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.
关键词
超声波燃气表/计量特性/燃气-空气关系/燃气介质/平均误差偏移/活塞式实气流量标准装置
Key words
Ultrasonic gas meter/Metrological characteristics/Gas-air relationship/Gas medium/Mean error difference/Piston type real-gas flow standard device
维普
万方数据