Internal Measurement Assurance for the NIST Realization of the ITS-90 from 83.8 K to 1234.93 K

Published

October 1, 2003

Author(s)

Gregory F. Strouse

Abstract

The National Institute of Standards and Technology (NIST) is responsible for realizing, maintaining, and disseminating the International Temperature Scale of 1990 (ITS-90) to the United States of America. The ITS-90 fixed-point cells necessary to calibrate standard platinum resistance thermometers (SPRTs) require an extensive internal measurement assurance program to insure that the assigned fixed-point cell uncertainties are achieved. There are six interactive elements for the realization of an ITS-90 fixed-point cell that contribute to the uncertainty of an SPRT calibration. These six elements are the fixed-point cells, maintenance systems, SPRT, measurement system, realization techniques, and data analysis. Within these six elements, there are twenty-nine parameters that are used to quantify and maintain the NIST-assigned fixed-point cell and SPRT calibration uncertainties.

Proceedings Title

Eighth International Temperature Symposium | 8th | Temperature: Its Measurement and Control in Science and Industry; Volume Seven | AIP

Volume

684

Issue

Pt. 1

Conference Dates

October 21-24, 2002

Conference Title

AIP Conference Proceedings

Pub Type

Conferences

Download Paper

Local Download

Keywords

Fixed-Point Cell, Freezing-Point Cell, ITS-90, Measurement Assurance, Melting-Point Cell, SPRT, Statistical Process Control, Thermometer Calibration, Triple-Point Cell

Citation

Strouse, G. (2003), Internal Measurement Assurance for the NIST Realization of the ITS-90 from 83.8 K to 1234.93 K, Eighth International Temperature Symposium | 8th | Temperature: Its Measurement and Control in Science and Industry; Volume Seven | AIP, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=830792 (Accessed October 12, 2025)