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

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

Abstract

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.

Keywords

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

Notes

Acknowledgements

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.

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Copyright information

© 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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