Int. J. Metrol. Qual. Eng.
Volume 2, Number 1, 2011
|Page(s)||13 - 17|
|Published online||29 June 2011|
Uncertainty evaluation in the calibration of Pt/Pd thermocouples up to copper freezing point at NIS-Egypt
National Institute for Standards NIS, Thermal Measurements Lab, Tersa St. Elharam, El-Giza, P.O. 136 Giza, 12211 Egypt
⋆ Correspondence: email@example.com
Received: 4 February 2011
Accepted: 21 February 2011
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.
Key words: Copper freezing point / Pt/Pd thermocouples / incertainty
© EDP Sciences 2011
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