Comparison of calibration of a rotary piston gas meter G650

Main text The supplementary comparison EURAMET.M.FF-S20 was organized for the purpose of determination of the degree of equivalence of the testing facilities for low-pressure gas flow measurement over the range (50 to 1000) m 3 /h. A rotary displacement gas meter IRM-3-DUO G650 was used as a transfer standard. The measurements were provided at prescribed reference conditions. Participants were nine laboratories from EURAMET: PTB, Germany; CMI, Czech Republic; FORCE TECHNOLOGY, Denmark; VSL, Netherlands; BEV, Austria; GUM, Poland; LEI, Lithuania; RISE, Sweden; METAS, Switzerland. All participants reported their traceability chains to the SI. Relevant results were used in the determination of the key comparison reference value (KCRV) and the uncertainty of the KCRV. The reference value was determined at each flow separately following procedure A presented by M G Cox. The degrees of equivalence with the KCRV were calculated. All reported results were consistent with the KCRV. To reach the main text of this paper, click on Final Report . 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).