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Development and Long-Term Stability Assessment of Co–C Eutectic Fixed Point for Thermocouple Thermometry

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Abstract

The long-term stability assessment on the Co–C eutectic fixed point cell indigenously developed at CSIR-National Physical Laboratory, India is presented. Metal–carbon eutectic fixed points are promising candidates for the direct traceability to high-temperature thermometry and radiometry. The acceptance of any fixed point as a temperature reference cell depends on its repeatability, reproducibility, and long-term stability. In this paper, we report the detailed investigations on development and realization of Co–C cell and comparison of successive 3-year data to evaluate the long-term stability and robustness of cell. We assigned melting transition temperature to Co–C cell by using Type-S thermocouple, calibrated on ITS-90 fixed points. The cell has been subjected for 270 h of melt–freeze cycle since its construction in 2014 and exhibits excellent thermo-mechanical stability. The Co–C melting transition temperature and measurement uncertainty were estimated by using the same Type-S thermocouple, for 3 years from 2015 to 2017, and overall drift for the cell was estimated to be 0.1 °C, after normalizing the drift of the thermocouple.

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Acknowledgments

We are thankful to Dr. D. K. Aswal, Director, CSIR-NPL and Dr. Ranjana Mehrotra, Head, Physico-Mechanical Metrology Division for their constant support in this project. The financial support received from CSIR Project, “Measurement Innovations in Science and Technology (MIST-PSC-0111)” is acknowledged. Umesh Pant acknowledges the AcSIR and CSIR for the award of Senior Research Fellowship. We acknowledge our colleagues Dr. Komal Bapna, Yetendra, and Mahesh Gandhi from Temperature and Humidity Metrology for their technical help during this work.

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Authors and Affiliations

  1. CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110012, India

    Umesh Pant, Hansraj Meena, Gaurav Gupta & D. D. Shivagan

  2. Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr. K. S Krishnan Marg, New Delhi, 110012, India

    Umesh Pant & D. D. Shivagan

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  1. Umesh Pant
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Pant, U., Meena, H., Gupta, G. et al. Development and Long-Term Stability Assessment of Co–C Eutectic Fixed Point for Thermocouple Thermometry. Int J Thermophys 40, 80 (2019). https://doi.org/10.1007/s10765-019-2546-9

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