NDLI: Melting Temperature of High-Temperature Fixed Points for Thermocouple Calibrations

Content Provider	Springer Nature Link
Author	Pearce, J. V. Montag, V. Lowe, D. Dong, W.
Copyright Year	2010
Abstract	Thermocouples can be calibrated at pure metal ingot-based fixed points at temperatures up to the freezing point of copper (1084.62 °C). For Pt/Pd thermocouples, the deviation from the accepted reference function very often takes an approximately linear form up to the copper fixed point. The calibration of Pt/Pd thermocouples may therefore be more amenable to extrapolation than that of Pt/Pt-Rh thermocouples. Here, the melting temperatures of a Co–C and a Pd–C eutectic fixed point are determined by extrapolating the deviation functions of several Pt/Pd thermocouples, after the fashion of Edler et al. The results are compared with the melting temperatures measured using non-contact radiation thermometry. The expanded uncertainty (k = 2) of the melting temperatures determined by extrapolation of the Pt/Pd thermocouple calibrations is ±0.32 °C for the Co–C fixed point, and ±0.49 °C for the Pd–C fixed point. For both fixed points, these uncertainties are comparable to those of non-contact radiation thermometry measurements. While a number of assumptions are made in performing the extrapolation of the calibrations, the method does appear to offer a useful complement to non-contact radiation thermometry measurements.
Starting Page	463
Ending Page	470
Page Count	8
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	32
Issue Number	1-2
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2010-12-03
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Eutectic fixed points Fixed points Radiation thermometry Thermocouples Physical Chemistry Industrial Chemistry/Chemical Engineering Mechanics Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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