Bilateral comparison of gas microflow primary standards in the range between 0.12 mg/min and 2.4 mg/min

Žibret, Primož (author), Spazzini, Pier Giorgio (author), Bobovnik, Gregor (author), Kutin, Jože (author)

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.

• Language: English
• Keywords: gas flow measurement, bilateral comparison, microflow, capillary transfer standard, normalized error
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 4 str.
• Numbering: Vol. 38, suppl., art. 101588
• PID: 20.500.12556/RUL-171061
• UDC: 533
• ISSN on article: 2665-9174
• DOI: 10.1016/j.measen.2024.101588
• COBISS.SI-ID: 234746371
• Publication date in RUL: 30.07.2025

Record is a part of a journal

• Title: Measurement : Sensors
• Publisher: Elsevier
• ISSN: 2665-9174
• COBISS.SI-ID: 56318211

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Projects

• Funder: UKRI - UK Research and Innovation
• Project number: 10064205
• Name: Met4H2 Clean Hydrogen

• Funder: Other - Other funder or multiple funders
• Funding programme: European Union’s Horizon 2020
• Project number: 21GRD05
• Name: /