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incertainty

International Journal of Metrology and Quality Engineering (1)

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Uncertainty evaluation in the calibration of Pt/Pd thermocouples up to copper freezing point at NIS-Egypt
F.M. Megahed, Y.A. Abdelaziz
Journal:

International Journal of Metrology and Quality Engineering / Volume 2 / Issue 1 / 2011

Published online by Cambridge University Press:

29 June 2011, pp. 13-17

Print publication:

2011
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The dissemination of traceability to the International Temperature Scale of 1990 (ITS-90) through comparison calibration of thermocouples, is playing an important role in metrology institutes, secondary laboratories and industrial measurements. The previous studies of the Pt/Pd thermocouples at NIS-Egypt, shows promise of achieving significant improvements uncertainty of temperature measurements up to 960 °C. In this paper we describe the uncertainty assessment on the measurements of the calibration of Pt/Pd thermocouples at fixed point cells up to the freezing point of copper and by the comparison technique following a defined heat treatment at 1100 °C. All the measurements on Pt/Pd thermocouples were carried out using NIS facilities.