Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

NIST-NRC COMPARISON OF TOTAL IMMERSION LIQUID-IN-GLASS THERMOMETERS

Published

Author(s)

Kendra Hill, D.J. Gee, Christina D. Cross, Gregory F. Strouse

Abstract

The use of liquid-in-glass thermometers is described in many documentary standards in the fields of environmental testing, material testing, and material transfer. Many national metrology institutes, including the National Institute of Standards and Technology (NIST) and the National Research Council of Canada (NRC), list their calibration services for these thermometers among the Calibration Measurement Capabilities of Appendix C of the BIPM Key Comparison Database. NIST and NRC arranged a bilateral comparison of a set of total-immersion ASTM-type liquid-in-glass thermometers to validate their uncertainty claims. Two each of ASTM thermometer types 62C through 69C were calibrated at NIST and at NRC at four temperatures distributed over the range appropriate to each thermometer, in addition to the ice point. Collectively, the thermometers span a temperature range of -38 °C to 305 °C. In total, 160 measurements (80 pairs) comprise the comparison data set. We have formed the pair-wise differences (TNIST - TNRC) for each thermometer at each temperature. For 5 of the 80 pairs (6%), the differences exceed the k=2 combined uncertainties. We consider the results evidence of a generally satisfactory state of affairs.
Citation
10th International Symposium on Temperature and Thermal Measurements in Industry and Science
Volume
30
Issue
1

Keywords

Calibration, Calibration and Measurement Capability, CMC, Comparison, Liquid-in-Glass thermometer, Supplemental comparison, Temperature.

Citation

Hill, K. , Gee, D. , Cross, C. and Strouse, G. (2009), NIST-NRC COMPARISON OF TOTAL IMMERSION LIQUID-IN-GLASS THERMOMETERS, 10th International Symposium on Temperature and Thermal Measurements in Industry and Science (Accessed June 18, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created January 31, 2009, Updated October 12, 2021