COMPARISON BETWEEN SIMPLE POLYNOMIALS AND AN ITS-90 BASED REFERENCE FUNCTIONS OF EMF VS. TEMPERATURE RELATION FOR HIGH PURITY NOBLE METAL THERMOCOUPLES
Journal Title: Metrology and Measurement Systems - Year 2005, Vol 12, Issue 2
Abstract
Emf versus temperature reference polynomial functions covering the temperature range from 100° C up to 960° C have been developed for three types of noble metal thermocouples, which are Pt-10%Rh/Pt, Au/Pt and Pt/Pd. Our functions are compared to the reference functions available in the literature. The thermocouples were fabricated and annealed for stabilization at 962° C for 300 hours before calibrations. After stabilization they were calibrated by comparison with Standard Platinum Resistance Thermometer (SPRT) in the temperature range from 100° C to 450° C and by comparison with a High temperature Standard Platinum Resistance Thermometer (HSPRT) in the temperature range from 450° C up to 950° C. The error of fit was evaluated and discussed.
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FATEN MEGAHED
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