Pressure metrology up to 5 MPa in different gas media

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Abstract
Two primary standard piston gauges of 2 and 5 MPa capacity used for gas pressure measurement in gauge conditions have been modified and improved. The performance of each was checked, particularly in connection with piston rotational frequency and fall rates, with three different gases (nitrogen, helium and carbon dioxide), and with regard to the possible influence of surface magnetisation and electrostatic charges. The two systems have been directly cross-floated, in order to test gauge sensitivity and the reproducibility of pressure measurements under different conditions of use. The overall uncertainty in the gauge pressure measurements with the two piston gauges in the 0.1 to 5 MPa range was always better than +or-14 PPM, with nitrogen as the pressurising gas.

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