APMP.T-K3.4: key comparison of realizations of the ITS-90 over the range -38.8344 degree C to 419.527 degree C

• Published in: Metrologia 2016-01, Vol.53, p.1-1
• Main Authors: Joung, W, Gam, K S, Achmadi, A, Trisna, B A
• Format: Article
• Language: English
• Subjects: Calibration; Equivalence; Freezing point; Information dissemination; Linkages; Metrology; Pilots
• ISSN: 0026-1394; 1681-7575

The APMP bilateral key comparison APMP.T-K3.4 was initiated on the request from RCM-LIPI (Indonesia) to link their national standards to the average reference values (ARVs) of the CCT-K3. Korea Research Institute of Standards and Science (KRISS, Republic of Korea) provided the linkage to the CCT-K3 for temperatures ranging from -38.8344 degree C to 419.527 degree C. In the APMP.T-K3.4, two standard platinum resistance thermometers (SPRTs) were chosen as the transfer instruments and were calibrated at the ITS-90 fixed-points in the comparison range. The fixed-points in this comparison included Zn freezing point (419.527 degree C), Sn freezing point (231.928 degree C), In freezing point (156.5985 degree C), Ga melting point (29.7646 degree C), and Hg triple point (-38.8344 degree C). The comparison was carried out in a participant-pilot-participant sequence where KRISS served as the pilot. The linkage was based on the fixed-point resistance ratios of RCM-LIPI relative to the ARVs of the CCT-K3 via the difference between the fixed-point resistance ratios of KRISS and the ARVs of the CCT-K3. The temperature differences between the national standards of RCM-LIPI and the ARVs of the CCT-K3 were within the evaluated comparison uncertainties of the ATPM.T-K3.4. This report provides detailed information on the comparison results, linkage mechanism, and the Degree of Equivalence of the RCM-LIPI relative to the institutes having participated in the CCT-K3.