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Bobovnik, G; Kutin, J
Journal of physics. Conference series, 08/2018, Volume: 1065, Issue: 9Journal Article
A piston prover measures the gas flow rate by determining the time interval that a piston needs to pass a known volume of gas at a defined pressure and temperature. In the clearance-sealed piston prover the leakage flow rate through the clearance between the cylinder and the piston represents the key contribution to the measurement uncertainty at the lowest measured gas flow rates. The article presents the measurement procedure for the leakage flow rate under operating conditions of the piston prover and evaluates some influence parameters on its magnitude; i.e., the measured flow rate, the gas viscosity and the flow cell inclination.
