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VACUUM ›› 2025, Vol. 62 ›› Issue (4): 29-33.doi: 10.13385/j.cnki.vacuum.2025.04.05

• Measurement and Control • Previous Articles     Next Articles

Test and Analysis of Volume Coefficient of Pressure Leak Calibration Device

YANG Chunjie, WAN Yupeng, GAO Xiaodi, ZHANG Haiding   

  1. National Institute of Measurement and Testing Technology, Chengdu 610021, China
  • Received:2025-01-03 Online:2025-07-25 Published:2025-07-24

Abstract: Accurate measurement of volume coefficient is the key for pressure leaks calibration by volume compensation pressure leak calibration device. In order to improve the measurement accuracy of the volume coefficient, the relationship between volume coefficient and differential pressure in two cases of without and with leaks was studied, and the consistency of volume coefficient of the same adjustable leak under different leak rates was tested in this paper. The volume coefficient was corrected by making simulation joints and correcting ΔP based on theoretical analysis of test results. Finally, the volume coefficient stability of the fixed value leak was tested. The results show that the accuracy and stability of the corrected volume coefficient test are significantly improved, and the test consistency of the two correction methods is less than 0.2%, and the stability is less than 0.5%.

Key words: pressure leak, volume coefficient, volume compensation method, differential pressure, leak rate

CLC Number:  TB77

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