ITS-90 SPRT Calibration from the Ar TP to the Zn FP

Published

March 30, 2023

Author(s)

Michal J. Chojnacky, Tobias Herman, Ken Hill, Steffen Rudtsch, Inseok Yang, Petrus Paulus Maria Steur, Roberto Dematteis, Lopardo Lopardo, Fernando Sparasci, Catherine Martin, Lara Risegari, Januarius Widiatmo, Tohru Nakano, Ikuhiko Saito, Klaus Natorf Quelhas, Patricia Giorgio, Jianping Sun, Jintao Zhang, Jonathan Pearce, Jayne Gray

Abstract

This is a report to the Consultative Committee for Thermometry (CCT) on the key comparison 9 of SPRT calibration on the International Temperature Scale of 1990 (ITS-90) from 83.8058 K (the Ar triple point) to 692.677 K (the Zn freeze point). The comparison followed a collapsed star protocol, with each of the fourteen participating laboratories shipping two standard platinum resistance thermometers (SPRTs) as transfer standards to the pilot laboratory (National Institute of Standards and Technology, NIST) for a direct comparison of SPRT calibration at the National Metrology Institute (NMI) of origin to calibration at NIST. Measurements were taken at the participating laboratories before and after measurement at NIST to asses the effect of transportation on the transfer standards. The pooled results from all laboratories were combined to calculate a key comparison reference value (KCRV). This report includes the calculation of, and comparisons to, the KCRV as well as bilateral comparisons between labs. In addition, there is space devoted to analysis of the scatter in shifts in SPRT values following travel.

Citation

BIPM

Pub Weblink

https://bipm.org/

Pub Type

Websites

Download Paper

https://doi.org/10.1088/0026-1394/60/1A/03001

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Keywords

temperature metrology, key comparison

Citation

Chojnacky, M. , Herman, T. , Hill, K. , Rudtsch, S. , Yang, I. , Steur, P. , Dematteis, R. , Lopardo, L. , Sparasci, F. , Martin, C. , Risegari, L. , Widiatmo, J. , Nakano, T. , Saito, I. , Natorf Quelhas, K. , Giorgio, P. , Sun, J. , Zhang, J. , Pearce, J. and Gray, J. (2023), ITS-90 SPRT Calibration from the Ar TP to the Zn FP, BIPM, [online], https://doi.org/10.1088/0026-1394/60/1A/03001, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=934128, https://bipm.org/ (Accessed October 3, 2024)