Final report on COOMET.T-K3.1: Comparison of the realizations of the ITS-90 from 0.01 °C to 419.527 °C

Abstract

This report presents the results of the COOMET regional key comparison corresponding to CCT-K3 and covering the temperature range from 273.16 K (triple point of water) to 692.77 K (freezing point of Zn). Two national metrology institutes, the VNIIM (Russian Federation) and the National Scientific Center 'Institute for Metrology' (Ukraine), participated in this regional COOMET comparison. The VNIIM was appointed as the pilot laboratory and the coordinator of the comparison. The link between the regional and key comparisons was provided by VNIIM.One platinum resistance thermometer was used as transportable standard. The thermometer calibrated in VNIIM was transferred to the National Scientific Center 'Institute for Metrology'. After measurements at the National Scientific Center 'Institute for Metrology' the thermometer came back to VNIIM and was calibrated for control of its stability.The report contains the results of this comparison and detailed information about the method of estimation of the degrees of equivalence of the standards of the participating laboratories and their uncertainties.The degrees of equivalence of the national standards that took part in the regional comparison COOMET.T-K3.1 were determined relative to the average reference value of the comparison CCT-K3. The results of measurements carried out by VNIIM in comparisons CCT-K3 and COOMET.T-K3.1 were used for this purpose.This report supersedes item 03001 in the Technical Supplement of 2010.Main text.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 kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCT, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).