Necessity analysis of gas volume conversion device's calibration and discussion of calibration method
Gas flowmeter are divided into two types:gas flowmeter with volume conversion device and gas flowmeter without volume conversion device,the gas flowmeter with volume conversion device is wide-ly used because of its advantages such as trade settlement,signal transmission,data storage and so on.The calibration of gas flowmeter generally uses the gas flow calibration facility by means of critical flow venturi nozzles or by master meter method,and the calibration is only performed on the base table part,the volume conversion device has not been calibrated,so the accuracy and consistency of gas flowmeter can not be guaranteed.The calibration device developed in this paper can be used to calibrate the gas flowmeter volume conversion device with the functions of temperature(T)conversion,temperature and pressure(PT)conversion or temperature,pressure and compression factor(PTZ)conversion,it can solve the problem of gasflow meter source tracing difficult in Shandong Province and its surrounding are-as,it has great significance to ensure the accuracy of gas flowmeter volume conversion device.The cali-bration device developed in this paper is convenient for the user to send for calibration and improves the measuring accuracy of the gas flowmeter.
gas flowmetervolume conversion devicebase flowmetercalibration methodaccuracymetrology
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