Improvement and Analysis of Low Pressure Gas Flow Calibration System - Bell Prover

Chih-Shan Yen, Ying-Chun Lin, Win-Ti Lin, Sheng-Cyuan Fan

Abstract

Bell Prover is the primary standard system for low-pressure gas by National Measurement Laboratory. When Bell Prover conducts calibration, the density of the gas inside the bell jar must be determined by the measurement of the pressure and temperature of the gas inside the bell jar. It is essential to accurately measure the representative temperature of the bell jar interior. After the system is redesigned in temperature control and temperature measurement methods, the half interval of the measurement error due to temperature stratification inside the bell jar is reduced from the original 0.1 ℃ drops to 0.05 ℃, and the relative expanded uncertainty of the entire system drops from 0.11 % to 0.09 %.

Keywords

Bell Prover; gas temperature measurement; measurement uncertainty

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IMEKO-TC9-2019-004.pdf

DOI

10.21014/tc9-2022.004

IMEKO TC

TC9 - Flow Measurement

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