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Title: A Primary Standard Piston Prover For Measurement Of Very Small Gas Flows
Author: Giorgio Cignolo, Gaetano La Piana
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: A high-accuracy prover is described, which is the new Italian national standard for gas flow rates in the range 1 mL/min to 1 L/min. The prover (full capacity: 3 liters) measures volume changes implemented by means of a massive, motor-operated piston which is introduced into (or extracted out of) a temperature-controlled ( 10 mK) chamber containing the working gas at near ambient conditions. The prover can either deliver or collect measured gas flows, depending upon the type of instrument to which it is connected piston displacements are measured by means of a laser interferometer. Motor speed is controlled in such a way that gas delivery is made at constant rate, whereas variable incoming flows can be measured at constant pressure. Owing to the accurate measurement of temperatures and pressures, the mass flow rate can be inferred to practically the same high accuracy as the volume flow rate (relative standard uncertainty: 0.013% to 0.03%).

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