Quantifying the calibration uncertainty attributable to thermocouple inhomogeneity

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DOIResolve DOI: http://doi.org/10.1063/1.4819595
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TypeArticle
Proceedings titleTemperature : Its Measurement and Control in Science and Industry
Series titleAIP Conference Proceedings; no. 1552
Conference9th International Temperature Symposium (ITS9), March 19–23 2012, Los Angeles, California, USA
ISSN0094-243X
ISBN978-0-7354-1178-4
Volume8
Pages520525; # of pages: 6
SubjectInhologeneity; Seebeck; thermocouple
AbstractInhomogeneity in the Seebeck coefficient as a function of position along a thermocouple wire frequently dominates the uncertainty budgets of thermocouple calibration and use. The calibration process itself, simply through exposure to elevated temperatures for relatively modest times, generates both reversible and irreversible changes to the thermocouple that are a complex function of time, temperature, alloy composition, sheath structure, etc. We present data acquired using a salt bath at 250 °C to provide the step-function-like gradient that is our spatial probe of thermoelectric homogeneity. We show how the finite width of the step-function limits our ability to assess the "true" inhomogeneity of the thermocouple, and explore how the inhomogeneity impacts the calibration uncertainty attainable with the various thermal sources used for the calibration of thermocouples (based on their characteristic temperature gradients).
Publication date
PublisherAIP Publishing
LanguageEnglish
AffiliationNational Research Council Canada; Measurement Science and Standards
Peer reviewedYes
NPARC number21270185
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Record identifier4d7fc383-8e4d-4296-9bf5-ce0a6ab27921
Record created2014-01-09
Record modified2016-05-09
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