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Description of measurement accuracy of vortex flowmeter

Measurement accuracy of vortex flowmeter
The accuracy of the vortex flowmeter is approximately ±0.5% R to ±2% R for liquids and 0.2% to 0.5% for gases at ±1% R to ±2% R. Because the meter coefficient of the vortex flowmeter is low, the frequency resolution is low, and the diameter is smaller, the instrument diameter should not be too large (below DN300).
Range width is a feature of vortex flowmeters, but what is important is the lower flow. Generally, the lower limit of the average flow rate of the liquid is 0.5 m/s, and the gas is 4 to 5 m/s. The normal flow rate of the vortex flowmeter is preferably 1/2 to 2/3 of the normal measurement range.
The meter factor of the vortex flowmeter is not affected by the physical properties of the measured medium. This is a great advantage. It can be applied to other media by a typical media check, which is convenient for solving the problem of the calibration device. However, it should be noted that the range of the flow rate of the liquid and gas varies greatly, so the frequency range also varies greatly. In the amplifier circuit that processes the vortex signal, the passband of the filter is different, and the circuit parameters are different. Therefore, the same circuit parameter cannot be used for different measurement media. As the medium changes, the circuit parameters should also change.
In addition, the density of gas and liquid varies widely, and the signal intensity produced by vortex separation is proportional to the density. Therefore, the signal intensity difference is also large, the gain of the liquid and gas amplifier circuits, the trigger sensitivity, etc. are all different, the piezoelectric charge difference is large, and the parameters of the charge amplifier are also different. Even if the same gas (or liquid, steam) varies with the medium pressure and temperature, the density is different, the flow range used is different, the signal strength is different, and the circuit parameters are also changed. Therefore, a vortex flowmeter is not modified by hardware or software, and it is not feasible to change the medium or change the gauge.

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