Characterization of a Controlled Clearance Piston Gauge Using Different Working Fluids up to 5 MPa

Abstract

A systematic study carried out to characterize the controlled clearance piston gauge in the pneumatic pressure region up to 5.09 MPa full-scale pressure using different working fluids such as argon, nitrogen, helium and hydrogen is described. The characterization was conducted/carried out by measuring the fall rate of the piston as a function of the jacket pressure (P j ) in order to determine the stall jacket pressure (P z ) corresponding to the zero clearance between the piston and cylinder. A comparatively greater reproducibility in the P z values is obtained for helium and hydrogen as compared to that of argon and nitrogen. The effects of the temperature of the operation on the fall rate in this piston gauge using gaseous nitrogen as the working fluid are also reported. It is observed that a small temperature fluctuation does not effect the overall uncertainly in the measured pressure.

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