Primary Piston Prover Intercomparison Between PTB, VSL and FORCE Technology

Arnthor Gunnarsson, Jos van der Grinten, Mijndert van der Beek, Bodo Mickan

Abstract

The EuReGa members that use a Piston Prover as a primary calibration device (PTB, VSL and FORCE Technology) performed an intercomparison in 2018-2019. This paper will describe the Piston Provers used in the intercomparison after which the intercomparison results and their implication will be presented. <BR />Degree of equivalence has been determined on multiple occasions in the past between the participants. What distinguishes this intercomparison from others is that it is performed with Piston Provers, which is the starting point in the respective participants traceability systems. This means that the CMC reported in the intercomparison is lower compared to previous intercomparisons between the participants, with reported CMC uncertainty between 0.07% and 0.086%. The traceability of the participants is independent from each other, since the results are directly traceable to the participants respective Piston Provers, the Piston Provers being primary calibration systems traceable to length.<BR />EuReGa consists of four members with established traceability chains, LNE-LADG, PTB, FORCE Technology and VSL. LNE-LADG did not participate in the intercomparison because they use a PVTt system to establish their traceability.<BR />The results support the CMC claims of the participants, showing that also at the starting point in the traceability, and therefore at the low end of the uncertainty spectre of the participants, there are acceptable differences between the members of EuReGa. The intercomparison report for this project has been submitted under EURAMET project no. 1301 which forms a basis for this report.

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IMEKO TC

TC9 - Flow Measurement

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