EUROMET Project 852: A comparison between Italian and Swiss gas flow standards in the range 0.3 m³/h to 25 m³/h

Abstract

An interlaboratory comparison (EUROMET Project 852) of four primary standard gas provers was carried out between the Italian and Swiss NMIs (IMGC/INRIM and METAS) from 0.3 m3/h to 25 m3/h using ambient air. The transfer standard was a G25 rotary piston meter. The comparison showed a full compatibility of all four provers above 4 m3/h, whereas at lower flows some discrepancies occurred, whose causes are discussed. The results generally confirm the improved accuracy of the large piston provers pioneered by both laboratories, if compared to bell provers, a couple of which were also tested.Main text. 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 kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by EURAMET, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).

Evaluation of the local value of the Earth gravity field in the context of the new definition of the kilogram

“…Finally, table 3 gives the coefficient E n (see equation ( 2)) [12], which evaluates the agreement between the measurement deviations found during the comparison and the uncertainties stated by the participants. An E n factor larger than one means that the difference between the values cannot be covered by the uncertainty.…”