20.500.12556/RUL-171061 Bilateral comparison of gas microflow primary standards in the range between 0.12 mg/min and 2.4 mg/min A bilateral comparison of small gas flow rates in the range between 0.12 mg/min and 2.4 mg/min was performed between INRiM (Italy) and LMPS (Slovenia). The primary standard at INRiM is a type of a motor driven piston prover. The primary standard at LMPS is a pVTt method with a static mass determination and flying start-stop. The transfer standard main part are two capillary leaks, with measuring ranges up to 0.25 mg/min and 2.5 mg/min respectively. A Hagen-Poiseuille equation with a constant geometric factor is used to calculate the mass flow rate. The comparison was carried out at five measurement points with the large capillary leak and at two points with the small capillary leak. The results show that there are statistically significant differences between the measurements of the two laboratories. The estimated uncertainties are also too large to confirm the target CMCs, as the repeatability of the measurements was too weak. gas flow measurement bilateral comparison microflow capillary transfer standard normalized error true false true Angleški jezik Ni določen Članek v reviji 2025-07-30 14:01:09 2025-07-30 14:01:12 2025-07-31 04:10:52 0000-00-00 00:00:00 2025 0 0 4 str. suppl., art. 101588 Vol. 38 May 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 533 2665-9174 10.1016/j.measen.2024.101588 234746371 Zibret__Bilateral_comparison.pdf Zibret__Bilateral_comparison.pdf 1 F87C367960F3451F03E864D48B7C0533 b1210af81a8960586e29ac5786a7478d56e5b4a64e4f62e2602ad71e6d4a2498 6f3e9237-6d3d-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=213793 https://www.sciencedirect.com/science/article/pii/S2665917424005646 1 f1b7e886-6d3c-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=213792 Fakulteta za strojništvo 0 0 0