Correction coefficient for the the tested flow meter due to the measurement error of standard device water density
The working scale of the static mass method water flow standard device,namely the electronic balance,must undergo air buoyancy correction when weighing the mass of water,which is clearly re-quired in the verification regulations of the liquid flow standard device.In practical applications,the den-sity of standard device water is usually obtained by the lookup table method,and there is no online real-time measurement,which has a certain error with the density value of actual water use.Moreover,the standard value provided by the quality method water flow standard device is the mass flow rate.When cal-ibrating speed type and volume type flow meters,it is necessary to convert them into volumetric flow rate for comparison.At this time,the accuracy of water density values is even more important.According to the principle of error,the correction of air buoyancy and the conversion of mass flow rate and volume flow rate are publicized,and the correction coefficient of the error of water density value on the indication error of the tested flow meter is obtained.This can intuitively obtain the correction value of the indication error of the tested flow meter,making the calibration of the flow meter more accurate.
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