Does the accuracy of the gas flowmeter have compensation measures?

Does the accuracy of the gas flowmeter have compensation measures? The measured flow has nothing to do with viscosity, temperature, pressure and conductivity; the measurement linearity is good (the time difference is proportional to the flow rate); the forward and reverse flow can be measured; the flowmeter can be calibrated by the volume of the measured medium; the performance-price ratio is high ( for insertion and mount type flowmeters). Ultrasonic flowmeters are also divided into monophonic and multi-channel. The monophonic ultrasonic flowmeter measures the average velocity on a certain diameter on the cross section of the pipe, which is the average velocity of the line, and it is the average velocity on the entire surface. There is a difference. Is there any compensation measure for the accuracy of the gas flowmeter? Gas flowmeters are susceptible to density, while liquid flowmeters are sensitive to changes in viscosity. Since density and viscosity are closely related to temperature and pressure, fluctuations in temperature and pressure are inevitable on site. Compensation measures must be taken according to the degree of their influence on precision in order to maintain high measurement precision. It can be seen that whether temperature and pressure correction is required when measuring gas flow depends on the selected flowmeter, depending on the specific situation. The multi-channel ultrasonic flowmeter measures the average velocity on multiple diameters on the cross-section of the pipe, and the total average velocity is close to the average velocity on the surface. Therefore, the measurement accuracy of the multi-channel ultrasonic flowmeter is higher than that of the monophonic one. . The flow rate measured by the differential pressure flowmeter is proportional to the square root of the differential pressure. When the temperature t and pressure p of the fluid change, the density of the fluid will change accordingly. The ultrasonic flowmeter can measure conductive or non-conductive media, toxic or corrosive media; the sensor of the ultrasonic flowmeter can be installed outside the pipeline without contact with the measured medium, so there is no need to cut off the pipeline or open holes during installation , just clamp the sensor on the surface of the pipeline, which is simple and easy to operate; therefore, the differential pressure flowmeter must be compensated for temperature and pressure when measuring flow. The flow measured by the electromagnetic flowmeter is actually not affected by the density, viscosity, temperature, pressure and conductivity of the fluid. According to the flow equation, the flow measured by the electromagnetic flowmeter has a linear relationship with the induced electromotive force. When the turbine flowmeter measures the flow, the physical properties of the fluid have a great influence on the characteristics of the meter. The accuracy of ultrasonic flowmeters varies greatly. Among ultrasonic flowmeters using the propagation time method, large-diameter pipe-section multi-channel flowmeters have higher accuracy, and the basic error is generally±0.5～1.0%R, multi-channel ultrasonic flowmeter can be as high as±0.25%R, clip-on type is generally±1.0～3.0%R. For Doppler ultrasonic flowmeters, the basic error is generally±3.0～10%FS, but when the content of solid particles remains unchanged, the accuracy can also reach±0.5～3.0%FS. The ultrasonic flowmeter can measure both liquid and gas. It can also measure two-phase fluids with low heterogeneous content, such as sewage, sewage, etc.; the diameter of the measuring pipe can range from a few centimeters to several meters. Theoretically, there is no limit to the upper limit of the pipe diameter, and the pipe can be circular or Square; non-restricted flow parts, the ultrasonic flowmeter does not hinder the flow of fluid in the pipeline when measuring, there is no pressure loss, and the operating cost is low; the measurement of liquid flow does not require high accuracy, and a single-channel ultrasonic flowmeter is sufficient. The ultrasonic flowmeter for measuring gas is usually multi-channel, and it cannot be measured by external clamping, and most of them use their own measuring pipe sections.

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