Research and Realization of Mutual-Verification Method between Critical Flow Sonic Nozzle Gas Flow Standard Device and Bell Prover Gas Flow Standard Device

Wang Zhen

Abstract

Starting from the demand of solving the reliable calibration mode of gas flow standard device, the concept of synchronous mutual-verification of flow standard device is presented in this paper. On this basis, the two system mutual-verification device of positive pressure critical flow sonic nozzle gas flow device and inlet type bell prover gas flow device is established, and advanced control system circuit design is adopted to realize the two system automatic control. The high precision roots flowmeter is used as the mutual-verification instrument. The uncertainty (k = 2) of the two sets of flow devices is 0.28% and 0.16% respectively. Under the mutual-verification mode, judgment value En is 0.19 and 0.07 (0.45 MPa and 0.63 MPa) respectively, it shows that the measurement results of the two sets of devices have good consistency and reliability. Therefore, the effectiveness of mutual-verification method is verified, and it also have certain significance for the traceability of the value in the field of gas flowmeter measurement.

Keywords

Mutual-Verification; Bell Prover; Critical Flow Sonic Nozzle; Gas Flow Standard Device

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IMEKO-TC9-2019-006.pdf

DOI

10.21014/tc9-2022.006

IMEKO TC

TC9 - Flow Measurement

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