Abstract
The calibration facility was newly constructed for high-pressure hydrogen gas flow meters. This facility can supply hydrogen gas of 350 Nm3/h at 35 MPa continuously for about 10 min. The calibration facility has the multi-nozzle calibrator, in which five critical nozzles calibrated by the NMIJ standards, are equipped, and can measure hydrogen gas flow rate within the relative standard uncertainty of 0.18 %. Also, the Coriolis flow meter for high pressure hydrogen were calibrated and evaluated by this calibration facility, and its output was scattered within about ±1.5 %. The present results show that the calibration facility constructed is useful for the evaluation of the high-pressure hydrogen gas flow meters, as well as the calibration.
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