Establishment and Verification of Mercury-Sealed Piston Prover for Primary Standard

Ying-Chun Lin, Win-Ti Lin, Chun-Lin Chiang,

Abstract

This paper presents the establishment and verification of a mercury-sealed piston prover, which is commonly used for low pressure gas flow calibration. The calibration gases could be dry air, nitrogen, argon, helium, oxygen and carbon dioxide. The flow capacity of the new system covers from 0.002 L/min to 40 L/min at 23 °C and 101.325 kPa, and some overlapped flows are between various columns. The relative expanded uncertainty of mass flow measurement is less than 0.08 % at 95 % confidence level.<BR />We were also successfully altering the temperature sensor construction, temperature sensor placement, data logger system to real-time monitor the temperature difference of the entering gas. The data showed that the temperature difference between the entering gas and column could approximate in the calibration period.<BR />The newly piston prover measurement result between different column was less than 0.01 %. A comparison between new-constructed and original CMC submitted piston prover that both are in CMS was conducted, and the En value was less than 0.4. The results indicate that the measurement capabilities of each column of newly piston prover were identical with expectation.

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IMEKO TC

TC9 - Flow Measurement

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