Henri Baumann et al 2008 Metrologia 45 07011 doi:10.1088/0026-1394/45/1A/07011
Henri Baumann1, Giorgio Cignolo2, Mario Clausen1 and Roberto Goria2
Show affiliationsAn 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.
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Issue 1A ( 1 January 2008)
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