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Vol. 111, Issue 12, December 2009, pp. 65-70




Study of the Stability of Copper Fixed Point in Sealed Cells for Calibration of Noble Metal Thermocouples


Yasser A. Abdel-Aziz and Faten M. Megahed

National Institute for Standards (NIS), Giza, Egypt

Tel.: +20105790620, fax: +233867451

E-mail: yasserabdelfatah@yahoo.com



Received: 16 November 2009   /Accepted:  22 December 2009   /Published:  30 December 2009


Abstract: This paper reports the realization and stability of the freezing point of high purity copper (99.9999%) Cu (1084.62 C) in a sealed cell by noble metal thermocouples of Pt-l0%Rh/Pt (type S) and Pt-30%Rh/Pt-6%Rh (type B), using a three zone heating furnace. The graphite crucible in the sealed cell is made of ultra high purity carbon to contain 99.9999 % purity Cu metal. The individual difference at Cu freezing point, measured by each thermocouple at the National Institute for Standards (NIS) with respect to the value as stated in the ITS-90, is lying within the overall uncertainty of measurements. The expanded uncertainty of measurements was evaluated and expressed as 95% confidence level. The Cu freezing point as measured with type-S thermocouple was found to be 1084.62 C 0.666 C and that with type B thermocouple was found to be 1084.62 C 0.532 C.


Keywords: Thermocouples calibration, Freezing point stability, Copper cell


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