Bell prover — calibration and monitoring of time stability

Abstract

This paper is focused on the calibration and measurement of the geometric parameters of a bell prover that serves as a standard of volume of gas flow. It also includes methods for monitoring the time stability of the bell prover: intra-and inter-laboratory comparison measurements, Shewhart analysis and planned evaluation of recalibration intervals.

The new method for calibration and testing of the bell type prover

“…This method provides good accuracy, but technically is rather difficult, especially in the cases of big bells Furthermore, the method does not ensure consideration of the effect of pressure variability. The method is described in detail in [3] The main goal of bell prover calibration is to evaluate the link between the bell displacement dH and the displaced air volume dVair. The volume of displaced air at actual temperature and pressure values equal to the change in the volume non-immersed part of the bell dVbell.…”