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Improved methods for comparing gas and hydraulic pressure balances

Two methods for comparing the pressures of different media generated by gas and hydraulic pressure balances are examined in order to improve the consistency between gas and hydraulic pressure standards. One method uses a gas–liquid separator and the other uses a liquid-lubricated pressure balance. The pressure range examined is 0.5 MPa to 7 MPa. For both methods, a precise pressure transducer is used as a comparator to determine the equilibrium state between the two pressure balances. In this paper, the measurement results and the uncertainties obtained for the respective methods are presented. It is shown that the results obtained by using both methods agree within the combined standard uncertainty over the entire pressure range. Thus, both methods examined in this study are found to be useful for comparing gas and hydraulic pressure balances accurately.