A STUDY OF INHOMOGENEITIES OF THERMOCOUPLES AND ITS CONTRIBUTION TO THE CALIBRATION UNCERTAINTY CALCULUS

M. A. P. Castanho, C. R. Baldo

Abstract

This paper presents a study on the measurement of thermocouple inhomogeneity and its contribution to the calculation of the uncertainty of thermocouple calibration. This study evaluated 26 thermocouples, including noble metal thermocouples (type S, R and B) and base metal thermocouples (type N, K, T and J). The measurements were carried out in alcohol, oil and salt baths, at temperatures from -40 ° C to 420 ° C. In this paper we propose a correlation of inhomogeneity value for each thermocouple type evaluated, considering the temperature range and immersion depth.

Keywords

thermocouple, inhomogeneities, calibration, uncertainty

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IMEKO-WC-2012-TC12-O3.pdf

DOI

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IMEKO TC

TC12 - Temperature and Thermal Measurements

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