Ripple, D.
and Burns, G.
(2002),
Standard Reference Material 1749: Au/Pt Thermocouple Thermometer, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD
(Accessed March 22, 2025)
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Standard Reference Material 1749: Au/Pt Thermocouple Thermometer
Published
Author(s)
,
Abstract
Standard Reference Material (SRM) 1749 is a lot of 18 specially-constructed gold versus platinum (Au/Pt) thermocouple thermometers, each calibrated on the International Temperature Scale of 1990 (ITS-90) and supplied with integral lead wires and a protective sheath. It is the most accurate thermocouple available over the range 0 C to 1000 C, with an expanded uncertainty (k=2) less than 8.3m C from 0 C to 962 C, and rising to 14 m C at 1000 C. We describe the fabrication and calibration methods used to prepare the SRM 1749 thermocouples. These thermocouples are exceptionally thermoelectrically homogeneous and stable over hundreds of hours of use, making them an excellent choice as a secondary reference thermometer. To facilitate low measurement uncertainties in applications, practical methods for emf measurements and comparison calibrations of other thermometers with the SRM 1749 thermocouple are also given.Citation
Special Publication (NIST SP) - 260-134
Report Number
260-134
NIST Pub Series
Pub Type
NIST Pubs
Keywords
gold, platinum, thermocouple, thermometer
Citation
Issues
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Created March 1, 2002, Updated October 16, 2008