same speed. In other words, the greater the viscosity of the fluid under the same flow, the greater the resistance of the fluid and the greater the head loss of the fluid. . Therefore, in order to reduce the head loss, a lower flow rate should be used for fluids with human viscosity.

Extended reading: U-series Liquid Mass Flow Meter | Liquid-slurry flow measure

Oval gear flow meters and Coriolis mass flow meters can be used for high viscosity liquids.

The oval gear flowmeter is a positive displacement flowmeter. It has high accuracy for the measurement of malignant liquids, such as the flow of viscous fructose syrup.

Coriolis flowmeters have excellent performance in various types of media measurement, and now our customers often request them.

Sino-Inst is a supplier of high-viscosity fluid flow meters from a Chinese manufacturer. Welcome to contact us to get the low prices of these flow meters.

Extended reading: LCD Display Oval Gear High Viscosity Flow Meter

It is the most convenient choice to measure high viscosity liquid with ultrasonic flowmeter.

1. The ultrasonic flowmeter sensor converts electrical energy into ultrasonic energy and emits it into the fluid to be measured. The receiver receives the ultrasonic signal, which is amplified by the electronic circuit and converted into an electrical signal representing the flow rate to the meter for display.

2. The main thing is that it can be installed outside the pipeline. Do not touch the measured fluid. It is not affected by fluid temperature, pressure, viscosity, density, etc., so it fully meets your above requirements.

3. Because it is ultrasonic, the accuracy is not very high, generally 1%. Compared with some flowmeters on the market, it has fewer failures and easier maintenance.

Coriolis Mass Flowmeter is suitable for measuring various non-Newtonian fluids, slurries, suspensions, high viscosity fluids and other media.

The advantages of mass flow meters are:

The time difference has a linear relationship with the measurement effect;
Direct measurement of mass flow;
The measuring instrument can additionally detect fluid density ρ and medium temperature T;
The measurement results have high accuracy (typical accuracy: mass flow is ±0.1% (relative error of indication) + ±0.005% of the end value; density ρ is ±0.5kg/m³; △T is ±0.05% ( Relative error of indication) +5℃;
The measurement result has nothing to do with pressure and temperature;
The measurement result has nothing to do with the performance of the fluid (density, viscosity, electrical conductivity and thermal conductivity);
The measurement result has nothing to do with the flow velocity distribution, that is, no special inlet guide pipe is required. The flowmeter can measure the true average mass flow rate. There is no need to apply back pressure at the outlet end, and no outlet guide pipe is needed;
The installation location can be selected arbitrarily;
Two-way measurement can be performed;
All pressurized media can be measured, such as liquid and gaseous media. Especially polluted and corrosive media;
Because there are no moving parts. Therefore, the flowmeter does not require maintenance and has high working reliability;
The usable temperature range of the flowmeter is wide (-240℃～+426℃), and the pressure can reach 39.3 MPa.

Extended Reading: Rotameter vs Flow meter

In addition to the above-mentioned numerous advantages, there are also shortcomings;

The flowmeter is expensive;
The measuring pipeline with complex geometry increases the pressure loss;
In addition to single straight pipes, some flow meters have many elbows, which are difficult to clean and have poor self-emptying ability;
Pay attention to their compatibility between the material of the measuring pipe and the measured medium;
The maximum flow rate that can be measured is 680T/h;
Strong vibration and shock will affect the mechanical device of the flow meter, and will produce larger measurement errors in severe cases;
The installation of some flow meters is restricted by installation regulations;
A flow meter with a flow distributor will produce larger measurement errors when measuring uneven media;
The measurement of high viscosity media requires additional excitation energy and special calibration.

Extended reading: Liquid Mass Flow Meter

The oval gear flowmeter has high measurement accuracy and is suitable for measuring the flow of high-viscosity media. But it is not suitable for fluids containing solid particles. If the measured liquid medium contains gas, it will also cause measurement errors.

Usually, the accuracy of the oval gear flowmeter can reach 0.5 level, which is a relatively accurate flow meter. However, if the flow rate of the measured medium is too small during use, the leakage error of the oval gear flow meter will be prominent. Sufficient measurement accuracy can no longer be guaranteed.

Technical features and advantages of oval gear flow meters:

Oval gear flowmeter is also called fixed displacement flowmeter, or PD flowmeter for short. It is a kind of high precision in the flow meter, especially suitable for the measurement of high viscosity medium flow. Oval gear flow meters use mechanical measuring elements to continuously divide the fluid into a single known volume. The total volume of fluid is measured according to the number of times that the metering chamber is filled and discharged with this volume of fluid successively and repeatedly.

The flow measurement has nothing to do with the flow state of the fluid. This is because the oval gear flowmeter relies on the pressure head of the measured medium to push the oval gear to rotate for measurement.

The greater the viscosity of the medium, the smaller the leakage from the gear and the metering gap. Therefore, the larger the sticky skin of the nuclear test medium, the smaller the leakage error, which is more beneficial to the measurement.

The oval gear flowmeter has high measurement accuracy and is suitable for measuring the flow of high-viscosity media. But it is not suitable for fluids containing solid particles (solid particles will jam the gear, so that the flow cannot be measured). If the measured liquid medium contains gas, it will also cause measurement errors.

Limitation of Gear Flowmeter

Poor choice for medium for water, because the carbon steel wet material can rusty, also an increase in fluid slippage.
The flow meter is really bully and heavy, increase a lot shipping charges when delivery
Relatively high price cost for large gear flow meter sizes for stainless steel material.
Not good for the multi-phase fluids flow measurement such as used as Refrigerant flow meter.
More moving parts needs maintenance compared ,it can be destroyed by flow surges and gas slugs

To measure high-viscosity fluids, you can use differential pressure flowmeters or ultrasonic flowmeters to measure. Such as V-cone flowmeters, balanced flowmeters, orifice flowmeters can all be solved, no matter how high the viscosity is, it will not affect .

**V-series Curved Digital Mass Flow Meter**

More Featured Flow Meters

Z-Series Straight Tube Micro Motion Coriolis Flow Meter

Posted on September 28, 2020 by KimGuo11

Micro Motion Coriolis Flow Meter is a flow meter made according to the Coriolis acceleration theory. Z-Series Straight Tube Micro Motion Coriolis Flow Meter simultaneously measures mass flow, density, temperature and viscosity.

The Z-Series Straight Tube Micro Motion Coriolis Flow Meter can directly measure the mass flow rate of the fluid in the closed pipe and the density of the medium. No front/rear straight pipe length requirements. The measurement principle is completely unaffected by the physical properties of the fluid and the flow field. Can measure various liquid and gas flow.

Features of Z-Series Straight Tube Micro Motion Coriolis Flow Meter

General measuring principle for liquids and gases
Multivariable measurement: simultaneous measurement of mass flow, density, temperature and viscosity
High measurement accuracy: typical value is ±0.2% o.r.; optional: ±0.1%
The measurement principle is completely unaffected by the physical properties of the fluid and the flow field
No front/rear straight pipe length requirements
Wide measuring range: 1:10, 1:20
Straight pipe structure, small pressure loss, small sensor volume and light weight
The sensor has self-flow performance, easy to drain and easy to clean
High working frequency, not easy to be interfered by external industrial vibration frequency, adapt to harsh working conditions
Small installation space, not affected by installation conditions and process engineering
High measurement accuracy and good stability
No elbow parts, low wear and long working life

Straight Tube Micro Motion Coriolis Flow Meter Specification

Liquid Accuracy / Repeatability	up to ±0.2± of rate (up to ±0.1± of rate)
Gas Accuracy / Repeatability	±0.20± of rate
Density Accuracy / Repeatability	±0.002 g/cm3 (±0.0005 g/cm3)
Line Size	1/4″ (DN8) – 2″ (DN50)
Pressure Range	up to 1450 psig (100 barg)
Temperature Range	-60 to 300 F (-51 to 149 C)

Micro Motion Coriolis Flow Meter Applicaitons

Micro Motion Coriolis Flow Meter can be monitored in the following areas to meet the needs of its ingredients, mixing processing and commercial metering:

Chemical industry, such as systems with chemical reactions
Petroleum industry, such as moisture content analysis
Oil industry, such as vegetable oil, animal oil and other oils
Pharmaceutical industry
Paint industry
Paper industry
Textile printing and dyeing industry
Fuel industry, such as oil, heavy oil, coal water slurry and other fuels, lubricants
Food industry, such as dissolved gas drinks, health drinks and other liquids
Transportation industry, such as the metering of liquids in pipelines

Micro Motion Coriolis Flow Meter Working Principle

The micro-motion mass flowmeter is a flowmeter made according to the Coriolis acceleration theory. There is a straight tube that rotates in a plane around a fixed axis O at an angular velocity w, and a particle in the tube moves outwards along the straight tube at a speed v. Because The mass point m is in a system with both rotational motion and linear motion, so it will obtain two accelerations.

Serving size:

① Centripetal acceleration a, its value is rw^2 (r is the distance from the particle m to the axis O), and the direction points to the axis O.
② Tangential acceleration ac, its value is 2uw. The direction is perpendicular to a, it comes from the rotating pipe. At the same time it produces a reaction force to the pipe. This reaction force is the Coriolis force. Its calculation formula is:

F=2muw —————-(3-8)

Where:
F is Coriolis force, N;
w is the angular velocity, 1/s;
u is the radial velocity in the rotating system, m/s,
m is the mass of the moving object, kg.

If the density of the fluid is p, the tangential Coriolis force on any section of pipe △x is:

△F=2pA△xuw ———(3~9)

Where:
A is the cross-sectional area of the pipe.

In the formula (3-9), pAu is the natural flow rate of the fluid, set as QM’, then the formula (3-9) can be expressed as:

△F= 2w△xQm————-(3-10)

From the above equation, we can know the mass flow Qm as long as the Coriolis force △F is measured. This is the measuring principle of micro-motion mass flowmeter.

Read more about: Coriolis meter for High viscosity liquid

More Featured Flow Meters

Sino-Inst, Manufacuturer for Micro Motion Coriolis Flow Meters.

Z-Series Straight Tube Micro Motion Coriolis Flow Meter simultaneously measures mass flow, density, temperature and viscosity.

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

KimGuo11

drurylandetheatre.com

Mass Flow Meters

Posted on September 28, 2020 by KimGuo11

Mass flow meter directly measures the mass flow of the medium passing through the flow meter. It can also measure the density, temperature and viscosity of the medium

Mass flow meter is a flow measuring instrument that measures the mass flow in the pipeline. The volume of a fluid is a function of fluid temperature and pressure and is a dependent variable. The quality of a fluid is a quantity that does not change with time, space temperature, and pressure.

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

Request a Quote

More Flow Meters

Featured Mass Flow Meters

Featured Mass Flow Controllers

Mass Flow Meter Types

Mass flow meters can be divided into two categories:
One is the direct type, which directly outputs the mass flow. Coriolis mass flow meters and thermal gas mass flow meters are direct mass flow meters.

The other type is indirect or deduced. By using the relationship between fluid density, temperature and pressure, the flow meter that calculates the fluid mass is an indirect mass flow meter. Such as application of ultrasonic flowmeter and density meter combination. Multiply their output to get the mass flow rate.

Direct

There are many types of direct mass flow meters, such as calorimetric, angular momentum, gyro and double impeller. This kind of instrument is suitable for measuring small flow gas, the disadvantage is that it is inert. The measured value is related to the specific heat of the gas at a constant pressure. The measuring element is in contact with the medium and is easy to be contaminated and corroded.

Indirect

There are 3 main types of indirect mass flow meters:
Combination of velocity flow meter and density meter.
Combination of throttling (or target) flowmeter and positive displacement flowmeter.
Combination of throttling (or target) flowmeter and density meter.

There is also a method that converts the measured value of a volumetric flowmeter into a volumetric flow rate in a standard state according to the working pressure and temperature of the fluid.
However, when the type or composition of the medium changes, it cannot give an accurate mass flow. Strictly speaking, it is not a mass flow meter. Output density, specific gravity, volume flow, mass flow, mass energy flow, etc. It has multiple functions such as indication, analog output, printing, over-limit alarm, and instrument failure alarm.

Thermal

The basic principle of thermal mass flowmeter is to use an external heat source to heat the measured fluid in the pipeline. Heat energy flows with the fluid. The mass flow rate of the fluid is reflected by measuring the change in heat (temperature) caused by the fluid flow.

Differential pressure

The differential pressure mass flowmeter is a flowmeter based on the Magnus effect. In practical applications, the mass flow measurement is realized by the combination of orifice plate and quantitative pump. There are two common structures: double-hole plate and four-hole plate combined with quantitative pump.

Coriolis

Coriolis mass flowmeter (Coriolis flowmeter for short) is an instrument that directly measures mass flow by using the principle that fluid flows in a vibrating tube to produce Coriolis force proportional to mass flow.

The structure of Coriolis flowmeter has many forms, generally composed of vibrating tube and converter. The vibrating tube (measurement pipe) is a sensitive device. There are several shapes such as U shape, Ω shape, ring shape, straight tube shape and spiral shape. There are also methods such as double pipes, but the basic principle is the same.

More about Mass Flow Meters from Wikipedia.

Guess you like: Gas Mass Flow Meter

Mass Flow Meter Price

First, mass flow meters are slightly more expensive than ordinary volumetric flow meters. As a manufacturer of mass flow meters. Sino-Inst hopes to provide more users with high-quality products at the best price. The price of mass flow meters is mainly affected by the following aspects:

The price of mass flow meter is based on
Caliber specification requirements,
Electrode material is selected for the corrosive medium,
The selected lining material,
The body material is sprayed with stainless steel or carbon steel,
Different specifications and material choices have different prices.
In terms of installation method, flange integrated installation or split installation, plug-in installation or clamping installation, etc., the price is different depending on the form.

Extended reading: Mass Flow Rate vs Volumetric Flow Rate

More Featured Flow Meters:

Sino-Inst offer over 50 Mass Flow Meters with Best Price.

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

Sino-Inst is Mass Flow Meters suppliers, located in China. Mass 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 Magnetic Flow Meters respectively.

KimGuo11

drurylandetheatre.com

V-Cone Flow Meter

Posted on September 27, 2020 by KimGuo11

V-cone flow meter is also known as cone-type flow meter; inner cone flow meter; integrated V-cone flow meter. The principle of V-cone flow meter is the same as other DP flow meters, and it is also a throttling DP flowmeter.;

The basic principle of the V-cone flow meter is the same as that of other types of differential pressure flowmeters. They are based on the principle of energy conservation in the sealed pipeline. The V-cone flow meter is a cone-shaped shutoff piece suspended in the center of the pipeline, and the cone-shaped piece hinders the flow of the medium. Reshape the flow rate curve. Measuring media include water, steam, air, natural gas, nitrogen, coke oven gas, etc. The maximum working temperature is 450℃, and the maximum pressure is 40Mpa.

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 V-Cone Flow Meter

Low installation requirements. The first 0～3D straight pipe, the rear 0～1D straight pipe section;
Wide range ratio. It is usually 10:1, and it can be up to 50:1 by selecting appropriate parameters;
The pressure loss is small. For the same β value, the pressure loss is 1/3～1/5 of the orifice;
Wear resistance. After the streamlined cone is throttled, a vacuum layer effect is produced on the surface of the cone, making the cone not easy to wear;
No clogging, no adhesion. The conical thorough purging design avoids the retention of residue, condensate or particles in the fluid;
Long-term stability is good. β value can be unchanged for a long time, and long-term accurate measurement is guaranteed;
High accuracy: 0.5 level;
Good repeatability. Better than 0.1%;
The signal is stable. “Signal fluctuation” is 1/10 of the orifice;
Wide β value range. The unique geometry of the V-cone flow sensor allows a wide β value range;
Wide range of caliber: DN25～DN2000;
Measurable high-temperature and high-pressure media: the maximum working temperature is 850℃, and the maximum pressure is 40MPa;
Can detect dirty media (coke oven gas, blast furnace gas, raw oil, residual oil, etc.);
Measurable gas-liquid two-phase medium (humidity, condensate, etc.);

V-Cone Flow Meter Specification

Long-term stability:	± 0.1% F.S / Y
Output:	4~20mA
Repeatability:	± 0.1%
Minimum flow velocity:	0.1m
Turndown ratio:	Normally15:1; max50:1
Reynolds number range:	8 × 103 ~ 5 × 106
Operating pressure:	≤ 16MPa, 42MPa(maximum)
Operating temperature:	-160 °C ~ 700 °C
Nominal diameter:	φ15~φ2000 (1/2″~120″)
Environment temperature:	≤ 80 °C

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

V-Cone Flow Meter Applications

V-Cone Flow Meter can successfully measure fluids:

Gas:
Gas: coke oven gas, blast furnace gas, city gas;
Natural gas: includes natural gas with a moisture content of more than 5%;
Various hydrocarbon gases: alkanes, olefins and other gases;
Various gas production: hydrogen, helium, argon, oxygen, nitrogen, etc.;
Corrosive gas: wet chloride gas, etc.;
Air: including air containing water, dust, compressed air, etc.;
Flue gas: flue gas discharged from various boilers and heating furnaces;
Steam: saturated steam, superheated steam;
Liquid
Oils: crude oil, fuel oil, water-containing emulsified oil, diesel, hydraulic oil, etc.;
Water: raw water, drinking water, production water, sewage, etc.;
Various aqueous solutions: acid, alkali, saline solution, etc.;
Organic chemicals: methanol, ethylene glycol, xylene, etc.;
Special fluid
Oil + HC gas + sand;
Aerated water: H2O+N2+air; H2O+CO2, etc.;

Extended reading: Flow Measurement of Nitrogen

veris flow measurement group

Armstrong International’s Veris – Flow Measurement solutions provide outstanding flow measurement technology to meet the critical needs for your environment. Their Verabar and Accelabar patented solutions deliver consistent, accurate and reliable flow measurement to handle a wide variety of liquids, gases and steam.

The metal Rotameter flow meter is suitable for the flow measurement of small-diameter and low-velocity media. It can measure most media such as gas and liquid.

The metal Rotameter flow meter can measure the instantaneous flow and cumulative flow of gases and liquids, including corrosive acid, alkali, and salt solutions. It is especially preferred when the flow is low or when a purely mechanical or inconvenient power supply is required.

Rotameter flow meters are mostly vertical installation, bottom entry, and top exit type, and can also be installed horizontally. The price is higher. Let me show you a sample.

This is an explosion-proof type for measuring corrosive liquids.

This is a smart type. It can measure gas and liquid. There should be no impurities.

This one is installed horizontally to measure nitrogen. It is purely mechanical to display instantaneous flow rate.

V-Cone Flow Meter Working Principle

The V-cone flow meter is a differential pressure flow meter. The flow meter designed on the principle of differential pressure has been applied for more than 100 years.

The principle of differential pressure is based on the principle of energy conversion in a sealed pipeline. That is to say, for a stable fluid, the flow rate is proportional to the square root of the flow rate of the medium in the pipeline.

When the medium is close to the cone, its pressure is P1. When the medium passes through the intercepting area of the cone, the speed increases and the pressure decreases to P2. Both P1 and P2 are led to the differential pressure transmission through the tapping port of the cone flowmeter When the flow rate changes, the differential pressure between the two pressure taps of the cone flowmeter will increase or decrease.

The calculation formula used by the V-cone flow meter for flow calculation is the same as other differential pressure flow meters. However, the unique design of its intercepting element forces the medium in the center of the pipeline to flow around the cone. Compared with other differential pressure flowmeters. There are many advantages.

We can understand the performance of the cone flowmeter with the help of the ideal flow rate curve distribution. The fluid in the pipeline is not disturbed or hindered, which is what we call the ideal flow state. Its flow velocity is evenly distributed, and the flow velocity near the pipe wall is almost zero.

The flow velocity in the center of the pipe reaches the maximum. The flow velocity near the pipe wall is almost equal to Zero. It is caused by the friction of the pipe wall against the medium. Because the cone is suspended in the center of the pipeline, it is directly in contact with the high-speed area of the fluid, forcing the fluid in the high-speed area to mix with the fluid in the low-velocity area near the pipe wall to make the flow rate uniform.

Therefore, even if the flow rate is very low, the cone flowmeter can still make the fluid and the highest flow rate in the center of the pipe continuously interact to produce the correct differential pressure.

V-Cone Flow Meter Calculation

The simplified formula is:

Where:
QV-fluid volume flow m³/h
Cd-outflow coefficient
βV—Equivalent diameter ratio
dV—is the maximum diameter of the cone, D is the inner diameter of the pipe
ρ—Density under fluid conditions
ε-gas expansion coefficient

In reality, it is difficult to distribute the flow rate uniformly, and any changes in the pipeline may affect the fluid. Such as: bay head, valve, reducing diameter, expanding diameter, pump, tee, etc. The cone flowmeter uses a cone to reshape the upstream flow velocity distribution curve. Even in extremely harsh conditions, measurement accuracy can still be guaranteed.

Extended reading: [Working principle&Price]SI3051ANB Annubar Flow Meter

If the medium has particulate impurities, it is easy to block.
The pressure loss is the largest in the non-movable components such as electromagnetic, vortex, thermal, and Vera, and the flowmeter based on the principle of non-orifice plate. There will be about 10~20% pressure loss. The pressure loss will be even greater if several sets are used on one pipeline.
If the V-cone flow meter is broken, it must be removed. Downtime for many businesses is troublesome.
Because it is a differential pressure type, pressure and temperature compensation are required. And these two compensation probes are more prone to damage than the flowmeter.
The range ratio of v-cone flowmeter is small, generally 1:10, good to 20. The electromagnetic energy generally reaches 100. Except for electromagnetic and thermal, other flowmeters have a lot of drop in measurement accuracy on small flow, or even can not measure.

V-Cone Flow Meter Installation

1.Pipeline flange type:

Refers to the installation flange at both ends of the flowmeter. It is connected with the installation flange (also called user flange) of the same specification at both ends of the process pipeline. It is a more commonly used structure.

The applicable caliber (DN50mm～3000mm). This form is suitable for split installation of throttling device and differential pressure transmitter. It is generally used when measuring steam flow. It can also be used when measuring other high-temperature media.

2.Flange clamping type:

Used for the installation of small-mouth flow meters. Only 2 flanges are required for each flowmeter process pipeline. The flange and the process pipeline are welded together. Then clamp the flowmeter between the two flanges. The installation method here is the same as that of the vortex flowmeter (≤300mm).

3.Small-caliber integrated type:

Suitable for fluids with a diameter of ≤DN40mm and a medium temperature of ≤120℃. The structure is to directly combine the differential pressure transmitter with the tower flow meter into a whole.

There is no pressure guiding tube, pressure taking valve, three valve group between the two. Make the installation very simple (the same as the vortex flowmeter installation method). When the differential pressure transmitter adjusts the zero point, the valve of the process pipeline needs to be closed, and then the zero can be adjusted.

Note: This installation method cannot be used to measure high-temperature media. It is because the high-temperature media will enter the measuring room of the differential pressure transmitter and damage the measuring diaphragm of the transmitter.

4.Pipeline butt welding type:

Refers to the tower flowmeter and the process pipeline cannot be connected by flange (the flowmeter body cannot be flanged). The flowmeter and the process pipeline are directly welded together during installation. The cost of this structure is relatively low (the cost of 4 flanges is reduced), and it is a one-time installation. Generally used in larger diameter occasions.

5.Conventional fluid integration type:

Refers to the fluid whose medium temperature is ≤120℃. Applicable pipe diameter: DN50～DN3000. According to different fluids and user requirements, the manufacturer welds (or assembles) valves and three-valve groups on the flowmeter before leaving the factory. The user can assemble the flowmeter and transmitter together when installing on site.

6.Steam integrated type:

It means to assemble the transmitter and the tower flowmeter together when measuring the steam flow. Between the transmitter and the flowmeter, we must assemble the “three-valve group dedicated for steam” of our company. So cancel The pressure guiding tube is greatly simplified and the pressure taking structure is greatly simplified.

7.Liquid antifreeze type:

Refers to the “liquid special isolation tank” installed by our company between the tower flowmeter and the transmitter. The tank contains a special medium, which can not freeze at a lower temperature. This installation method is used when measuring liquids, especially when the outdoor environment is relatively low. The liquid in the measuring chamber of the transmitter is easy to freeze and damage the transmitter.

8.Square pipe flange type:

Refers to the process pipe is a square pipe. The flow meter measuring pipe is a round pipe. The two are connected by a special “square-circle” connector.

Flange, clamp connection type

The V-cone flow sensor is a straight pipe section with flanges. The v-cone is placed inside the tube. Weld the same flange on the process pipe and assemble it with the v-cone flow sensor.

When the V-cone flow sensor is installed on a vertical pipe, the fluid should flow from bottom to top. Since the positive and negative pressure inlets are not on the same level, necessary corrections should be made to their heights.

Diameter range	Throttle	upstream	downstream
All	1 elbow	1D	1D
	2 elbows	1D	1D
	tee joint	1D	1D
	Butterfly valve (control valve)	10D when not ideal	5D downstream of valve
	Butterfly valve (stop valve)	5D	3D
	Ball valve (cut-off)	1D	1D
	Heat exchanger (depending on type)	1D	0D
	Expanding tube (0.67D-D) length 2.5D	2D	2D
	Reducer (3D-1D) length 3.5D	1D	1D

Welding type

The V-cone flow sensor can be permanently welded in the pipeline as a part of the pipeline because of its very good wear resistance and the fluid purging around the V-cone, making it self-cleaning.

Requirements for upstream and downstream straight pipe sections:
Gas measurement, Reynolds number range (Re) > 200,000, β value greater than or equal to 0.65

Requirements for upstream and downstream straight pipe sections:
Liquid measurement, Reynolds number range (Re)≤200,000, β value greater than or equal to 0.65

Diameter range	Throttle	upstream	downstream
All	1 elbow	1D	1D
	2 elbows	1D	1D
	tee joint	1D	1D
	Butterfly valve (control valve)	3D in less than ideal locations	Valve Downstream 3D
	Butterfly valve (stop valve)	3D	3D
	Ball valve (cut-off)	0D	0D
	Heat exchanger (depending on type)	0D	0D
	Expanding tube (0.67D-D) length 2.5D	1D	1D
	Reducer (3D-1D) length 3.5D	1D	1D

Frequently
Asked
Questions

Help Center

V-cone flowmeter, also known as; V-cone flowmeter; V-cone flowmeter; Cone flowmeter; Cone flowmeter; Inner cone flowmeter; Inner cone flowmeter.

Integrated V-cone flowmeter V-cone flowmeter (V-cone flowmeter) is a differential pressure flowmeter developed in the 1980s. Its successful development is a qualitative leap in differential pressure flow measurement.
It uses the throttling effect produced by the V cone in the flow field to measure the flow by detecting the upstream and downstream pressure difference.
V-cone flowmeter is mainly used for flow measurement of liquid, gas and steam. V-cone flowmeter is divided into two forms: integrated and split.

If you want to divide the flow meter into three categories. I think it can be divided into volumetric flowmeters, mass flowmeters, and velocity flowmeters.

There are differences in the measurement accuracy of commonly used flowmeters, as follows.

Mass flowmeter 0.05%, positive displacement flowmeter 0.25～0.5, electromagnetic flowmeter 0.25～1.0, turbine flowmeter 0.15～0.5, vortex flowmeter 0.1.5, ultrasonic flowmeter 0.1.0 (multi-channel is better than 0.5) , Orifice plate, V cone, uniform velocity tube flowmeter 1 to 1.5, nozzle 0.10.

Both the accuracy and error of a flowmeter characterize the ability of a measuring instrument to approximate the actual true value of the measurement results. The higher the accuracy of the instrument, the closer the measured value is to the actual true value. The higher the accuracy, the smaller the error.

Therefore, the accuracy of the mass flowmeter is currently the highest.

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Sino-Inst offers over 10 V-cone flow meter products. These are differential pressure flow meters, 40% are water meters (like the Insertion Turbine Flow Meter), and 40% are water treatment (like the Annubar flow meter ).

A wide variety of V-cone flow meter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of V-cone flow meter, located in China. The top supplying country is China (Mainland), which supply 100% of the V-cone flow meter respectively.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. V-cone 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.

KimGuo11

drurylandetheatre.com

Wedge Flow Meter

Posted on September 25, 2020 by KimGuo11

Wedge flow meter is a differential pressure flow meter. The detection part is a V-shaped wedge (also called a wedge-shaped throttle).

Wedge flowmeter is a new type of throttling differential pressure flow measuring instrument. The wedge flowmeter can perform high-precision flow measurement in fluids with high viscosity and low Reynolds number (Reynolds number 500 can be used). It has unparalleled advantages in flow measurement occasions with low flow rate, small flow and large pipe diameter. Except for general gas, liquid and steam, it is especially suitable for flow measurement of high-viscosity, dirty liquid and high-dust gas.

Get a Quote DP Flowmeters

Features of Wedge Flow Meter

High accuracy, good stability and good repeatability. Measurement error: ±0.5%F.S; long-term stability: ±0.1%F.S/Y.

Simple structure, high reliability and long service life. The unique structure of the wedge flow sensor, the configuration of the high-performance differential pressure transmitter, and the strict degree of testing, testing and standardization. The service life can reach more than 10 years.

Wide measuring range. The range ratio is generally 1:25, up to 1:33. When the differential pressure of the differential pressure transmitter is changed, it can reach more than 1:100

The scope of application is extremely wide. It is not only suitable for single-phase fluids, but also for two-phase fluids such as gas-liquid, gas-solid and liquid-solid. Its Reynolds number can be as small as 300 and as high as 1×107. The wedge flow meter can work in the state of measuring flow or in the state of turbulent flow, and its lowest flow rate is 0.01m/s. It is suitable for the flow measurement of various liquids, gases, steam and high dust-containing gases such as high temperature, high pressure, high viscosity, heavy corrosion, easy crystallization, suspended solids, long fibers, etc.

Anti-adhesion, no deposition, no clogging. The anti-adhesion structure design of the wedge-shaped sensor measuring tube and the throttling piece eliminates the adhesion and accumulation of sand, dust, suspended solids, and fibers in the measured medium to the flow sensor measuring tube. At the same time, the corrosion of the measuring tube is prevented, thus ensuring the long-term constant of the measuring tube diameter and the long-term standard of flow measurement.

Integration. Integrated installation of wedge sensor, three groups of valves and differential pressure transmitter. Eliminates the need for pressure guiding pipelines, valves, pipe fittings, and the entire system is simpler. The measurement accuracy and reliability are greatly improved.

Intelligent. When selecting the intelligent differential pressure transmitter, the process parameters can be set and configured through HART protocol or other communication methods. According to the change of the measured medium flow rate, the differential pressure is adjusted to greatly broaden the system range. When the intelligent multi-parameter differential pressure transmitter is selected, multi-parameter measurement (differential pressure, volume flow, mass flow, pressure, temperature) can be realized. Realize complete temperature and pressure compensation, and directly output accurate flow signals.

Low installation requirements for straight pipe sections. Low requirements for installing straight pipe sections can effectively avoid and reduce the additional measurement uncertainty of the measurement system.

The pressure loss is small, saving energy.

Read more about: Coriolis meter for High viscosity liquid

Specification of Wedge Flow Meter

Accuracy	0.5 grade, 0.2, 0.3, 0.4 grade precision negotiated order
Long-term stability	±0.2%F.S/Y
Repeatability	±0.2%
Suitable test medium	Various liquids, gases and steam
Minimum flow rate	0.01m/s
Measuring range	Generally 1:25, up to 1:33, when the differential pressure of the differential pressure transmitter is changed. It can reach more than 1:100
Pressure loss	Measure about 1/5 of the differential pressure (about 1/3 of the orifice plate)
Reynolds number application range	The lower limit is 500, the upper limit is less than or equal to 1×10 7 (when measuring under low Reynolds number, the range is relatively reduced, and the uncertainty of the outflow coefficient is relatively increased)
Measured liquid viscosity	500mpa.s, or higher
Working pressure range	-0.1~42MPa
Range of working temperature	-160℃~450℃ (up to 700℃ for special)
Applicable pipe size	DN10mm~DN1200mm (special up to 2500mm)
Wedge ratio h/d	0.2, 0.3, 0.4, 0.5
Differential pressure/pressure transmitter power supply	24VDC
Differential pressure/pressure transmitter output	4~20mADC (HART protocol can be selected)

Extended reading: Flat Pressure Sensor for High Viscosity Fluids

Wedge Flow Meter Applications

The wedge flow meter can successfully measure the following fluids;

Gas: coal gas, natural gas (including high-humidity natural gas and unclean natural gas containing other impurities). Air (including air containing water, solid particles and other suspended matter).
Steam: saturated steam, superheated steam.
Liquid:
- Oils (such as crude oil, fuel oil, coal tar, residual oil, paraffin oil, water-containing emulsified oil, water-containing sandy slop oil, etc.).
- Slurry (such as oil slurry, iron ore slurry, paper slurry, mud, coal Pulp, etc.).
- Water (such as: purified water, sewage, industrial wastewater, river source water containing silt and debris, etc.).
- Various aqueous solutions (such as: various acid, alkali, salt solutions with strong corrosiveness and easy crystallization , Solutions containing more suspended solids, etc.).
Special fluid.

Extended reading: [Working principle&Price]SI3051ANB Annubar Flow Meter

Wedge Flow Meter Working Principle

When the fluid flows into the flow tube, it is forced to accept the vertical movement of the flow tube. In the half cycle of the upward vibration of the flow tube, the fluid resists the upward movement of the tube and exerts a downward force on the flow tube.

On the contrary, the fluid of the wedge flow meter exerts an upward force on the flow tube to oppose the downward movement of the tube and reduce its vertical momentum. This causes the flow tube to twist. In the other half of the vibration cycle, the flow tube vibrates downwards and twists in the opposite direction.

It vibrates at its resonant frequency by driving the coil and the feedback circuit. The resonance frequency of the vibrating tube is related to the structure, material and quality of the vibrating tube. The quality of the vibrating tube consists of two parts: the mass of the vibrating tube itself and the quality of the medium in the vibrating tube.

After each sensor is produced, the quality of the vibrating tube itself is determined. The mass of the medium in the vibrating tube is the product of the density of the medium and the volume of the vibrating tube. The volume of the vibrating tube is fixed for each caliber sensor. Therefore, the vibration frequency is directly related to the density. For sensors that determine the structure and material, the density of the medium can be obtained by measuring the resonance frequency of the flow tube.

When using a wedge flow meter, if a small amount of gas flows in a stratified or wavy flow in the water pipe. The fault phenomenon is manifested as an increase in error, that is, the flow measurement value does not match the actual value.

If the flow is a bubble flow or a plug flow, the fault phenomenon is except that the measured value does not match the actual value. The output will fluctuate because the gas phase instantly covers the electrode surface.

If the cross-sectional area of the horizontal pipeline in the stratified flow increases in the gas phase. That is, the degree of liquid not full of the tube increases. There will also be output shaking, and the situation is more serious if the liquid is not full. If the liquid level is below the electrode, the output will be over-full.

Extended reading: V-Cone Flow Meter Applications

Wedge Flow Meter Calculation

Where qv—-volume flow meter, m³/s
C——Outflow coefficient;
ε—–Expansion coefficient;
m——throttling area ratio;
D——Inner diameter of pipe, m;
△p——Differential pressure, pa;
ρ——The density of the measured medium, kg/m³

The wedge flow meter has correction functions for parameters such as flow coefficient, non-linear error, temperature change, and density change. The measurement accuracy can reach 0.5%. Can have on-site display and standard current signal (4~20mA DC) output. It can be conveniently used in automatic control systems or networked with computers. Perform automatic adjustment and control of flow or other parameters.

Wedge flowmeter Vs V-cone flowmeter

The wedge flow meter is a new type of flowmeter that began to be practical in the 1980s. Its detection part is a V-shaped wedge (also known as a wedge-shaped throttling part), and its sleek top angle faces downward. It is conducive to the smooth passage of liquids containing suspended particles or viscous liquids, and no stagnant flow occurs on the upstream side of the throttle. Therefore, it is especially suitable for the measurement of volume flow and mass flow in petroleum and chemical industries.

Scope of application:

Suitable for measuring mud, coal tar pitch, coal water suspension and other high viscosity fluids;
In the case of a very low pipeline Reynolds number (even as low as Re=500), the square root relationship between flow and differential pressure can still be maintained. The minimum Reynolds number of the orifice flowmeter is much larger than that of the wedge flow meter;
Corrosive media can be measured. Because the differential pressure measurement uses a diaphragm type double-flange differential pressure transmitter, corrosive media cannot enter the pressure guiding tube and the differential pressure transmitter. Therefore, only the wedge-shaped throttling is processed by corrosion-resistant materials It can make the instrument measure corrosive media.

The V-cone flowmeter is a new type of differential pressure flow meter with high precision and high stability. Like other differential pressure meters, it is also based on the principle of flow continuity and Bernoulli’s equation to calculate the fluid flow rate.

Scope of application:

Because the V-cone flowmeter can uniform fluid distribution curve. Therefore, compared with other types of differential pressure flow meters, the requirements for the upstream and downstream straight pipe sections are small. It is recommended to leave 0-3D straight pipes upstream and 0-1D straight pipes downstream. When the user’s pipeline size is large, the pipeline price is high or the straight pipe section is not enough, the V-cone flowmeter will be the best choice.

So to sum up, there are differences in the scope of application of wedge flow meter and v-cone flowmeter. The former can maintain the square root relationship between flow and differential pressure at very low pipeline Reynolds number. The latter can be used when the pipe size is large or the straight pipe section is not enough.

Extended reading: What Is A Venturi Flow Meter?

You may like:

Sino-Inst offers Wedge Flow Meters.

A wide variety of Wedge Flow Meter options are available to you, such as brass, carbon steel. You can also choose from free samples.

Sino-Inst is Wedge 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.

KimGuo11

drurylandetheatre.com

Welding Orifice Plate|High pressure and High temperature flow meter

Posted on September 24, 2020 by KimGuo11

The high temperature flow meter is a welded orifice flow meter. Suitable for high temperature and high pressure steam flow and high pressure flow water measurement.

The nozzle of the temperature and high pressure welding orifice plate adopts the standards of the Ministry of Water Resources and Electric Power. The standard is (DG0700-DG0750). Welded integrated orifice plates for high temperature and high pressure are mainly used for measuring orifice plates for high temperature and high pressure steam flow and high pressure flowing water in power plants.

Get a Quote DP Flowmeters

Features of High pressure and High temperature flow meter

The experimental research and data accumulation are abundant, supported by national standards.
Wide range of differential pressure used.
The pipe diameter has a wide range of use.
The measurement accuracy is high and the range is wide.
It can be applied to various working conditions such as high temperature, high pressure and ultra-low temperature.
Can be applied to various materials.
Digital display on site, compatible with remote signal transmission.
It is suitable for a wide range of media, and can measure the flow of various liquids, gases and steam.
Simple manufacturing and convenient installation.
The pressure loss of the welded orifice plate is about half of the differential pressure.

Welding Orifice Plate|High pressure and High temperature flow meter Specification

Nominal diameter: 25mm≤DN≤2400mm
Nominal pressure: PN≤42Mpa
Working temperature: -50℃≤t≤550℃
Aperture ratio: 0.10≤β≤0.75
Reynolds number range: when 0.10≤β≤0.56, 5000≤ReD
When 0.45≤β≤0.75, 10000≤ReD
Accuracy: Class 1.0, Class 1.5, Class 2.0

Extended reading: Vortex Hygienic Flow Meter

More Featured High Temperature Flow Meters

Here we simply list the temperature of the following different types of high temperature flow meters:

Thermal mass flow meter ：max 300℃ (572℉)
Coriolis mass flow meter: max 350℃ (662 ℉)
Vortex flow meter: max 350°C (662 ℉)
Balanced flow meter: max 800℃（1472 ℉）
Magnetic flow meter :max 160℃ (320 ℉)
Liquid Turbine flow meter: max 150℃ (302 ℉)
Oval gear flow meter:max 200℃ (392 ℉)
Variable Area Flow Meter/Metal Tube Rotameter: max 300℃ (572℉)
Gas turbine flow meter: max 80℃（176℉）

Please note: high temperature flow sensor is customized ,not standard type. If you need to measure high temperature, please contact Sino-Inst sales engineer.

Extended reading: High Pressure Flow Meters for Liquids-Steam-Gas

Vortex Split High Temperature Flow Meter

The High Temperature Flow Meter uses a split signal converter. The way the vortex body is separated from the vortex converter. The Vortex Split High Temperature Flow Meter is suitable for high temperature, high pressure, safety and explosion-proof applications, where you need to watch the meter data on site. It is widely used in the measurement of steam, gas and liquid. And inconvenience Under complex conditions of reading data.

High temperature mass flow meter

The thermal gas mass flow meter is designed based on the principle of thermal diffusion, which uses the constant temperature difference method to accurately measure the gas. The sensor part consists of two reference grade platinum resistance temperature sensors. Thermal gases are widely used in factory compressed air, blast furnace gas measurement in ironworks, and monitoring and measurement of chimney flue exhaust.

Guess you like: Gas Mass Flow Meter

High temperature ultrasonic flow meter

The clamp-on ultrasonic flowmeter composed of wall-mounted host and clamp-on flow sensor can be widely used in various water treatment industries. Applied to online measurement of various liquid volume flow. The main unit and the sensor are installed separately: the sensor is installed on the pipeline, the wall-mounted main unit is installed indoors or in the instrument box, and the main unit and the sensor are connected with an ultrasonic special cable. It is currently the most widely used ultrasonic flowmeter.

High temperature water flow meter

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.

High temperature turbine flow meter

Liquid turbine flow meter is the main type of impeller type flow (velocity) meter. It is composed of sensors and conversion display. The sensor uses a multi-blade rotor to sense the average flow rate of the fluid, thereby deriving the flow or total amount. Liquid turbine flow meter is suitable for measuring liquids that are not corrosive to stainless steel 1Cr18Ni9Ti, 2Cr13 and corundum Al2O3 in closed pipelines and are free of impurities. For milk, soybean oil, edible oil, diesel, purified water.

High temperature air flow meter

You may have questions, what flowmeter can measure the air flow at ultra-high temperature?

For example, 800°C air.

Perhaps, you should use a V-cone flowmeter.

It is suitable for the measurement of various liquids, gases and steam under all working conditions and temperatures below 1330 degrees.

Extended reading: V-Cone Flow Meter Applications

Sino-Inst offers High pressure and High temperature flow meters.

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

Sino-Inst is High pressure and High temperature flow meter supplier. High pressure and High temperature 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.

KimGuo11

drurylandetheatre.com

Integral DP Flow Meter

Posted on September 24, 2020 by KimGuo11

DP Flow Meter includes throttling parts (eg. orifice plates), differential pressure transmitters, three-way valves. Used for flow measurement of various liquids, gases and steam.

Integral DP Flow Meter installs the throttle, differential pressure transmitter, three-way valve and accessories on the short process pipe. It is supplied as a whole after calibration. Reduce installation errors. Shorten installation man-hours. There is no need to connect additional pressure measuring points and temperature measuring points to make the output signal. Automatically realize temperature and pressure compensation to improve measurement accuracy.

Get a Quote DP Flowmeters

Features
Specification
Working Principle

Features of Integral DP Flow Meter

a. Measurement accuracy:

Because the integrated differential pressure flowmeter does not require a pressure pipe, the phenomenon of differential pressure distortion is reduced. It has higher accuracy than the split differential pressure flowmeter. For differential pressure flow meters that require real flow calibration. Because it is the flow calibration of the whole device. So the system accuracy can be improved by 0.3%.

b. Simple installation

The integrated differential pressure flowmeter only needs to be flanged or directly welded to the phenomenon pipeline. And directly lead to the current signal of the differential pressure transmitter. There is no need to lay additional pressure pipelines and install differential pressure transmitters.

Used to measure the flow of gas or steam. Due to the optional multi-parameter differential pressure transmitter. It can automatically monitor temperature and pressure changes and automatically trim the output signal. So there is no need to install additional temperature and pressure measuring elements. Greatly improve the installation progress.

c. Wide range ratio

The integrated differential pressure flowmeter with multi-parameter differential pressure transmitter is equipped with dynamic algorithm compensation. So the turndown ratio is greatly improved. The large range can reach 8:1.

d. Low purchase, installation and operating costs

The integrated differential pressure flowmeter does not need to lay additional pressure pipeline. And there is no need to heat the impulse pipeline. Therefore, the installation cost is greatly saved. Adapt to the severe cold area in winter or occasions requiring heat preservation.

For the integrated differential pressure flowmeter with multi-parameter differential pressure transmitter, it integrates temperature and pressure compensation. Therefore, the purchase cost of pressure and temperature transmitters is eliminated. Greatly reduce the cost of purchasing and installation.

e. Variety of forms

Because the primary element can use different forms of throttling devices. Therefore, as long as the appropriate integrated differential flowmeter is selected for various operating conditions. It can realize the accurate flow of any kind of complicated working conditions.

Extended reading: [Working principle&Price]SI3051ANB Annubar Flow Meter

Integral DP Flow Meter Specification

Pipe diameter (mm)	DN50-DN1000 optional
Measured medium	Single-phase fluid such as liquid, gas, steam (or can be considered as single-phase fluid)
temperature range	－40℃～450℃
Pressure range	2.5MPa (4.0MPa)
Throttle	Preferred fixed-value ISA1932 nozzles (the preferred serial number β20 for fixed-value aperture is 0.52 and 0.72), fixed-value orifice plate (the preferred serial number β20 for fixed-value aperture is 0.34, 0.52 and 0.72)
Pressure method	Angle joint pressure or flange pressure
Differential pressure transmitter	PMD230, 1151, 3051CD, 3095CD, EJA110A
Range	3:1, 6:1, 10:1, 10:1 or more
System uncertainty	±1.0%, ±1.5%, ±2.0%, ±2.5% (The accuracy of the system is affected by many factors. Our company can provide you with relevant consulting services)
Throttle material	1Cr18Ni9Ti, SUS316, others
Material of clamp	1Cr18Ni9Ti, SUS316, 20# steel, others
Power supply	Transmitter part 24VDC (20mA) Flow display equipment: 220VAC, 50Hz 24VDC
Explosion proof	iaⅡcCT2-T5 intrinsically safe explosion-proof
Transmitter output signal	4-20mA (communication connection requires a minimum load resistance of 250W)
Protection level	IP65
Allow vibration acceleration	£1.0g
Ambient temperature	－20℃～55℃ (please declare if it exceeds this range)
environment humidity	45%～85%
Atmospheric pressure	86～106kPa

DP Flow Meter Working Principle

The fluid filled with the pipe flows through the throttling device in the pipe, and the stream will form a local contraction at the throttling part. As a result, the flow velocity will increase and the static pressure will decrease. So a static pressure difference (or differential pressure) is generated before and after the throttling part.

The greater the flow rate of the fluid, the greater the differential pressure generated before and after the throttle. Therefore, the flow can be measured by measuring the differential pressure.

Knowing the relevant parameters. According to the principle of flow continuity and Bernoulli equation, the relationship between the differential pressure and the flow rate can be derived1 to obtain the flow rate. The basic formula is as follows:

c——outflow coefficient dimensionless

d——The diameter of the orifice or throat of the throttle under working conditions m

D——Inner diameter of upstream pipe under working conditions m

qm——mass flow kg/s

qv——Volume flow m3/s

β-diameter ratio d/D dimensionless

ρ——The density of the fluid kg/m3

ε——Expansibility coefficient dimensionless

Extended Reading: Differential Pressure (DP) Flow Meters Technology

The Engineers Guide to DP Flow Measurement

What is DP Flow Meter?

The differential pressure flowmeter is an instrument for measuring flow. It uses the principle that there is a certain relationship between the pressure difference and the flow rate generated when the fluid flows through the throttling device. The flow rate is measured by measuring the pressure difference.

The throttling device is a local constriction element installed in the pipeline. The most commonly used are perforated plates, nozzles and venturi tubes.

How is DP flow calculated?

Flow calculation formula 1: The conversion of the relationship between the differential pressure and the flow rate of the differential pressure flowmeter

The differential pressure of a differential pressure flowmeter is proportional to the square of the flow rate. In other words, the flow rate is proportional to the square root of the differential pressure. It is expressed by the following formula:

The scale unit of the flow meter is the flow percentage. The lower limit of the differential pressure is 0 o’clock.

In the above formula:
△P is any differential pressure;
Q is any flow;
△Pmax is the upper limit of differential pressure;
Qmax is the upper limit of the flow rate;
n is any percentage of flow

Flow calculation formula 2: Conversion of volume flow in standard state and working state

The conversion formula of volume flow between standard state and working state is as follows:

In the formula, qv is the volumetric flow rate under working conditions, in m3/h;
qn is the volume flow under standard conditions, in m3/h;
P is the absolute pressure under working conditions, the unit is Pa;
Pn is the absolute pressure in the standard state, in Pa;
T is the thermodynamic temperature under working conditions, in K;
Tn is the thermodynamic temperature in the standard state, in K;
Z is the gas compression coefficient under working conditions;
Zn is the gas compressibility coefficient under standard conditions;

Flow calculation formula 3: Calculation of changing range from standard orifice plate

Sometimes it is encountered in the field that the measured flow exceeds the maximum range of the orifice plate. Or the flow rate is too small and can only be displayed below 30% of the maximum range. The emergency can be met by expanding or reducing the differential pressure range.

The basis for changing the range is the formula. The maximum differential pressure and maximum flow rate of the flowmeter in use are known. With these two parameters combined with the flow calculation formula, the calculation work for changing the range can be carried out.

Tools:

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

Difference between integrated DP flow meter and general DP flowmeter

A general differential pressure flow meter includes two parts: a throttle and a differential pressure transmitter. The installation requires a pressure pipe system to connect the two.

The integrated differential pressure flowmeter directly assembles the throttling piece, the pressure pipe system and the differential pressure transmitter. At the same time, the integrated differential pressure flowmeter depends on the product. It can have both pressure and temperature measurement functions, temperature-pressure compensation functions, etc., all integrated in one device.

DP Flow Meter Straight Run Requirement

The accuracy of flow measurement has a lot to do with whether the installation of the differential pressure flowmeter meets the requirements. The general requirements are as follows:

When installing, it must be ensured that the opening of the throttling piece is concentric with the pipe. The end face of the throttling piece is perpendicular to the axis of the pipe.

There must be a certain length of straight pipe section upstream and downstream of the throttle.

Orifice flowmeter requires 10D front and 5D rear
V-cone flowmeter requires 5D in the front and 1-3D in the back
The elbow flowmeter is installed on the elbow.

What Is Integral Orifice Plate?

The main function of the orifice is to reduce the pressure of the fluid. But it does not mean that it can be mixed, and the orifice plate should be selected according to the specific medium.

The integrated orifice flowmeter is a high turndown differential pressure flow device composed of a standard orifice plate and a 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. It is widely used in process control and measurement in the fields of petroleum, chemical industry, metallurgy, electric power, heating, water supply and so on.

The integrated orifice device is simpler. No pressure tube is required. It can be directly connected to differential pressure transmitter and pressure transmitter.

Extended reading: Vortex Steam Flow Meter

Orifice Plate 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. Read more about: Condensate Flow Meter-Steam Condensate Flow Meter|Types & Selection Guide

Frequently
Asked
Questions

Help Center

The flow rate measured by the differential pressure transmitter is determined based on the maximum differential pressure of the fluid provided by the flow detection orifice or the venturi tube. That is, the maximum range of the differential pressure transmitter.

For example, in the design data provided by a certain orifice or venturi tube. When the maximum fluid flows through, the maximum differential pressure generated is a certain value. This value is the range of the differential pressure transmitter.

Due to the change of fluid volume, the differential pressure does not show a linear relationship. But the differential pressure transmitter does not compensate and calibrate the non-linearity of fluid/differential pressure. This is corrected by the secondary instrument. Or it can be corrected by PLC or DC.

Extended reading: Orifice Meter Vs Venturi Meter

DP Pressure is differential pressure.

Differential pressure refers to the pressure difference between two parts of the process equipment. The pressures of these two points may be gauge pressure or negative pressure. In fact, it is the pressure difference between the gauge pressure or negative pressure of two parts of the process equipment. The negative pressure (vacuum degree) refers to the atmospheric pressure line as a reference, and the pressure below atmospheric pressure is the negative pressure (vacuum degree).

In the production process, the gauge pressure is generally a true reflection of the pressure of a certain part of the process equipment. Allows the operator to monitor and grasp the pressure changes in the production process at all times. In order to save time and deal with emergencies in the production process in a timely manner.

For differential pressure, know the pressure of two parts of the process equipment. Through the pressure difference, you can know the actual flow rate of the fluid or the pressure difference or understand the level of the fluid in the container.

Calculate F low Rate From The Pressure Differentia l.

What are the main categories of orifice flowmeters?

Here is an introduction to its classification:

Eccentric orifice plate. Pressure method: corner connection pressure. Eccentric orifice plate and round orifice plate are only suitable for installation on horizontal or inclined pipes, and cannot be used on vertical pipes.
Built-in orifice plate. This type of orifice plate is made into an integrated orifice plate and measuring tube. It is generally used for small pipe diameters (DN≤50mm). So it is also called small pipe diameter orifice plate.
Standard orifice plate. The standard orifice plate is a standard throttling device with the most specifications, which is widely used in various fluids, especially gas flow measurement. The structure of the orifice plate is different due to the pressure, diameter, and pressure taking method. . The standard orifice plate can be divided into three types: corner connection pressure, flange pressure, and radial distance pressure according to common pressure methods.
Round orifice plate. Pressure method: flange pressure. More flowmeter information is available in the long-term control instrument.

The orifice flowmeter is a liquid and gas flow measurement instrument. The function of the orifice flowmeter is mainly used to measure the flow rate. Like typical steam flow measurement, hot air flow measurement and heat transfer oil flow measurement. These are all It is measured by an orifice flowmeter. Due to the high measurement temperature on site, ordinary measuring instruments cannot be used. Only differential pressure flowmeters can be used for measurement.

Orifice flowmeter is suitable for which fields? This needs to be based on the advantages of orifice flowmeter. Orifice flowmeter is a high temperature and high pressure flow measurement instrument. According to this advantage, it is more suitable for high temperature and high pressure flow. Measurement. Of course, it can solve almost all fluid medium measurement. It is a widely used differential pressure flow meter.

The accuracy of the orifice flowmeter can reach 0.5 level. What is this concept? The error of measuring 1000 tons of flow is 5 tons. The daily production of this precision industry fully meets the use.

More Featured Flow Meters

**A-C Plug-in Ultrasonic Gas Flow Meter on both sides**

**A-J same side plug-in Ultrasonic Gas Flow Meter**

**B-D Pipe Segment Ultrasonic Gas Flow Meter**

Sino-Inst offers Integral DP Flow Meters.

A wide variety of Integral DP Flow Meter options are available to you, such as brass, carbon steel. You can also choose from free samples.

Sino-Inst is Integral DP Flow Meter supplier.Integral DP 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.

KimGuo11

drurylandetheatre.com

Throttling Device

Posted on September 23, 2020 by KimGuo11

A throttling device is also called a throttling flowmeter. A typical differential pressure flow meter. Commonly used to measure the flow of gas, liquid and steam in industrial production.

Throttling device is a flow device in which the fluid filled with the pipe flows through the pipe. The stream will form a local contraction at the throttling. This will increase the flow velocity and reduce the static pressure. So a differential pressure is generated before and after the throttling ( Or called throttling flowmeter).

Get a Quote DP Flowmeters

Features of Throttling Device

The throttling device has the advantages of simple structure, firmness, reliable work, stable performance, high degree, and low price. Therefore, the amount of throttling device has an advantage compared with other flow meters.
Wide range of pipe diameter, φ2～φ3000mm (or larger). The cross-sectional shape, round or rectangular shape is acceptable.
The standard throttling device can determine its measurement degree without real flow calibration.
Applicable to a wide range of tested media. It can be used for almost all gas, steam and liquid flow measurement.
The working pressure can be as high as 32Mpa. Can also be used for negative pressure.
Medium temperature range: -l85～+650℃. Other flowmeters are not yet possible.
The structure of non-standard throttling device is diverse. Almost applicable to various fluid flow measurement.
The flow range can be changed on site by setting the range of the differential pressure transmitter.
It is simple to use, operate, easy to master, and daily maintenance is small.

Extended reading: V-Cone Flow Meter Working Principle

Throttling Device type and composition

The throttling device consists of throttling parts (such as orifice plate, nozzle, etc.). Pressure Sensors, fastening devices (flanges, bolts, nuts, gaskets, etc.), and other accessories (pressure guiding tubes, stop Valve, etc.). It can also be equipped with front and rear measuring tubes and flanges at both ends of the straight pipe section.

Throttle Parts

Code	Name	Code	Name	Code	Name
A	Restrictor orifice	K	Wide Edge Orifice	T	Machined Venturi
B	Standard orifice or eight-slot orifice	L	Venturi nozzle	U	Wedge flowmeter
C	Long diameter nozzle	M	Small nozzle	V	V cone flowmeter
D	End orifice plate	N	Orifice plate	W	Rough welded iron plate venturi
E	1/4 arc orifice (nozzle)	O	Eccentric orifice	X	Rough cast venturi
F	Low pressure loss flowmeter	P	ISA1932 nozzle or eight-slot nozzle	Y	Double orifice plate
G	High pressure lens aperture plate	Q	Round hole plate	Z	Averaging tube flowmeter
H	Annular orifice	R	Conical inlet orifice
J	Wing type wind measuring device	S	Double venturi

Extended Reading: Differential Pressure (DP) Flow Meters Technology

Pressure method

Code	Name	Code	Name
H	Corner connection pressure (ring chamber)	J	Diameter pressure
Z	Corner connection pressure (drilling)	T	Special pressure
F	Flange pressure

Note: The current limiting orifice has no such representation method

Diameter

Code	2	3	4	5	6	8	10	12	15	17	20	22	25
Diameter (mm)	25	32	40	50	65	80	100	125	150	175	200	225	250

Code	27	30	32	35	37	40	45	50	60	70	80	90	99
Diameter (mm)	275	300	325	350	375	400	450	500	600	700	800	900	1000

Pipe diameter greater than 1000 is expressed as 1/10 of the actual pipe diameter

Nominal pressure

Code	0	1	2	3	4	6	10	16	20	25	32	40
Nominal pressure(Mpa)	0.6	1	1.6	2.5	4	6.4	10	16	20	25	32	42

The special nominal pressure is filled in according to the actual design pressure value

Supply method

Code	Supply content
A	Complete device with front 10D and rear 5D measuring tubes (including connecting flange and process flange)
A1	Complete device with front 10D and rear 5D measuring tube (including connecting flange)
A2	Complete device with front 10D and rear 5D measuring tube (pipe end inverted bevel)
B	A complete set of equipment with upstream and downstream measuring tubes (including process flanges) according to petrochemical standards (HGJ516-87)
B1	According to the petrochemical standard (HGJ516-87), a complete set of equipment with upstream and downstream measuring pipes (pipe end inverted bevel)
B2	According to the petrochemical standard (HGJ516-87), a complete set of equipment without upstream and downstream measuring tubes
C	According to the standard of the Ministry of Electric Power (GD87-1101) a complete set of equipment with upstream and downstream measuring tubes
D	Flanges, ring chambers or pressure-taking flanges, throttles, pressure pipes, fasteners and other complete sets of devices without measuring tubes
E	Single throttle

Extended reading: [Working principle&Price]SI3051ANB Annubar Flow Meter

The principle of Throttling Device flow measurement

The throttling device artificially causes throttling in the pipeline through which the medium circulates (as shown in the figure). When the measured medium flows through the throttling device, it causes a local contraction. The stream is concentrated, the flow velocity increases, and the static pressure decreases.

Therefore, differential pressure is generated between the upstream and downstream sides of the throttle. There is a certain functional relationship between this differential pressure and the flow rate. The greater the flow, the greater the differential pressure generated. Therefore, the flow can be measured by measuring the differential pressure.

Throttling Device Types

As the most important branch of the flow meter, the throttling device is divided into two categories: standard throttling devices and non-standard throttling devices.

Standard throttling devices include: standard orifice plate, ISA standard nozzle, long neck nozzle, classic venturi tube and venturi nozzle;

Non-standard throttling devices include: annular orifice plate. Quarter circle nozzle. Quarter circle orifice plate. Conical inlet orifice plate. Round missing orifice plate. Eccentric orifice plate. Double orifice plate. Low pressure loss flow tube. Rectangular venturi tube, V-cone flowmeter, wedge flowmeter, built-in orifice, restrictive orifice, etc.

Extended reading: What is a flow nozzle?

Orifice Throttle Flow Meter

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

You may like:

**A-D pipe segment Ultrasonic Gas Flow Meter**

**A-S single rod plug-in Ultrasonic Gas Flow Meter**

Read more about: 5 Factors Affecting Pressure Drop

Sino-Inst offers Throttling Devices. A wide variety of Throttling Device options are available to you, such as brass, carbon steel. You can also choose from free samples.

Sino-Inst is an Throttling Device 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.

KimGuo11

drurylandetheatre.com

Sheath Thermocouple

Assembled Sheathed Thermocouple

Explosion-proof Thermocouple

Platinum Rhodium Thermocouple

K-type Thermocouple

Thermocouple Types

Features of V-series Curved Digital Mass Flow Meter

Specifications of V-series Curved Digital Mass Flow Meter

Pros and cons of Coriolis Digital Mass Flow Meter

Thermal mass flow meter

Features of T-series Triangle Coriolis Mass Flowmeter

Specifications of T-series Coriolis Mass Flowmeter

Coriolis Mass Flowmeter Working Principle

High Viscosity Flow Measurement

Oval Gear Meter VS. Coriolis Meter For High Viscosity Fluids Measurement

Ultrasonic flow meter for High Viscosity Flow Measurement

Coriolis meter for High viscosity liquid

Oval Gear Meter For High Visocisty Liquid

Flowmeters for Viscous Liquids

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Featured Mass Flow Meters

Featured Mass Flow Controllers

Mass Flow Meter Types

Mass Flow Meter Price

Features of V-Cone Flow Meter

V-Cone Flow Meter Specification

V-Cone Flow Meter Applications

veris flow measurement group

rotameter

V-Cone Flow Meter Working Principle

V-cone flow meter disadvantages

V-Cone Flow Meter Installation

v cone flow meter straight length

Frequently Asked Questions

What is V Cone flowmeter?

What are the three types of flow meters?

Which flow meter gives highest accuracy?

Related DP Flow Meters

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Features of Wedge Flow Meter

Specification of Wedge Flow Meter

Wedge Flow Meter Applications

Wedge Flow Meter Working Principle

Wedge Flow Meter Calculation

Wedge flowmeter Vs V-cone flowmeter

Features of High pressure and High temperature flow meter

Welding Orifice Plate|High pressure and High temperature flow meter Specification

More Featured High Temperature Flow Meters

Vortex Split High Temperature Flow Meter

High temperature mass flow meter

High temperature ultrasonic flow meter

High temperature water flow meter

High temperature turbine flow meter

High temperature air flow meter

Features of Integral DP Flow Meter

Integral DP Flow Meter Specification

DP Flow Meter Working Principle

The Engineers Guide to DP Flow Measurement

What is DP Flow Meter?

How is DP flow calculated?

Difference between integrated DP flow meter and general DP flowmeter

DP Flow Meter Straight Run Requirement

What Is Integral Orifice Plate?

Orifice Plate Flow Meter

Frequently Asked Questions

How do you measure flow rate with a DP transmitter?

What is DP pressure?

What are the different types of orifice meter?

What does an orifice meter do?

What is the accuracy of an orifice plate flow meter?

More Featured Flow Meters

Features of Throttling Device

Throttling Device type and composition

The principle of Throttling Device flow measurement

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