WP2 – FPG and FRS piston gauges

Development of FPG and FRS piston gauges as primary and secondary absolute and gauge pressure standards

The aim of this work package is to establish Force-balanced Piston Gauges (FPG) and Furness Rosenberg Standard (FRS) piston gauges [2.1, 2.2] as primary and secondary absolute and gauge pressure standards in the pressure range from approximately 1 Pa to 15 kPa with a target uncertainty below 0.01 Pa + 1.4 10-5 p.

These instruments are widely used by NMIs and accredited calibration laboratories, and their low uncertainty capabilities have been demonstrated in a recent EURAMET comparison [2.3]. However their SI traceability in Europe is based on a calibration against primary pressure standards above approximately 5 kPa and an extrapolation at lower pressures.

To enable the use of these instruments as primary standards, the flow between the piston and cylinder have to be better understood so a theoretical model for the effective area as a function of the geometrical dimensions can be made.

Contact: Dominik Pražák (dprazak@cmi.cz)

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