Limitations of thermocouples in temperature measurements

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Factors limiting the accuracy of temperature measurements with type K and type S sheathed thermocouple assemblies are discussed. The effect of short-range ordering in Chromel is shown to limit the accuracy of temperature measurements made with type K thermocouple to about 1%. Errors of as much as 150% have been observed in type K thermocouples in magnetic fields at temperatures below the Curie temperature of Alumel. Both positive and negative errors were observed when the orientations of the applied magnetic field, the temperature gradient and the axis of the Alumel wire were such as to produce an emf along the … continued below

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33 pages

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Anderson, R. L.; Adams, R. K. & Duggins, B. C. January 1, 1979.

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Description

Factors limiting the accuracy of temperature measurements with type K and type S sheathed thermocouple assemblies are discussed. The effect of short-range ordering in Chromel is shown to limit the accuracy of temperature measurements made with type K thermocouple to about 1%. Errors of as much as 150% have been observed in type K thermocouples in magnetic fields at temperatures below the Curie temperature of Alumel. Both positive and negative errors were observed when the orientations of the applied magnetic field, the temperature gradient and the axis of the Alumel wire were such as to produce an emf along the thermocouple wire due to the Nernst--Ettingshausen effect.

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33 pages

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Dep. NTIS, PC A03/MF A01.

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  • 25. ISA international instrumentation symposium, Anaheim, CA, USA, 7 May 1979

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  • Report No.: CONF-790505-14
  • Grant Number: W-7405-ENG-26
  • Office of Scientific & Technical Information Report Number: 6385590
  • Archival Resource Key: ark:/67531/metadc1211016

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1979

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Aug. 23, 2021, 3:57 p.m.

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Anderson, R. L.; Adams, R. K. & Duggins, B. C. Limitations of thermocouples in temperature measurements, article, January 1, 1979; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1211016/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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