The eutectic Co-C melting point is a promising system to serve as a thermometric fixed-point in the temperature range above 1084.62 °C (copper freezing point). During the last decade, LNE-Cnam has developed and characterized some fixed-point devices, based on eutectic Co-C alloy, for applications to contact and radiation thermometry. Above 962 °C, the ITS-90 is realized by radiation thermometry by the extrapolation from a Ag, Au or Cu fixed point using the Planck law for radiation. So the only way for assigning a temperature in the scale to a Co-C cell (∼1324 °C) is by radiation thermometry. An indirect method is commonly used to assign a temperature to a high-temperature fixed point (HTFP) cell designed for contact thermometry is to fill a pyrometric cell with the same mixture as the contact thermometry cell. In this case, the temperature assigned to the pyrometric cell is attributed to the contact cell. This paper describes a direct method allowing the determination of the melting temperature realized by a "contact thermometry" Co-C cell by comparison to a "radiation thermometry" Co-C cell whose melting temperature was assigned in accordance to the scale by extrapolation from the Cu point. In addition, the same Co-C cell is studied with a standard Pt/Pd thermocouple.
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11 September 2013
TEMPERATURE: ITS MEASUREMENT AND CONTROL IN SCIENCE AND INDUSTRY, VOLUME 8: Proceedings of the Ninth International Temperature Symposium
19–23 March 2012
Los Angeles, California, USA
Research Article|
September 11 2013
A new technique for direct traceability of contact thermometry Co-C eutectic cells to the ITS-90
G. Failleau;
G. Failleau
Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy 93210 La Plaine Saint Denis,
France
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T. Deuzé;
T. Deuzé
Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy 93210 La Plaine Saint Denis,
France
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F. Bourson;
F. Bourson
Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy 93210 La Plaine Saint Denis,
France
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S. Briaudeau;
S. Briaudeau
Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy 93210 La Plaine Saint Denis,
France
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M. Sadli
M. Sadli
Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy 93210 La Plaine Saint Denis,
France
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G. Failleau
T. Deuzé
F. Bourson
S. Briaudeau
M. Sadli
Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy 93210 La Plaine Saint Denis,
France
AIP Conf. Proc. 1552, 352–357 (2013)
Citation
G. Failleau, T. Deuzé, F. Bourson, S. Briaudeau, M. Sadli; A new technique for direct traceability of contact thermometry Co-C eutectic cells to the ITS-90. AIP Conf. Proc. 11 September 2013; 1552 (1): 352–357. https://doi.org/10.1063/1.4819565
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