While the flow of gas or steam is detected, measurement error can be brought by the change of medium condition.
检测气体或蒸汽流量时，介质的工况变化将引入测量误差。
The submitted instrument should be in a clean condition . for gas pressure calibration , the pressure medium will be nitrogen.
除特别要求外，本所将以氮作为气体压力校正的压力媒介。
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