CONTENTS 1.0 SUMMARY 29 33.2 1.3• vendor commitment -A firm commitment to accelerate FBR commercialization will entail heavy industry involvement, which has the effect of reducing cost and time uncertainties.3.17 10 J. P. Thereault

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).

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