Factors affecting the accuracy of flowmeters used to measure its volume flow
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Flow meters that require temperature and pressure compensation display values when there is no pressure in the pipeline; if these values are not reset, it may affect the accurate indication, leading to higher readings.
Flowmeters exhibit large errors at low flow rates; therefore, their parameter settings include a function for rejecting low-level signals. Additionally, to ensure accurate measurement, the selection parameters for flowmeters specify a minimum flow rate requirement. Without removing small signals, it has a certain impact on the cumulative flow rate, but it has no effect on flow measurement under normal operating conditions.
Why perform resection with a low flow rate? At low flow rates, the error is only larger; but if that portion is excluded, or if a fixed value is used for accumulation, wouldn’t the error become even greater? Resection with a small flow is not recommended.
For measuring gas flow rates, mass flow meters are generally used； If you think the price is too high, you can opt for a vortex flow meter, which generally comes with pressure and temperature compensation
Small-signal rejection is primarily used to eliminate disruptive flow rates. Under normal circumstances, it’s not possible to operate continuously at low flow rates; if operation does occur at such low levels, the readings will be inaccurate. Moreover, it’s not clear whether the value is too high or too low, so the resulting figures are meaningless
For gas flow measurement, whether using a mass flow meter or an vortex flow meter, their accuracy decreases significantly at low flow rates. If measurement is the purpose, it is advisable to employ signal attenuation for low signals; however, this step is not necessary if the device is used solely for flow regulation.
Voltage stabilization compensation is only used for density measurement; a velocity-type flow meter will naturally read zero as long as there is no flow rate (that is, when the medium is not moving).