Liquid mass flow controller can quickly and accurately measure the volume flow/mass flow of the process liquid quickly and accurately.
The liquid quality controller/flow meter is specifically designed for the measurement and control of small flow liquids. It is mainly used for low-viscosity, non-corrosive 304 materials. The internal PID closed-loop system is set to realize automatic flow adjustment.
It can quickly and accurately measure the volume flow/mass flow of the process liquid;
Use a customized high-speed proportional control valve to accurately control the liquid volume flow/mass flow;
With a unique vent hole can easily exhaust air;
There are no movable components and thermal components inside. Passed anti-vibration test. Insensitive to installation direction;
Using patented internal compensation laminar flow pressure difference technology, the fluid still maintains laminar motion under a large flow range;
Integrated multi-function digital display. Allows users to control the set value and PID valve adjustment only through the operation of the screen buttons. Simultaneously open analog input and output and RS-485 digital communication;
Multi-variable measurement and 50:1 range adjustable ratio. So that only one liquid flow meter & controller can replace the effect of multiple devices.
The accuracy of 1%, repeatability of 1%, and control response time of fewer than 200 milliseconds ensure the normal operation of the process gas.
Gas mass flow controller for micro gas flow measure &control
The gas mass flow controller is based on the principle of thermal mass flow measurement. With control valve. The Micro Gas Flow Controller (MFC) is used to precisely measure and control the mass flow of gas.
Mass flow controller, namely Mass Flow Controller (abbreviated as MFC). Not only has the function of a mass flow meter. More importantly, it can automatically control the gas flow. That is, users can set the flow rate according to their needs. MFC automatically keeps the flow constant at the set value. Even if the system pressure fluctuates or the ambient temperature changes, it will not deviate from the set value.
Simply put, the mass flow controller is a steady flow device. It is a gas steady flow device that can be set manually or automatically controlled by connecting with a computer.
Mass flow meter, namely Mass Flow Meter (abbreviated as MFM). It is an instrument for accurately measuring gas flow. The measured value is not inaccurate due to temperature or pressure fluctuations, and does not require temperature and pressure compensation.
The mass flow controller is composed of a flow sensor, a diverter channel, a flow regulating valve and an amplifying controller.
The flow sensor uses the principle of capillary heat transfer thermometry to measure the mass flow of gas (without temperature and pressure compensation). The flow signal measured by the sensor heating bridge is sent to the amplifier to be amplified. The amplified flow detection voltage is compared with the set voltage. Then the difference signal is amplified to control the regulating valve. Closed loop control of the flow through the channel to make it equal The set flow is equal.
The flow divider determines the flow of the main channel. The flow indicator matched with the mass flow controller is equipped with a regulated power supply, a digital voltmeter, setting potentiometer, peripherals, internal conversion and three-position valve control switch, etc.
Liquid Turbine Flow Meter is one of the most ideal flow meters for measuring liquids. Liquid…
Sino-Inst offer over 5 liqiud Mass Flow controller with Best Price.
A wide variety of liquid Mass Flow controller options are available to you, such as free samples, paid samples.
Sino-Inst is liquid Mass Flow Meters and controller suppliers, located in China. Mass Flow Meters products are most popular in North America, Mid East, and Eastern Europe.
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.
The gas mass flow controller is based on the principle of thermal mass flow measurement. With control valve. The Micro Gas Flow Controller (MFC) is used to precisely measure and control the mass flow of gas.
The standard minimum flow rate of the micro gas mass flowmeter is 2ml/min. Chlorine, air, and compressed air can reach it. Some gases with a low C.F coefficient can be measured even lower
The standard accuracy of the gas mass flowmeter is 0.5%. 1.0% reading, 0.5% full scale accuracy, repeatability 0.2%. The accuracy of the controller is 1.0% (full scale)
The flowmeter’s turndown ratio is 1:100
The valve control range of the controller is 1:50
The minimum can measure 2sccm, the maximum can reach 3000slm
The base material of the flowmeter and controller is SS316L. The material in contact with the gas is also SS316L. It can measure some weakly corrosive gases.
The leak rate of the flow meter and controller is 1×10-SCCSHe.
Sealing material is chloro rubber, oxyprene butadiene rubber
Specifications of Gas mass flow controller
Medium
Suitable for gas, weakly corrosive gas. For example: nitrogen, air, not suitable for ammonia
The mass flow meter uses the principle of capillary heat transfer thermometry to measure the mass flow of gas (without temperature and pressure compensation).
The flow signal measured by the sensor heating bridge is sent to the amplifier for amplification. The amplified flow measurement voltage is compared with the set voltage.
Then amplify the difference signal to control the regulating valve. Through closed-loop control to control the flow-through, and make it equal to the set flow. The flow divider determines the flow of the main channel.
The picture shows the working principle diagram of the MFC and the flow indicator connected:
The detected voltage of the flow rate output by the controller is directly proportional to the quality of the gas flowing through the channel. The full-scale detection output voltage is 5VDC. The detection range of the gas mass flow controller is 2~100% full scale (the turndown ratio is 50:1) The flow resolution is 0.1% of full scale.
Note: When the “valve control” line of the gas mass flow controller is set to the “cleaning” position, it can also be used as a gas mass flow meter. At this time, the output value of the flow detection output voltage may reach more than 10VDC.
It should be noted that once the output voltage exceeds 5VDC, the flow detection voltage and the actual flow rate are not linearly corresponding.
When cleaning, the flow rate display is inaccurate. Moreover, the flow rate may increase and the display decrease. But these will not damage the mass flow controller.
Positive displacement flow meter, also known as fixed displacement flow meter.
It uses mechanical measuring elements to continuously divide the fluid into a single known volume part. The fluid volume flow rate is measured according to the number of times that the measuring chamber is filled and discharged with the volume part of fluid successively.
Float type flowmeter, also known as rotameter.
It is a kind of variable area flowmeter. In a vertical tapered tube that expands from bottom to top. The gravity of a float with a circular cross-section is borne by the hydrodynamic force. So that the float can rise and fall freely in the cone tube.
It is based on the differential pressure generated by the flow detector installed in the pipeline. Known fluid conditions and the size of the test room and pipeline to calculate the flow of the meter.
A non-streamline vortex generator is placed in the fluid. The fluid is alternately separated on both sides of the generator to release two series of regularly staggered vortex meters.
It is the main type of velocity flow meters. It uses a multi-blade rotor (turbine) to sense the average flow velocity of the fluid. In order to derive the flow or total meter.
A meter that measures the flow rate by detecting the effect of fluid flow on the ultrasonic beam (or ultrasonic pulse).
Electromagnetic flowmeter.
Electromagnetic flowmeter is an instrument for measuring conductive liquid made according to Faraday’s law of electromagnetic induction. Electromagnetic flowmeter has a series of excellent characteristics. It can solve the problems that other flowmeters are not easy to apply, such as the measurement of dirty flow and corrosive flow.
Thermal flow meter.
The thermal flow meter sensor contains two sensing elements. A speed sensor and a temperature sensor.
They automatically compensate and correct for gas temperature changes.
The electric heating part of the instrument heats the speed sensor to a certain fixed value higher than the temperature of the working condition. A constant temperature difference is formed between the speed sensor and the sensor that measures the temperature of the working condition.
When the temperature difference is kept constant, the energy consumed by electric heating can also be said to be the heat dissipation value. It is proportional to the mass flow rate of the gas flowing through it. It is suitable for the measurement of single gas and fixed ratio multi-component gas.
Coriolis flowmeter.
The principle is to use the Coriolis force generated when the fluid flows in the vibrating tube. The force is measured directly or indirectly to obtain the fluid mass flow rate.
What we usually call a mass flow controller, its full name is a thermal gas mass flow controller, or MFC for short.
The full name of mass flow meter is thermal gas mass flow meter, referred to as MFM.
They are an instrument that precisely measures gas flow. Its measured value will not be inaccurate due to changes in temperature or pressure.
A mass flow meter is a meter for measurement and monitoring. The mass flow controller not only has the function of mass flow meter. More importantly: it can automatically control the flow of gas. That is to say, the user can set the flow rate according to the needs of the situation. The flow controller automatically keeps the flow constant at the set value. Even if the system pressure fluctuates or the ambient temperature changes, it will not deviate from the original set value.
Simply put, a mass flow controller is a steady flow device. It is an automatic control gas flow stabilization device that can be manually set or connected with a calculator.
In general, if only the gas flow is measured or monitored, a mass flow meter can meet the requirements.
And if it is necessary to control the gas flow, a mass flow controller is required.
In some measurement occasions, both can be used. Such as the measurement of capillary flow capacity, when measuring flow at constant pressure, use a mass flow meter. When measuring constant flow and pressure, a mass flow controller is required.
Note that when the mass flow controller is in the cleaning state, it can also be used as a mass flow meter. It’s just that the pressure drop is larger than that of ordinary mass flow meters.
The volume flowmeter can only measure the volume flow directly, if you want to measure the mass flow, if you give a fixed density value during configuration. This makes it impossible to detect density dynamically. Less accurate.
Mass flow controllers/flowmeters measure gases that are not affected by temperature and pressure.
Mass flow controller MFC not only has the function of mass flow meter. What’s more, it can automatically control the gas flow. The flow rate can be set according to actual needs.
The MFC automatically keeps the flow constant at the set value. Even if the system pressure fluctuates or the ambient temperature changes. It will not deviate from the error range of the set value.
Mass flow controllers can be used to control all kinds of gases. Including corrosive gases and special gases.
But pay attention to the use of corrosive gases and special gases. Proper selection of model and seal material is required.
When ordering, the user needs to declare the gas to be used. In order to avoid serious losses due to wrong selection or selection of sealing materials.
Usually, the wet material of the mass flow controller contacting the working gas is 316L stainless steel, polytetrafluoroethylene and sealing materials. Sealing materials are divided into two categories: metal seals and rubber seals. Metal seal materials are generally corrosion-resistant materials such as stainless steel, gold or nickel.
The MFC with metal seal can be used for any gas in principle, including various corrosive gases and special gases.
For strong corrosive gases such as boron tribromide, boron trichloride, and hydrogen fluoride, and metal oxide gases used in MOCVD, it is recommended to use a metal-sealed MFC.
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Sino-Inst is a manufacturer of Gas Mass Flow Controllers for Measurement of Gas. It has an accumulation function, and can operate in timing accumulation or quantitative accumulation mode respectively. After the accumulation amount is reached, the flow controller will stop automatically, which is convenient for various experimental research occasions application.
Sino-Inst Gas Mass Flow Controllers not only have the function of a mass flow meter. More importantly, it can automatically control the gas flow. That is, the user can set the flow according to the needs, and the MFC will automatically keep the flow constant at the set value. Even If the system pressure fluctuates or the ambient temperature changes, it will not deviate from the set value.
The mass flow controller is a steady flow device, which is a gas steady flow device that can be manually set or automatically controlled by connecting with a computer.
The measurement range of Sino-Inst Gas Mass Flow Controllers is wide, from full scale 5ml/min to 1500 liters/min. There are also many gas media that can be measured, suitable for general nitrogen, air, carbon dioxide, hydrogen and other gases. According to the communication method It is different, divided into 0-5V or 4-20mA analog type and RS485modbus digital type. The withstand voltage of the product is divided into 10Mpa, 5Mpa and 3Mpa according to the flow rate.
Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is a Gas Mass Flow Controller, level sensors, or other equipment, please give us a call.
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.
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.
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.
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.
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.
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.
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.
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.
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
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.
(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.
(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)
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.
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.
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.
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 .
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Sino-Inst, Manufacuturer for Coriolis Mass Flowmeters.
T-series Triangle Coriolis Mass Flowmeter simultaneously measures mass flow, density, temperature and viscosity.
Sino-Inst’s T-series Triangle Coriolis Mass Flowmeters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.
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.
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
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.
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.
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.
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.
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.
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.
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.
Sino-Inst offer over 50Mass 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.
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.
Liquid Mass Flow Meter can perform accurate mass measurements for liquids or slurries. Used for volumetric flow metering of liquids in pipelines. Such as diesel fuel, fuel oil flow measurement.
Liquid mass flow meter, we mean the mass flow meter can measure the flow rate of liquid, like the: diesel fuel, fuel oil, water, caustic, and gases/vapors. And we can use the thermal mass flow meter for the gas flow rates measurement. Coriolis mass flow meter is well known to everyone. Sino-Inst offers liquid mass flow meters based on the Coriolis mass theory.
Sino-Inst offers a variety of mass flow meters for flow measurement. If you have any questions, please contact our sales engineers.
The gas flow measurement does not require temperature and pressure compensation, and the measurement is convenient and accurate.
Multivariable flow: Provide accurate measurement for a series of variables. Including mass flow, volume flow, total flow, density and temperature.
Using MVD multivariable digital technology converter: from analog signal processing to digital signal processing. A stable signal can be generated, thereby improving response speed and measurement accuracy.
Easy to use: LCD display. Users can directly and conveniently perform configuration operations through touch buttons in English.
The CMF mass flowmeter can be monitored in the following areas to meet the needs of its ingredients, mixing processing and commercial measurement:
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. For example, the metering of pipeline transportation liquid
Liquid Mass Flow Meter working principle
Coriolis mass flowmeters measure the force resulting from the acceleration, caused by mass moving toward (or away from) a center of rotation.
This effect can be experienced, when riding a merry-go-round, where moving toward the center will cause a person to have to “lean into” the rotation so as to maintain balance.
As related to flowmeters, the effect can be demonstrated by flowing water in a loop of flexible hose, that is “swung” back and forth in front of the body with both hands. Because the water is flowing toward and away from the hands, opposite forces are generated and cause the hose to twist.
They represent about 21% of all flowmeters sold.
In a Coriolis mass flowmeter, the “swinging” is generated by vibrating the tube(s) in which the fluid flows.
The amount of twist is proportional to the mass flow rate of fluid passing through the tube(s).
Sensors and a Coriolis mass flowmeter transmitter are used to measure the twist and generate a linear flow signal.
How do you calculate mass flow rate?
As shown, when a mass point of mass m moves at a velocity υ in a pipe that rotates at an angular velocity ω for the p-axis, the particle is subjected to acceleration of two components and its force.
a. The normal acceleration is the centripetal force acceleration αr, the magnitude of which is equal to ω2r, the direction is toward the P axis;
b. Tangential acceleration αt is the Coriolis acceleration, the magnitude of which is equal to 2ωυ, and the direction is perpendicular to αr.
Due to the compound motion,
Coriolis Fc=2ωυm acts on the αt direction of the particle, and the pipe acts on the particle with a reverse force of -Fc= -2ωυm.
When a fluid of density ρ flows at a constant velocity in a rotating pipe, any pipe of length Δx will be subjected to a tangential Coriolis force of ΔFc.
Where A is the cross-sectional area of the pipeline. Since the flow rate of the mass flow meter is δm, δm=ρυA.
Therefore, directly or indirectly measuring the Coriolis force generated by the flowing fluid in the rotating pipe can measure the mass flow, which is the basic principle of the Coriolis mass flowmeter.
However, it is difficult to generate Coriolis force by the rotary motion.
At present, the product is replaced by a pipe vibration, that is, a thin-walled measuring tube fixed by two broken ends,at the midpoint of the measuring tube resonance or near resonance frequency.
Excitation, the fluid flowing in the tube generates Coriolis force, causing the opposite direction of deflection in the front and rear half points of the measuring tube. And electromagnetically detecting the amount of deflection to obtain mass flow.
Since the density of the fluid affects the vibration frequency of the measuring tube, and the density has a fixed relationship with the frequency, the mass flow meter can also measure the fluid density.
Liquid carbon dioxide refers to the liquefaction of carbon dioxide gas into liquid form under high pressure and low temperature. Liquid carbon dioxide is a refrigerant that can be used to preserve food and can also be used for artificial rainfall. It is also an industrial raw material that can be used to make soda ash, urea and soda.
Generally, a mass flow meter can be used to measure the mass flow of liquid carbon dioxide. Or, you can also use our spur gear flow transmitter to measure.
Liquid Nitrogen Mass Flow Meter
Coriolis mass flow meters can also measure the mass flow of liquid nitrogen. The measurement effect is also very good. However, the cost of Coriolis mass flow meters is relatively high.
Therefore, sometimes, we can also use a flow meter for him to measure the flow of liquid nitrogen.
A liquid nitrogen flow meter is a commonly used cryogenic flow meter. The low-temperature turbine flowmeter is a dedicated liquid nitrogen flowmeter. It can also be used to measure cryogenic liquids such as liquid oxygen.
Liquid nitrogen refers to Liquid with extremely low temperatures. In industrial production, liquid nitrogen can be used as a deep refrigerant. The low-temperature turbine flowmeter is used as a liquid nitrogen flowmeter, which can work at a low temperature of -196°C (-320.8 °F). Liquid Nitrogen Flow Meter’s Turbine sensor structure at ultra-low temperature (-196℃) is made of special customized material. Realize the instantaneous and cumulative flow monitoring of liquid nitrogen.
FAQ
The mass flow meter directly measures the mass flow of the medium passing through the flow meter, and can also measure the density of the medium and indirectly measure the temperature of the medium. Since the transmitter is an intelligent instrument with a single-chip microcomputer as the core, more than a dozen parameters can be derived for users to use based on the three basic quantities mentioned above. The mass flow meter has a flexible configuration, powerful functions, and a high performance-price ratio. It is a new generation flow meter.
②Deduced mass flow meter That is, a combination of the volumetric flowmeter and density meter is used to measure mass flow. At the same time, the volume flow rate and fluid density are detected. The output signal related to the mass flow rate is obtained through calculation.
③Compensating mass flowmeter At the same time, the volume flow rate of the fluid and the temperature and pressure of the fluid are detected, and then according to the relationship between the density of the fluid and the temperature and pressure. The density value of the fluid in this state is calculated by the calculation unit. Then calculate the mass flow value of the fluid.
The mass flow meter is a function of fluid volume and fluid temperature and pressure. Is a dependent variable. The quality of a fluid is a quantity that does not change with time, space temperature, and pressure.
The electromagnetic flowmeter is a pure liquid volume measurement instrument.
Flowmeter is one of the important measuring instruments in process automation instruments and devices.
According to the physical properties of the measured medium, it can be divided into liquid flow meters and gas flow meters.
Among them, there are many types of liquid flow meters.
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.
Coriolis flow meter is also called Coriolis mass flow meter. Based on the principles of Micro motion mechanics. Coriolis meters provide extremely accurate mass or volume flow, density and temperature measurement.
A Coriolis flow meter is a type of mass flow meter. It is designed differently and works differently than thermal or differential mass flow meters. Coriolis meters provide extremely accurate mass or volume flow, density and temperature measurement with few moving parts and no straight pipe requirements.
Sino-Inst offers a variety of Mass Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
Directly measure the mass flow of fluid in the pipeline
The measurement accuracy is high and the repeatability is good. It can directly measure the fluid mass flow in a large range
High measurement accuracy
The mass flow measurement accuracy of this flowmeter is 0.2 level
Stable and reliable work
There are no obstacles and moving parts in the fluid measuring tube, so it has high reliability and long life.
Adapted fluid medium surface width
In addition to uniform fluids with general viscosity, it can also measure high-viscosity fluids (honey, oil slurry, etc.).
It can measure not only the fluid parameters of a single solution, but also multiphase flow.
Whether the medium is laminar or turbulent, it does not affect its measurement accuracy.
Wide application environment
It is suitable for petrochemical, chemical, metallurgical, pharmaceutical, paper, food, energy and environmental protection industries.
In the process of inspection and control and custody transfer measurement and other occasions.
Has been widely used,
Multiple real-time online measurement and control functions
In addition to mass flow, the density and temperature of the fluid can also be directly measured.
The intelligent flow transmitter can provide a variety of parameter display and control functions. It is a multi-function flow measurement and control instrument.
Good scalability
The company can design and manufacture mass flow meters with special specifications and special functions according to user needs.
It can also perform remote monitoring operations.
Specifications of Coriolis Flow Meter
Measured medium
Liquid, gas
Measuring diameter
1mm~300mm
Measurement items
Mass flow, density, temperature, volume flow, concentration
Density measurement range
0.2g/cm3~2.5g/cm3
Medium temperature
-200℃～+300℃
Flow measurement error
Liquid 0.2%R+Cz, 0.15%R+Cz, gas 0.5%R+Cz, 1.0%R+Cz,
Density measurement error
0.002g/cm3
Temperature measurement error
≤1℃
Signal form
4～20mA, O~2kHZ, RS485, Hart
Power supply
24VDC
Measuring tube material
304, 316, can also be negotiated and provided according to user requirements
Explosion-proof grade
Exd(ib)IICT2~T5, ExdIICT4
Enclosure rating
IP67
Flange standard
National standard GB/T series standards can also be processed according to user requirements.
Instrument output form
a. Current output: 4-20mA; power supply: 13-28VDC, three-wire system; b. Pulse output: 0～2KHZ; power supply: 13-28VDC; optocoupler output>3mA; c, RS485 interface d, HART communication;
Instrument wiring
a. The electrical connection port specification of the flowmeter signal output line is: M20 × 1.5; it can also be customized according to user requirements. b. The 4-20mA current output is a three-wire system; c. The pulse output is a three-wire system.
Coriolis mass flowmeter consists of two parts: flow sensor and converter (or flow computer).
The following figure shows an example of a flow sensor, which mainly consists of a measuring tube 2 and its supporting tube 1, a driving coil 4 in the measuring tube vibration excitation system, an electromagnetic detection probe 3 and 6 for detecting the deflection of the measuring tube, and a correction measuring tube material Yang Yang The temperature measurement components and other components affected by the modulus temperature.
U-tube sensor structure diagram 1 Support tube 2 Measuring tube 3 and 6 Magnetic detection probe 4 Drive coil 5 shell
The converter is mainly composed of the vibration signal generation unit, signal detection and signal processing unit of the vibration excitation system; the flow computer also has the functions of configuration setting, engineering unit conversion, signal display and communication with the host computer.
As shown in the figure, when a mass point with a mass of m moves at a speed υ in a pipe rotating at an angular velocity ω on the p axis, the mass point is subjected to the acceleration and force of two components.
a. Normal acceleration is the centripetal force acceleration αr, its magnitude is equal to ω2r, and the direction is toward the P axis; b. Tangential acceleration αt is Coriolis acceleration, its magnitude is equal to 2ωυ, and the direction is perpendicular to αr. Due to the compound motion, Coriolis Fc=2ωυm acts in the αt direction of the particle, and the pipe acts on the particle with a reverse force -Fc= -2ωυm.
When a fluid with a density of ρ flows at a constant speed υ in a rotating pipe, any pipe with a length of Δx will experience a tangential Coriolis force of ΔFc.
(1)
In the formula, A-the internal cross-sectional area of the pipeline. Since the mass flow rate is δm, δm=ρυA. And so
(2)
Therefore, the mass flow can be measured by directly or indirectly measuring the Coriolis force generated by the fluid flowing in the rotating pipe. This is the basic principle of the Coriolis mass flowmeter.
However, it is difficult to generate Coriolis force by rotating motion. The current products are all replaced by pipe vibration, which is a thin-walled measuring tube fixed by two broken ends. At the midpoint, it is excited at or near the resonance of the measuring tube. The fluid flowing in the tube generates Coriolis force, which causes the two halves of the measuring tube to be deflected in opposite directions. Electromagnetic method is used to detect the amount of deflection to obtain the mass flow rate.
The fluid density will affect the vibration frequency of the measuring tube. The density has a fixed relationship with frequency. Therefore, mass flow meters can also measure fluid density.
OMEGA Engineering has a great explanation video about Coriolis Flow Measuring Principle. Let’s take a look together.
Coriolis Flow Meter can play a very effective role in the batching and batch measurement of various feeds in the following fields. The measurement and control of material flow in the process. The rapid and changeable density measurement. As well as product quality monitoring and other aspects.
Coriolis Flow Meter is mainly used to measure the mass flow and total volume and density of the medium. At the same time, it can also measure the volume flow and total volume, the temperature of the medium, the water content, the alcohol content of alcohol, and the concentration of two liquids that are more uniformly mixed. , The ratio of raw materials in the process flow, etc.
Applications of Coriolis mass flow meter
It is mainly applicable to the following industries: (1) Petroleum industry, such as crude oil production measurement, water cut, single well production measurement, crude oil transportation measurement (2) Chemical industry (3) Food industry (4) Pharmaceutical manufacturing industry, such as liquid medicine production and measurement (5) Papermaking industry, such as pulp metering (6) Textile printing and dyeing industry (7) Energy transmission measurement, such as liquefied gas measurement (8) Environmental protection industry, such as sewage treatment; measuring slurry density during desulfurization
Advantages and Disadvantages of coriolis flow meter
Advantage
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
The instability of the zero point of the Coriolis mass flowmeter results in zero drift, which affects the further improvement of its accuracy. Many types of meters have to divide the total error into two parts, the basic error and the zero point instability measurement.
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), which 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 relatively high installation and fixation of flow sensors.
It cannot be used for larger pipe diameters, and is currently limited to 150 (200) mm or less.
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 flow meters are even 100% larger than volumetric meters.
Most models of Coriolis mass flow meters are larger in weight and volume.
Expensive. The overseas 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 Chinese price is about 2 to 8 times that of the electromagnetic flowmeter.
Coriolis flow meter installation
Installation Requirements for Coriolis Mass Flowmeters
When choose Flowmeter, many enterprises will choose Coriolis mass Flowmeter under reasonable cost. Under the correct installation, Coriolis mass Flowmeter can directy measure the mass and density of fluid. Only reasonable installation can ensure the accuracy and stability of mass Flowmeter.
1. Conventional of Coriolis Mass Flowmeter Installation
At least 0.6 m distance between the sensor and a large transmitter or motor. Since the sensor depends on the electromagnetic field. It is necessary to avoid installing the sensor near the large interference electromagnetic field. In addition, the installation position should be carefully selected to avoid vibration as far as possible.
2. Installation Direction
The requirements of the process and the location of the process pipeline have determined the installation direction of most sensors.While the sensor installation angle does not affect the flowmeter operation, the following recommendations should be considered to the extent possible:
(1) When measuring the liquid. The sensor housing shall be mounted downward to avoid air gathering in the flow tube;
(2) When measuring the gas. The sensor housing shall be mounted upward to avoid condensation water gathering in the flow tube;
(3) When measuring liquid slurry. The sensor shall be mounted vertically, like a flag, to avoid the accumulation of particles in the flow tube. The process medium should flow from the bottom up to avoid the jet tube.
3. Valves
In order to facilitate Flowmeter zero adjustment, the downstream sensor should be installed globe valve. To facilitate batch operation, sensors and globe valves should be as close as possible to the receiving container.
Hose should not be installed between sensor and globe valve to avoid batch error caused by expansion or compression. Also, control valves can be installed downstream to prevent vaporization or emptying of the medium.
4. Flow direction of mass flow meter installation
No matter what flow direction, the flow sensor can accurately measure the flow rate. The normal flow direction of the fluid is indicated by arrows on the general sensor.
5. Gas&liquid two-phase flow
If the process medium produces a gas-liquid two-phase flow, the sensor housing should be installed down or on a vertical pipe. This installation can effectively avoid the accumulation of gas in the medium in the flow tube.
In loading and unloading metering applications, the sensor housing should be mounted upwards or vertically. One-way valves should be installed downstream of the sensor to prevent medium reflux. One-way valves should be installed as close as possible to the sensor.
In some cases, the process medium can not be completely excluded from the pipeline. And flag installation is generally recommended.
When Coriolis mass Flowmeter is installed, the direction of installation is very important. The direction of installation is determined according to the position of the process pipeline arranged on the spot.
Reasonable installation can ensure the long-term stable work of Coriolis mass Flowmeter. Installation Requirements for Coriolis Mass Flowmeters.
Four Installation Methods of Coriolis Mass Flowmeters
I. Normal installation, medium/large Coriolis mass flowmeter
It is recommended to release and empty the gas that may be stored in the Coriolis mass Flowmeter pipeline of Shanghai Automation instrument Co., Ltd before installation.
II. Inverted installation, medium/large Coriolis mass flowmeter
It is recommended to use an inverted installation to measure gas (e.g. steam). Because only in this way, the liquid that may be stored in the Coriolis mass Flowmeter can be released and emptied.
III. Flag type installation, medium/large Coriolis mass flowmeter
Flag installation is the installation of Coriolis mass Flowmeter perpendicular to horizontal line.
Flag type mounting is recommended to measure the suspension and liquid and solid biphasic liquids.
For example, for liquids that are easy to solidify under temperature change, for liquids with high viscosity, it is necessary to empty the liquid left in the measuring pipe after measurement.
Flag mounting will not affect the measurement accuracy of any type of liquid measured. but the direction of the measurement flow must be bottom-up.
IV. Miniature Pipe Size Coriolis Instrument Installation
Sino-Inst small size Coriolis mass Flowmeter has a very small flow range and high accuracy requirements. In this way, stable mounting plates and supports are necessary. The mounting plate and Coriolis mass Flowmeter must be completely flat without any space.
If not, use horizontal bolts to adjust the balance. The small size Coriolis mass flowmeter is installed as follows:
Types of mass flow-meters
Sino-Inst offer different types of mass flow meter, like:
A wide variety of Coriolis mass flow meter options are available to you, such as free samples, paid samples. Sino-Instr is Coriolis mass flow meter suppliers, located in China.
Coriolis mass flow meter products are most popular in North America, Mid East, and Eastern Europe.
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.
Thermal Mass Flow Meter, also called calorimetric flow meter, is an instrument that measures gas flow based on the principle of thermal diffusion. When the fluid passes through a pipe heated by a heat source, the temperature field will change. The thermal mass flow meter uses this The fluid flow rate is measured based on the change or the relationship between the energy required to increase the fluid temperature and the fluid mass. Generally used to measure the mass flow of gas. It is widely used in many industrial fields.
4 lines LCD Mass flow, Volume flow in standard condition, Flow totalizer, Date and Time, Working time, and Velocity, etc.
Protection Class
IP65
Sensor Housing Material
Stainless steel (316)
Thermal mass flow meter advantages and disadvantages
Pros
No need for temperature and pressure compensation for gas flow measurement. Convenient and accurate measurement;
Wide range ratio, can be used for gas leak detection;
Measuring flow rate range: 0.1Nm/s～100Nm/s.
Good seismic performance and long service life, free from the influence of vibration on measurement accuracy;
Overall digital circuit measurement, accurate measurement and convenient maintenance;
Using RS-485 communication, factory automation and integration can be realized. click for inqueries
No pressure loss, suitable for pipes of any shape with known cross-sectional area.
Corrosion-resistant sensor, suitable for measuring corrosive gas.
It is especially suitable for large-caliber measurement to ensure the accuracy of measurement and is suitable for trade settlement.
The amount of construction is very small. Due to the plug-in structure, it can be installed and maintained online.
The base-type instrument can display on-site and control with alarm.
Cons
The thermal mass flow meter responds slowly.
Places where the measured gas composition changes greatly. Due to changes in the cp value and thermal conductivity, the measured value will vary greatly and cause errors.
For small flow, the meter will bring considerable heat to the gas to be measured.
For thermally distributed thermal gas mass flow meters, if the measured gas deposits a scale layer on the pipe wall, the measured value will be affected. Must be cleaned regularly. The thin tube type instrument has the disadvantage of being easy to be blocked, and it cannot be used under normal circumstances.
The use of pulsating flow will be restricted.
Thermal mass flow meters for liquids are also restricted in the use of viscous liquids.
Thermal mass flow meter applications
The thermal measuring principle is widespread in the industry, and is being used successfully in many applications with gas flow, for example:
Gas flow measurement in steel plants and coking plants;
Boiler air flow, measure secondary air volume;
Measurement of flue gas flow from chimney;
Measurement of waterfall gas flow in water treatment;
Gas flow measurement during the production process of cement, cigarette and glass factories;
Air and biogas measurement (e.g. in wastewater plants)
Applications of Thermal Mass Flow Meter
Thermal mass flow meter for liquids
Generally, Thermal mass flow meters produced in China are used to measure gas mass flow.
If you need to measure liquid mass flow. Please contact our sales engineer. We will provide you with detailed product recommendations.
Thermal mass flow meter installation
insertion mass flow meter:
Position determination: Keep away from elbows, solenoid valves, and other parts to ensure a stable flow field;
Welding of the welding base: drill a Φ22 round hole in the pipe, and weld the welding base;
Install the instrument: put the locking head into the probe rod during installation, and tighten it with a wrench after confirming the insertion depth;
It is recommended that the user adopt a continuous flow ball valve when selecting the model, which is easy to disassemble. Especially in the medium place that is harmful to the human body.
In the caliber smaller than DN300, the insertion depth is 1/2D+15mm. In the DN300-DN1000 caliber, the insertion depth is 1/4D+15mm. Above DN1000, the insertion depth is 1/8D+15mm.
When installing, first weld the special flange to the front and rear straight pipe sections.
Then clamp the front and rear straight pipe sections, gaskets, and instruments with stud bolts and connect them into one.
Then install this component on the pipeline. When installing, pay attention to the direction marked on the instrument should be consistent with the direction of the fluid.
Note:
(1) The integrated plug-in type should be inserted into the axis of the pipeline to be tested, so the length of the measuring rod depends on the diameter of the measuring pipe. It should be stated when ordering. If it cannot be inserted into the axis of the pipeline, the manufacturer will provide calibration coefficients to complete accurate measurement.
(2) The one-piece full-tube type adopts the national standard GB/T9119-2000 and is produced in accordance with the GB/T9119-2000 standard. (Other standards will be implemented after consultation and confirmation with the manufacturer.)
The meter can convert this relationship into a linear output, that measures the flow signal.
There are two design methods for the flowmeter manufactured, by the principle of thermal diffusion: one is based on the principle of constant temperature difference. The other is based on the principle of constant power.
Observe the recommended inlet and outlet requirements.
Good engineering practice is necessary for the associated pipe work and installation.
Ensure correct alignment and orientation of the sensor.
Take measures to reduce or avoid condensation (e.g. install a condensation trap, thermal insulation, etc.).
The maximum permitted ambient temperatures and the medium temperature range must be observed.
Install the transmitter in a shaded location or use a protective sun shield.
For mechanical reasons, and in order to protect the pipe, it is advisable to support heavy sensors.
No installation in where large vibration exists.
No exposure in the environment containing a lot of corrosive gas.
No sharing power supply with frequency converter, electric welding machine and other machines which can make power-line interference. If necessary, please add power conditioner for transmitter power supply
The minimum recommendations for inlet and outlet runs (without flow conditioner) are:
Thermal mass flow meter and Coriolis flow meter are both flow meters used to measure fluid mass flow rate.
The thermal type can only be used in gases. It uses the different heat conduction and absorption capabilities of various gases to measure the heat transfer or heat energy loss from heating to induction to correspond to the flow rate.
Thermal Mass Flowmeters have the characteristics of low pressure loss; large flow range; high precision, high repeatability and high reliability; no moving parts and can be used for extremely low gas flow monitoring and control. Utilizes the heat (or temperature) of the heated fluid Changing the mass flow of fluids has a long history.
The usual mass flowmeter refers to Coriolis flowmeter. Use the Coriolis principle (the interference of the earth’s rotation on the curved material) to directly measure the mass of fluid flowing through. Can measure gas and liquid.
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.
As mentioned earlier, the flow measurement values of commonly used flow meters, such as orifice flow meters, turbine flow meters, vortex flow meters, electromagnetic flow meters, rotameters, ultrasonic flow meters, and oval gear flow meters, are fluid. Volume flow.
A thermal mass flow meter measures the flow of gas or liquid using heat. Think of it like this: it heats up a small part of the fluid and then checks how quickly the heat moves. Faster heat movement means more fluid is flowing.
Thermal mass flow meters are usually very accurate. They can give readings that are close to the actual flow. But, just like any tool, they can sometimes be a little off. It’s always good to make sure they’re set up right for the best results.
No, they’re not the same. A vortex flow meter measures how swirls or “vortices” are made when fluid flows past an object. A thermal mass flow meter, on the other hand, uses heat. So, they work in different ways. Read more about: vortex flow meter straight run requirement.
There are many good thermal mass flow meters out there. The best one depends on what you need it for. It’s a good idea to talk to someone who knows a lot about them or read reviews before buying one.
Sino-Inst offer over 10 Thermal Mass Flow Meters, with Best Price.
Sino-Inst is Thermal Mass Flow Meter supplier and Manufacturer, 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 Thermal Mass Flow Meter respectively.
You can ensure product safety by selecting from a certified supplier, with ISO9001, ISO14001 certification.
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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.
