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1887
Volume 60, Issue 4
  • ISSN: 2056-5135

Abstract

Barring the presence of significant amounts of impurities, an important cause of thermoelectric inhomogeneity and therefore calibration drift of platinum-rhodium thermocouples at high temperatures is the vaporisation and transport of the oxides of Pt and Rh, which causes local changes in wire composition. By examining the vapour pressures of Pt and Rh oxides and their temperature dependence, it is shown that at a given temperature there is an optimal wire composition at which evaporation of the oxides has no effect on the wire composition, provided the vapour does not leave the vicinity of the wire. This may also have applications for Pt-Rh heater elements.

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2016-01-01
2024-02-24
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References

  1. Quinn T. J. ‘Thermocouples’, in “Temperature”, Academic Press, London, UK, 1983 [Google Scholar]
  2. Barnard R. D. “Thermoelectricity in Metals and Alloys”, Taylor & Francis Group, London, UK, 1972 [Google Scholar]
  3. Blatt F. J., Schroeder P. A., Foiles C. L., and Greig D. “Thermoelectric Power of Metals”, Plenum Press, New York, USA, 1976 LINK http://dx.doi.org/10.1007/978-1-4613-4268-7 [Google Scholar]
  4. Pollock D. D. “Thermoelectricity: Theory, Thermometry, Tool”, ASTM Special Technical Publication 852, American Society for Testing and Materials, Philadelphia, Pennsylvania, USA, 1985 [Google Scholar]
  5. Darling A. S., and Selman G. L. “Some Effects of Environment on the Performance of Noble Metal Thermocouples”, Vol. 4, Part 3, TMCSI, 1972, pp. 16331644 [Google Scholar]
  6. Selman G. L. “On the Stability of Metal Sheathed Noble Metal Thermocouples”, Vol. 4, Part 3, Section 8C, STSI, 1972, pp. 18831840 [Google Scholar]
  7. Rogel’berg I. L., and Beilin V. M. “Alloys for Thermocouples: Handbook”, Metallurgiya, Moscow, Russia, 1983 [Google Scholar]
  8. Alcock C. B., and Hooper G. W. Proc. Roy. Soc. A, 1960, 254, (1279), 551 LINK http://dx.doi.org/10.1098/rspa.1960.0040 [Google Scholar]
  9. Edler F., and Ederer P. AIP Conf. Proc., 2013, 1552, 532 LINK http://dx.doi.org/10.1063/1.4819597 [Google Scholar]
  10. Chaston J. C. Platinum Metals Rev., 1975, 19, (4), 135 LINK http://www.technology.matthey.com/article/19/4/135-140/# [Google Scholar]
  11. Sojka J., Vodárek V., Sobotka J., and Dubský M. J. Less Common Metals, 1991, 171, (1), 41 LINK http://dx.doi.org/10.1016/0022-5088(91)90261-2 [Google Scholar]
  12. Rubel M., Pszonicka M., Ebel M. F., Jabłoński A., and Palczewska W. J. Less Common Metals, 1986, 125, 7 LINK http://dx.doi.org/10.1016/0022-5088(86)90076-7 [Google Scholar]
  13. Jehn H. J. Less Common Metals, 1984, 100, 321 LINK http://dx.doi.org/10.1016/0022-5088(84)90072-9 [Google Scholar]
  14. Krier C. A., and Jaffee R. I. J. Less Common Metals, 1963, 5, (5), 411 LINK http://dx.doi.org/10.1016/0022-5088(63)90055-9 [Google Scholar]
  15. British Standards Institution, Thermocouples – Part 1: E.M.F. Specifications and Tolerances, BS EN 60584-1: 2013, BSI, London, UK [Google Scholar]
  16. Burns G. W., and Gallagher J. S. J. Res. Nat. Bur. Stds., 1966, 70C, (2), 89 LINK http://dx.doi.org/10.6028/jres.070c.010 [Google Scholar]
  17. Bedford R. E. Rev. Sci. Instrum., 1965, 36, (11), 1571 LINK http://dx.doi.org/10.1063/1.1719395 [Google Scholar]
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