Comparison of Vortex Flow Meters and Turbine Flow Meters?

Abstract: Comparison of vortex flowmeter and turbine flowmeter? Information is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Vortex flowmeters are mainly used for flow measurement of medium fluids in industrial pipelines, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range and high precision, and is almost independent of fluid density, pressure, temperature, etc. when measuring the volume flow under working conditions. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is a comparison of vortex flowmeters and turbine flowmeters? The article details. Vortex flowmeters are mainly used for flow measurement of medium fluids in industrial pipelines, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range, high precision, and is almost not affected by parameters such as fluid density, pressure, temperature, viscosity, etc. when measuring the volume flow of the working condition. No moving mechanical parts, so high reliability and low maintenance. Instrument parameters can be stable for a long time. The vortex flowmeter adopts piezoelectric stress sensor, which has high reliability and can work in the working temperature range of -20℃～+250℃. There are analog standard signals and digital pulse signal output, which is easy to be used with digital systems such as computers. It is a relatively advanced and ideal measuring instrument. The working principles of the two are different, the detection methods of the two are different, and the structure is different! To put it simply, turbine flowmeters are volumetric flowmeters that generate pulsed currents from changes in magnetic flux, while vortex flowmeters measure flow by detecting frequencies; therefore, we usually use liquid turbine flowmeters and the like. Vortex flowmeters can be used in almost all occasions where a vortex column can be formed, not only for closed pipes, but also for open grooves. Compared with turbine flowmeters, vortex flowmeters have no moving mechanical parts , The maintenance workload is small, and the instrument constant is stable. 1. Good repeatability, short-term repeatability can reach 0.05%-0.2%, precisely because of its good repeatability, such as frequent calibration or online calibration, high accuracy can be obtained, and it is the preferred flowmeter in trade settlement. . 2. High accuracy, generally for liquids±0.25%-±0.5%, high precision type can reach±0.15%; while the medium is gas, generally±1%-±1.5%, special type is±0.5%-±1%. It is the most accurate of all flow meters. 3. Output pulse frequency signal, suitable for total measurement and connection with computer, no zero drift, strong anti-interference ability. 4. Turbine flowmeter is not suitable for higher viscosity medium. With the increase of viscosity, the lower limit of flowmeter measurement increases, the range is reduced, and the linearity becomes worse. 5. The physical properties of the fluid (density, viscosity) have a great influence on the characteristics of the instrument. Gas flow meters are susceptible to density, while liquid flow meters are sensitive to changes in viscosity. Since density and viscosity are closely related to temperature and pressure, fluctuations in temperature and pressure are unavoidable in the field. Compensation measures should be taken to affect the degree of accuracy according to the physical properties of various fluids. Liquid turbine flowmeters should be used for liquids. , the gas should use the corresponding gas turbine flowmeter, so as to maintain high measurement accuracy. 6. The requirements for the cleanliness of the measured medium are high, which limits its application field. Although a filter can be installed to adapt to the dirty medium, it also brings side effects such as increased pressure loss and increased maintenance. Turbine flowmeters account for 70%~80% of foreign product oil measurement, and are often used in domestic calibration flow. As long as the medium is clean and regularly calibrated, turbine flowmeters can achieve accuracy that other flowmeters are difficult to achieve. The vortex street has a small flow dead zone, and the measurement range is larger than that without a turbine. In terms of accuracy, the turbine can achieve higher accuracy, but the turbine has a movable impeller rotating, and the wear of the bearing will affect the measurement accuracy over time. Adjust the coefficients frequently. In addition, in terms of the frequency of the occasion, turbine flowmeters are not commonly used as vortex flowmeters. The accuracy of turbine flowmeters is relatively high and is often used for metering. Vortex flowmeters can be used for general flow measurement; the accuracy of vortex flowmeters degrees for liquids are approximately in±0.5%R~±2%R for gas at±l%R~±2%R, repeatability is generally 0.2%~0.5%. Because the meter coefficient of the vortex flowmeter VSF is low, the frequency resolution is low, and the larger the diameter, the lower the diameter, so the diameter of the meter should not be too large. The wide range is the characteristic of VSF, but the important thing is how much the lower limit flow is. Generally, the lower limit of the average flow velocity of liquid is 0.5m/s, and that of gas is 4~5m/s. The normal flow of VSF is best at 1/2~2/3 of the normal measurement range. The instrument coefficient of VSF is not affected by the physical properties of the measuring medium, which is a great advantage. It can be calibrated with a typical medium and applied to other media, which is convenient for solving the problem of calibration equipment. However, it should be seen that due to the large difference in the flow rate range of liquid and gas, the frequency range is also very different. In the amplifier circuit processing the vortex signal, the passband of the filter is different, and the circuit parameters are also different. Therefore, the same circuit parameters cannot be used for different measurement media. When the medium changes, the circuit parameters should also change accordingly. Gases and liquids have very different densities, and the strength of the signal generated when the vortex separates is proportional to the density.

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