Final report on key comparison APMP.M.P-K7.2 in hydraulic gauge pressure from 10 MPa to 100 MPa

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Main textThis report describes the result of the key comparison APMP.M.P-K7.2 in hydraulic pressure from 10 MPa to 100 MPa in gauge mode between National Institute and Metrology (Thailand) (NIMT) and National Metrology Laboratory-Industrial Technology Development Institute (Philippines) (NMLPHIL). The comparison was carried out between October 2015 and March 2016 within the framework of Asia Pacific Metrology Programme (APMP). The purpose of this comparison was to determine the degrees of equivalence between the hydraulic pressure standards maintained by NMLPHIL and NIMT in order to evaluate the relationship between the measurement result made by NMLPHIL and the CCM Key Comparison Reference Value (KCRV) through NIMT measurement result which was found in the key comparison APMP.M.P-K7. In this comparison NIMT was the pilot institute. Two hydraulic pressure transducers belonging to NIMT were used as the transfer standards. To ensure the reliability of the artifact, five complete measurements were performed before and during the comparison. Therefore, the behaviour of the transfer standards during the comparison period was well characterized. The degrees of equivalence of two national measurement standards were expressed quantitatively by the deviations from the key comparison reference values. In conclusion, the hydraulic pressure in the range from 10 MPa to 100 MPa in gauge mode, developed by the hydraulic pressure balance reference standards maintained by both participating NMIs were found to be fully equivalent under their claimed uncertainties. It can be concluded that the measurement result in hydraulic pressure from 10 MPa to 100 MPa in gauge mode, made by NMLPHIL has been corresponded to the CCM KCRV under the uncertainties claimed.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 https://www.bipm.org/kcdb/.The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).