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Vol. 131, Issue 8, August 2011, pp.61-67

 

Bullet

 

Realization of Copper Melting Point for Thermocouple Calibrations

 

Y. A. ABDELAZIZ and F. M. MEGAHED

National Institute for Standards (NIS), Giza, Egypt

Tel.: ++202 010 5790 620, fax: ++202 33867451

E-mail: yasserabdelfatah@yahoo.com

 

 

Received: 17 July 2011   /Accepted: 22 August 2011   /Published: 30 August 2011

 

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Abstract: Although the temperature stability and uncertainty of the freezing plateau is better than that of the melting plateau in most of the thermometry fixed points, but realization of melting plateaus are easier than that of freezing plateaus for metal fixed points. It will be convenient if the melting points can be used instead of the freezing points in calibration of standard noble metal thermocouples because of easier realization and longer plateau duration of melting plateaus. In this work a comparison between the melting and freezing points of copper (Cu) was carried out using standard noble metal thermocouples. Platinum - platinum 10 % rhodium (type S), platinum 30 % rhodium / platinum 6 % rhodium (type B) and platinum - palladium (Pt/Pd) thermocouples are used in this study. Uncertainty budget analysis of the melting points and freezing points is presented. The experimental results show that it is possible to replace the freezing point with the melting point of copper cell in the calibration of standard noble metal thermocouples in secondary-level laboratories if the optimal methods of realization of melting points are used.

 

Keywords: Copper point, Freezing/melting plateau and Thermocouples

 

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