The working principle, characteristics and installation requirements of Coriolis mass flow meter
2024-04-22
The Coriolis Mass Flow Meter is an instrument that uses the Coriolis effect to measure the mass flow of fluid. The Coriolis effect refers to the fact that when a fluid passes through a laterally constrained tube, a transverse temperature difference perpendicular to the direction of the fluid flow and magnetic field will be generated due to the rotation of the fluid itself and the collision between the fluid molecules. The Coriolis effect is caused by the interaction of a magnetic field induced by a current on a transversely constrained wire with electrons and ions in the fluid.
1. Coriolis flowmeter working principle
Coriolis flowmeters operate on the principle of motion mechanics. When the process fluid enters the sensor, the fluid will separate. During the measurement process, the driving coil will stimulate the pipe to vibrate against its natural resonance frequency. When the pipe vibrates, the voltage generated on each sensor forms a sine wave. This can represent the motion of one tube with respect to another. The time lag between the two sine waves is called Delta-T, and this value is proportional to the mass flow rate.
Coriolis force mass flowmeter (also known as Coriolis mass flowmeter) is a kind of mass flow meter with high measurement accuracy. The principle is based on Newton's second law when a fluid flows through a vibrating tube, it creates a Coriolis force proportional to the mass flow rate. When there is no fluid flowing, the vibration tube does not distort, and the signals detected by the electromagnetic signal detector on both sides of the vibration tube are in phase. When there is a fluid passing by, the vibration tube will distort 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, which is multiplied by the flow calibration factor to determine the mass flow rate.
2. Coriolis flowmeter features
Coriolis force mass flowmeter has high measurement accuracy, can ensure the accuracy of 0.1~0.2%, withstand low temperature medium, vibration amplitude is relatively small, no moving parts, reliable and stable operation, easy to operate, low maintenance rate easy to maintain, can directly measure the mass flow of the medium and the real-time density of the fluid, can be said to be a very convenient density instrument. It has integrated temperature and pressure compensation, direct output quality or standard, self-test program in the instrument, the fault phenomenon is clear at a glance, has a variety of outputs, can transmit a variety of data, can choose a variety of anti-corrosion and high and low temperature resistance materials, with optional small signal excisions, nonlinear correction, filtering time for users to choose.
When the fluid medium in the process pipeline contains gas, when the gas content exceeds a certain value, it will significantly affect the measured value of the Coriolis force mass flowmeter, resulting in inaccurate measurement results. Therefore, Coriolis force mass flowmeter cannot be used for the measurement of gas-liquid two-phase fluids.
Coriolis force mass flowmeter for field installation requirements are also relatively low, because Coriolis force mass flowmeter corresponding flow rate distribution is not very sensitive, so Coriolis force mass flowmeter for installation of the upper and lower straight pipe section requirements are not high.
3. Coriolis flowmeter installation requirements
①The installation position of the Coriolis mass flow meter must be based on the principle of interference sources that can cause pipeline vibration, such as the pump o n the process pipeline, if the sensor is used in series on the same pipeline, the sensor distance should be at least three times the width of the sensor size due to the interaction caused by resonance.
②The installation position needs to pay attention to the expansion or deformation of the process pipeline due to temperature changes, but can not be installed near the expansion joint of the process pipeline, if installed near the position, due to the expansion of the pipeline will cause transverse stress, so that the sensor zero change will affect the measurement accuracy.
③The installation position also needs the principle of industrial electromagnetic interference sources, such as transformers, high-power motors and other equipment near, otherwise the measurement tube in the sensor will be disturbed by self-vibration, the weak signal monitored by the speed sensor may be submerged in the noise of electromagnetic interference, and away from the interference source equipment at least 5m distance.
④The sensor installation position should always ensure that the fluid in the pipeline is full of the sensor measuring tube, and there is a certain amount of pressure, which requires the installation position should be at the low end of the pipeline.
In short, Coriolis mass flowmeter uses Coriolis effect principle to measure the mass flow of fluid, has the advantages of high precision mass flow measurement, wide measurement range, strong anti-interference ability, fast response speed, etc., is widely used in chemical industry, electric power, oil, natural gas and other fields.
If you want to know more about the flow meter or flow meter selection, please consult the Aister flow meter manufacturer email: sales@aistermeter.com for help.
1. Coriolis flowmeter working principle
Coriolis flowmeters operate on the principle of motion mechanics. When the process fluid enters the sensor, the fluid will separate. During the measurement process, the driving coil will stimulate the pipe to vibrate against its natural resonance frequency. When the pipe vibrates, the voltage generated on each sensor forms a sine wave. This can represent the motion of one tube with respect to another. The time lag between the two sine waves is called Delta-T, and this value is proportional to the mass flow rate.
Coriolis force mass flowmeter (also known as Coriolis mass flowmeter) is a kind of mass flow meter with high measurement accuracy. The principle is based on Newton's second law when a fluid flows through a vibrating tube, it creates a Coriolis force proportional to the mass flow rate. When there is no fluid flowing, the vibration tube does not distort, and the signals detected by the electromagnetic signal detector on both sides of the vibration tube are in phase. When there is a fluid passing by, the vibration tube will distort 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, which is multiplied by the flow calibration factor to determine the mass flow rate.
2. Coriolis flowmeter features
Coriolis force mass flowmeter has high measurement accuracy, can ensure the accuracy of 0.1~0.2%, withstand low temperature medium, vibration amplitude is relatively small, no moving parts, reliable and stable operation, easy to operate, low maintenance rate easy to maintain, can directly measure the mass flow of the medium and the real-time density of the fluid, can be said to be a very convenient density instrument. It has integrated temperature and pressure compensation, direct output quality or standard, self-test program in the instrument, the fault phenomenon is clear at a glance, has a variety of outputs, can transmit a variety of data, can choose a variety of anti-corrosion and high and low temperature resistance materials, with optional small signal excisions, nonlinear correction, filtering time for users to choose.
When the fluid medium in the process pipeline contains gas, when the gas content exceeds a certain value, it will significantly affect the measured value of the Coriolis force mass flowmeter, resulting in inaccurate measurement results. Therefore, Coriolis force mass flowmeter cannot be used for the measurement of gas-liquid two-phase fluids.
Coriolis force mass flowmeter for field installation requirements are also relatively low, because Coriolis force mass flowmeter corresponding flow rate distribution is not very sensitive, so Coriolis force mass flowmeter for installation of the upper and lower straight pipe section requirements are not high.
3. Coriolis flowmeter installation requirements
①The installation position of the Coriolis mass flow meter must be based on the principle of interference sources that can cause pipeline vibration, such as the pump o n the process pipeline, if the sensor is used in series on the same pipeline, the sensor distance should be at least three times the width of the sensor size due to the interaction caused by resonance.
②The installation position needs to pay attention to the expansion or deformation of the process pipeline due to temperature changes, but can not be installed near the expansion joint of the process pipeline, if installed near the position, due to the expansion of the pipeline will cause transverse stress, so that the sensor zero change will affect the measurement accuracy.
③The installation position also needs the principle of industrial electromagnetic interference sources, such as transformers, high-power motors and other equipment near, otherwise the measurement tube in the sensor will be disturbed by self-vibration, the weak signal monitored by the speed sensor may be submerged in the noise of electromagnetic interference, and away from the interference source equipment at least 5m distance.
④The sensor installation position should always ensure that the fluid in the pipeline is full of the sensor measuring tube, and there is a certain amount of pressure, which requires the installation position should be at the low end of the pipeline.
In short, Coriolis mass flowmeter uses Coriolis effect principle to measure the mass flow of fluid, has the advantages of high precision mass flow measurement, wide measurement range, strong anti-interference ability, fast response speed, etc., is widely used in chemical industry, electric power, oil, natural gas and other fields.
If you want to know more about the flow meter or flow meter selection, please consult the Aister flow meter manufacturer email: sales@aistermeter.com for help.
Share To：
News
- Why is the thermal gas mass flowmeter not affected by pressure strength and temperature?
- What to do when a thermal gas mass flow meter fails?
- How are thermal gas mass flow meters used? What are the applications?
- Under what circumstances is the gas measurement need to be regulated compensated vortex flowmeter
- Why Is The Aister Thermal Gas Mass Flowmeter So Popular ?
- Gas turbine flowmeter manufacturers explain their main advantages in measurement
- Gas turbine flowmeter manufacturer Aister instrument field experience summary
- Aister Instrument Empowerment Conference
