Platinum Versus Palladium Thermocouples: an EMF-Temperature Reference Function for the Range 0 degrees {Celsius} to 1500 degrees {Celsius}

Published

October 1, 1998

Author(s)

G W. Burns, Dean C. Ripple, M Battuello

Abstract

We present an emf-temperature reference function for platinum versus palladium (Pt/Pd) thermocouples in air for the range 0 degrees {Celsius} to 1500 degrees {Celsius}. The reference function is based on the International Temperature Scale of 1990 (ITS-90) and has an expanded uncertainty (coverage factor of two) of less than the equivalent of 11 mK for temperatures up to 1050 degrees {Celsius} and rising smoothly to about 0.3 K at 1500 degrees {Celsius}. The reference function is based on a set of Pt/Pd thermocouples of exceptional stability and homogeneity constructed from Pt and Pd wire of very high purity (99.999% mass fraction and 99.997% mass fraction respectively). Experimental results are presented on the thermoelectric stability of Pt/Pd thermocouples at high temperatures and on the calibration of Pt/Pd thermocouples based on this reference function.

Citation

Metrologia

Volume

35

Issue

5

Pub Type

Journals

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Keywords

high temperature, palladium, platinum, reference function, thermocouple

Citation

Burns, G. , Ripple, D. and Battuello, M. (1998), Platinum Versus Palladium Thermocouples: an EMF-Temperature Reference Function for the Range 0 degrees {Celsius} to 1500 degrees {Celsius}, Metrologia, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=830597 (Accessed April 19, 2024)