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Self-validating type C thermocouples to 2300 °C using high temperature fixed points.

Pearce, J V; Elliott, C J; Machin, G; Ongrai, O (2013) Self-validating type C thermocouples to 2300 °C using high temperature fixed points. AIP Conf. Proc., 1552. pp. 595-600.

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Abstract

Above 1500 °C, tungsten-rhenium (W-Re) thermocouples are the most commonly used contact thermometers because they are practical and inexpensive. However in general decalibration is very rapid, and, due to their embrittlement at high temperature, it is generally not possible to remove them for recalibration from the process environments in which they are used. Even if removal for recalibration was possible this would be of, at best, very limited use due to large inhomogeneity effects. Ideally, these thermocouples require some mechanism to monitor their drift in-situ. In this study, we describe self-validation of Type C (W5%Re/W26%Re) thermocouples by means of miniature high temperature fixed points (HTFP) comprising crucibles containing Co-C, Pt-C, Ru-C, and Ir-C eutectic alloys. An overview of developments in this area is presented.

Item Type: Article
Keywords: Thermocouple, self-validation, self-calibration, metal-carbon eutectic, fixed point, HTFP
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1063/1.4821396
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5949

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