Causes of Measurement Errors of Vortex Flow Meters

Abstract: The information on the cause of the measurement error of the vortex flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Vortex flowmeter is mainly used for flow measurement of medium and fluid in industrial pipelines, such as air, liquid, steam, etc. Because the vortex flow has small pressure loss, large measuring range and high precision, it is almost not affected by fluid density when measuring the volume flow under working conditions. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article that causes the measurement error of the vortex flowmeter. Vortex flowmeters are mainly used for flow measurement of medium fluids in industrial pipelines, such as air, liquid, steam, etc. Because the vortex flow has small pressure loss, large measuring range and high precision, it is almost not affected by fluid density, pressure, temperature and viscosity when measuring the volume flow under working conditions. If it is reflected that the flow measurement is inaccurate during the use of the vortex flowmeter, the first thing to do is to judge which aspect is incorrect and cause the flow error. Then the reasons for the measurement error of the vortex flowmeter: 1. The influence of temperature on the measurement The temperature will have an impact on the medium measured by the general flowmeter, and the temperature will affect the density, viscosity, etc. of the medium, which will make the measurement results inaccurate. An error occurred. To eliminate this effect, the K coefficient is generally corrected. At present, the flow meters of some manufacturers have carried out fixed temperature correction and real-time temperature correction in the software for the influence of temperature. 2. The influence of the inconsistency between the inner diameter of the vortex flowmeter and the inner diameter of the flowmeter 3. The problem of model selection The actual model selection should choose the smallest diameter possible to improve the measurement accuracy. For example, a vortex street pipeline is designed for several When the equipment is used, because the process equipment is sometimes not used, the current actual flow rate is reduced, and the actual use causes the original design selection diameter to be too large, which is equivalent to increasing the lower limit of the measurable flow rate. The indication cannot be guaranteed when the flow rate of the process pipeline is small. It can also be used when the traffic is large, because it is sometimes too difficult to remodel. Changes in process conditions are only temporary. Can be combined with parameter re-tuning to improve indication accuracy. 4. The influence of accumulation on the upstream surface of the vortex generating body of the vortex flowmeter If there are viscous particles in the measured fluid, they may gradually accumulate on the upstream surface of the vortex generating body, so that the geometry and size of the vortex generating body will change. The coefficients also change accordingly, so pay attention to cleaning up in use. 5. Problems in installation The main problem in installation is the length of the straight pipe section in front of the vortex flowmeter sensor. If the length is not enough, the measurement accuracy will be affected. 6. Reasons for the direction of parameter setting The wrong product parameters lead to the wrong indication of the instrument. The parameter error makes the calculation of the full-scale frequency of the secondary instrument wrong, and the full-scale frequency is similar, which makes the indication inaccurate for a long time. The actual full-scale frequency is larger than the calculated full-scale frequency. The inconsistency affects the final determination of the parameters. Finally, the parameters are determined by re-calibration and mutual comparison, which solves such problems. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Causes of Measurement Errors of Vortex Flow Meters'

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