The performance of Coriolis flow meters designed for use in hydrogen refuelling stations was evaluated in air and nitrogen by several National Metrology Institutes and Designated Institutes. Three meters were tested by members of the MetroHyVe consortium; NEL, METAS and CESAME EXADEBIT. A fourth meter was tested separately by KRISS and there was found to be a significant overlap in the test conditions and results from each experimental programme. A wide range of conditions were tested overall, with gas flow rates ranging from 0.05 to 3.8 kg/min and pressures ranging from 10 to more than 40 bar. The densities encountered using air and nitrogen ranged from 11.5 to more than 52 kg/m~3 (equivalent to hydrogen at approximately 125 bar and 875 bar respectively). There was also some investigation of the influence of temperature on flow meter performance, with selected points tested at temperatures as low as -40°C. The effect of pressure was studied separately using water and is presented in another paper. When the flow meters were operated within the manufacturer's recommended flow rate ranges, errors were generally within ±1%. For some of the meters tested, errors approached ±0.5%.
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