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flow measurement;gas flow standard device;clearance-sealed;passive piston;traceability |
CHEN Chao,SONG Jin,ZHU Biyu |
Shanghai Institute of Measurement and Testing Technology, Shanghai 201203,China |
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Abstract In the low gas flow measurement area, passive gas piston prover with clearance-sealed are widely used, because it has the advantages of eazy operation, high measurement efficiency, no mercury seal, easy to carry, and has function of automatic temperature and pressure compensation. However, there is no calibration specification for passive gas piston prover with clearance-sealed in China,The reciprocating motion of the passive piston will cause pressure fluctuation in the measuring pipeline.The traceability for passive gas piston prover with clearance-sealed using flow measurement method directly still has some difficulties. In this situation, a new traceability method for calibration passive gas piston prover with clearance-sealed by geometry measurement method is detailed described, the uncertainty of the geometry measurement method is also evaluated, and comparison with relevant foreign institution is performed for uncertainty verification.The test results show that the passive gas piston prover with clearance-sealed can be calibrated by geometry measurement method perfectly.
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Received: 27 June 2023
Published: 23 May 2024
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