CIPM MRA COMPARISON REPORTS

KEY COMPARISON

APMP.M.FF-K6.2018

Low pressure gas flow

W. Kang , C. Li , S. Wang , Y. Zeng , S. Masri , H.N. Nguyen , S.K. Jaiswal , W.T. Lin , F.M. Cholil

Citation W. Kang et al 2026 CIPM MRA Comparison reports 07010

https://doi.org/10.59161/GMNG4770

Authors

Woong Kang Korea Research Institute of Standards and Science (KRISS) Korea, Republic of

Chunhui Li National Institute of Metrology (NIM) China

Steven Wang National Measurement Institute, Australia (NMIA) Australia

Yan Zeng National Metrology Centre, Agency for Science, Technology and Research (NMC, A*STAR) Singapore

Sutham Masri National Institute of Metrology (Thailand) (NIMT) Thailand

Hoang Nam Nguyen Viet Nam Metrology Institute, Directorate for Standards and Quality (VMI-STAMEQ) Viet Nam

Shiv Kumar Jaiswal CSIR National Physical Laboratory of India (NPLI) India

Win-Ti Lin Industrial Technology Research Institute/Center for Measurement Standards (CMS/ITRI) Chinese Taipei

Fahmy Munawar Cholil National Measurement Standard - National Standardization Agency of Indonesia (SNSU-BSN) Indonesia

Abstract

The regional comparison, APMP.M.FF-K6.2018, was conducted to assess the degree of equivalence of national primary standards for low-pressure gas flow measurement among nine National Metrology Institutes (NMIs) in the Asia-Pacific region over the range from 10 m³/h to 100 m³/h. The comparison was linked to the key comparison reference value (KCRV) established by the CIPM key comparison CCM.FF-K6.2011 through three linking laboratories: KRISS (Republic of Korea), NIM (China) and NMIA (Australia). KRISS coordinated the comparison and acted as the pilot laboratory, with an Itron Delta S-Flow G65 rotary gas meter (DN50) used as the transfer standard. The stability of the transfer standard was monitored throughout the comparison, and the results were analysed in accordance with the method proposed by Cox. The results of the participating laboratories were linked to the KCRV by correcting for the results obtained by the linking laboratories in the CIPM key comparison. The degrees of equivalence of all participating laboratories were found to satisfy |E_n| ≤ 1, demonstrating consistency with the KCRV. The results provide supporting evidence for the calibration and measurement capabilities claimed by the participating NMIs.

Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.

The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

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