Co–C and Pd–C Eutectic Fixed Points for Radiation Thermometry and Thermocouple Thermometry

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  1. TEMPMEKO 2016: Selected Papers of the 13th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science


Two Co–C and Pd–C eutectic fixed point cells for both radiation thermometry and thermocouple thermometry were constructed at NMC. This paper describes details of the cell design, materials used, and fabrication of the cells. The melting curves of the Co–C and Pd–C cells were measured with a reference radiation thermometer realized in both a single-zone furnace and a three-zone furnace in order to investigate furnace effect. The transition temperatures in terms of ITS-90 were determined to be \(1324.18\,{^{\circ }}\hbox {C}\) and \(1491.61\,{^{\circ }}\hbox {C}\) with the corresponding combined standard uncertainty of \(0.44\,{^{\circ }}\hbox {C}\) and \(0.31\,{^{\circ }}\hbox {C}\) for Co–C and Pd–C, respectively, taking into account of the differences of two different types of furnaces used. The determined ITS-90 temperatures are also compared with that of INRIM cells obtained using the same reference radiation thermometer and the same furnaces with the same settings during a previous bilateral comparison exercise (Battuello et al. in Int J Thermophys 35:535–546, 2014). The agreements are within \(k=1\) uncertainty for Co–C cell and \(k = 2\) uncertainty for Pd–C cell. Shapes of the plateaus of NMC cells and INRIM cells are compared too and furnace effects are analyzed as well. The melting curves of the Co–C and Pd–C cells realized in the single-zone furnace are also measured by a Pt/Pd thermocouple, and the preliminary results are presented as well.


Eutectic fixed point Point of inflection (POI ) Radiation thermometry Thermocouple thermometry Transition temperature 



The author wishes to thank Y. Yamada, Dr H. Ogura, and Dr F. Girard for their insightful discussions and suggestions offered in the process of this study. Thanks also go to S.H. Ang for his help in literature survey and drawing of the cells and Goh Choon Heng for his assistance in furnace operations and measurements.


  1. 1.
    Y. Yamada et al., Radiometric observation of melting and freezing plateaus for a series of metal–carbon eutectic points in the range \(1330\,^{\circ }\text{ C }\) to \(1950\,^{\circ }\text{ C }\). Metrologia 36, 207 (1999)ADSCrossRefGoogle Scholar
  2. 2.
    Y. Yamada et al., High-temperature fixed points in the range \(1150\,^{\circ }\text{ C }\) to \(2500\,^{\circ }\text{ C }\) using metal–carbon eutectics. Metrologia 38, 213 (2001)ADSCrossRefGoogle Scholar
  3. 3.
    G. Machin et al., A concerted international project to establish high-temperature fixed points for primary thermometry. Int. J. Thermophys. 28, 1976–1982 (2007)ADSCrossRefGoogle Scholar
  4. 4.
    M. Battuello, F. Girard, M. Florio, Metal–carbon eutectics to extend the use of the fixed-point technique in precision IR thermometry. Int. J. Thermophys. 29, 926–934 (2008)ADSCrossRefGoogle Scholar
  5. 5.
    P. Bloembergen, Y. Yamada, Measurement of thermodynamic temperature above the silver point on the basis of the scheme \(n = 2\). Int. J. Thermophys. 32, 45–67 (2011)ADSCrossRefGoogle Scholar
  6. 6.
    F. Edler, A.C. Baratto, A cobalt–carbon eutectic fixed point for the calibration of contact thermometers at temperatures above \(1100\,^{\circ }\text{ C }\). Metrologia 42, 201–207 (2005)ADSCrossRefGoogle Scholar
  7. 7.
    H. Ogura, M. Izuchi, M. Arai, Evaluation of cobalt–carbon and palladium–carbon eutectic point cells for thermocouple calibration. Int. J. Thermophys. 29, 210–221 (2008)ADSCrossRefGoogle Scholar
  8. 8.
    J.V. Pearce et al., Evaluation of the Pd–C eutectic fixed point and the Pt/Pd thermocouple. Metrologia 46, 473–479 (2009)ADSCrossRefGoogle Scholar
  9. 9.
    A.D.W. Todd et al., Cobalt–carbon eutectic fixed point for contact thermometry. Int. J. Thermophys. 32, 453–462 (2011)ADSCrossRefGoogle Scholar
  10. 10.
    R.N. Teixeira, A.C. Baratto, A Nickel–carbon eutectic cell for contact and non-contact thermometry. Int. J. Thermophys. 28, 1993–2001 (2007)ADSCrossRefGoogle Scholar
  11. 11.
    F. Edler, J. Hartmann, Simultaneous contact and non-contact measurements of the melting temperature of a Ni–C fixed-point cell. Int. J. Thermophys. 28, 2002–2008 (2007)ADSCrossRefGoogle Scholar
  12. 12.
    J. Bojkovski et al., Design, construction, and evaluation of Ni–C eutectic fixed points. Int. J. Thermophys. 32, 1800–1810 (2011)ADSCrossRefGoogle Scholar
  13. 13.
    M. Battuello, L. Wang, F. Girard, S.H. Ang, Co–C and Pd–C fixed points for the evaluation of facilities and scales realisation at INRIM and NMC, international symposium on temperature and thermal measurement in industry and science—TEMPMEKO 2013, Madeira, Portugal, 14–17 Oct 2013. Int. J. Thermophys. 35, 535–546 (2014)ADSCrossRefGoogle Scholar
  14. 14.
    M. Battuello, F. Girard, L. Wang, INRIM-NMC comparison of Pt/Pd calibration above the Ag point, joint international symposium on temperature, humidity, moisture and thermal measurements in industry and science—TEMPMEKO & ISHM 2010, Portorož, Slovenia, May 31–June 3, 2010. Int. J. Thermophys. 31, 1444–1455 (2010)ADSCrossRefGoogle Scholar
  15. 15.
    Y. Yamada, Protocol CCT-WG 5 HTFP Research Plan, Workpackage 2: Construction of HTFP cells for definitive thermodynamic temperature measurements, Version 3.1 (2010)Google Scholar
  16. 16.
    M. Sadli, et al., Review of metal–carbon eutectic temperatures: proposal for new ITS-90 secondary points. in Proceedings of the TEMPMEKO’04, 9th international symposium on temperature and thermal measurement in industry and science (2005), pp. 341–347Google Scholar
  17. 17.
    E.R. Woolliams et al., Thermodynamic temperature assignment to the point of inflection of the melting curve of high-temperature fixed points. Phil. Trans. R. Soc. A 374, 20150044 (2016). ADSCrossRefGoogle Scholar
  18. 18.
    K. Anhalt et al., Thermodynamic temperature determinations of Co–C, Pd–C, Pt–C and Ru–C eutectic fixed-point cells. Metrologia 43, S78 (2006)CrossRefGoogle Scholar

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© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.National Metrology Centre (NMC), Agency for Science, Technology and Research (A*STAR)SingaporeSingapore

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