采用真空泵使气体分别流经高压浮子流量计和音速喷嘴装置,从而实现负压法实流标定高压气体浮子流量计。此法弥补了钟罩正吹法小口径管路流量较小以及反吹法操作繁琐,量程较小等缺陷,解决了高压损气体浮子流量计溯源难的问题。 A vacuum pump is used to make the gas flow through the high-pressure float flowmeter and the sonic nozzle respectively so as to realize the real-time calibration of the high-pressure gas float flow meter by the negative pressure method. This method is to make up for the bell is blowing small-caliber pipeline flow is small and the backflushing method is cumbersome, smaller range and other defects, to solve the problem of traceability of high pressure loss gas float meter.