Characterization Study of Gas-Air Relationship Measurement of Ultrasonic Gas Meter
As a new type of electronic measuring instrument,ultrasonic gas meter has the characteristics of wide range,no mechanical transmission structure,high sensitivity,etc.Air medium is generally used in the evaluation of metering characteristics of gas meters.Therefore,the consistency of metering performance under air medium and gas medium is crucial.Using the extended uncertainty U=0.25％(k=2)of the piston type real-gas flow standard device,the flow range of 0.04～6 m3/h and 0.025～4 m3/h of 1.5 grade ultrasonic gas meter gas-air relationship performance are tested respectively.The test results show that:1 #,2#,3#G4 ultrasonic gas meter at the flow pointqmingas-air average error shift is relatively large,while 4#,5#,6#G2.5 ultrasonic gas meter in each flow point error occurred in the general shift.This is caused by zero drift and wrong wave phenomenon respectively.Therefore,it is recommended to increase the gas-air relationship project in the inspection and measurement performance evaluation test of ultrasonic gas meters.The test results can provide important data references for the technical research and development of domestic ultrasonic gas meters and the improvement of calibration methods.
Ultrasonic gas meterMetrological characteristicsGas-air relationshipGas mediumMean error differencePiston type real-gas flow standard device
万方数据
维普
