Metrology 101: Piston Prover Design with Additional Measurement Capabilities and Reduced Flow Interaction

Piston Clearance Flow Dynamics

by Edward Morrell

High-speed clearance sealed piston provers for measuring gas flow rates have been available for over twenty years and have gained wide acceptance as a fast, cost-effective, primary calibration instrument for gas flow.  High-speed piston provers are available for measuring flow rates from 0.5 sccm to 500,000 sccm with measurement uncertainties of up to 0.15%.  This paper describes new advances in high-speed piston prover design. Read Full Article (PDF)