Flowmeter calibration apparatus

摘要

A heat type mass flowmeter calibration apparatus includes standard heat type mass flowmeters and sonic nozzle type mass flowmeters connected in series. Periodically or when required, the national-standard-traceable sonic nozzle type mass flowmeter that is traceable with respect to a national standard is used to calibrate the standard heat type mass flowmeters. Actual flowmeter measurements are conducted using the calibrated standard heat type mass flowmeter values. Therefore, consistently high precision of calibrations and measurements is guaranteed.