One of the areas for improvement in ITS-90 is studied: the search for a fixed temperature point as an alternative to the triple point of mercury, e.g., the triple point of carbon dioxide. The need for this area of improvement arises from the signing in 2013 of the Minamata Convention on Mercury under the auspices of the UN and the avoidance of new measurement instrumentation based on mercury (liquid mercury thermometers, etc.). A cell for implementation of the triple point of carbon dioxide is designed. Methods for producing the triple point of carbon dioxide are introduced and the results of studies of its reproducibility are presented. These studies demonstrate that the use of the triple point of carbon dioxide offers promise as the fixed point for ITS-90 in place of the triple point of mercury, as well as the possibility of using it for calibration of both capsule and long-stem standard platinum resistance thermometers.
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References
Mise en pratique for the definition of the kelvin in the SI, Consultative Committee for Thermometry, SI Brochure, 9th ed. (2019), Appendix 2.
Consultative Committee for Photometry and Radiometry (CCPR), Report of the 24th meeting (September 19–20, 2019) to the International Bureau for Weights and Measures.
Minamata Convention on Mercury, Text and annexes, UNEP, UN (2017).
R. E. Bedfor, et al., Metrologia, No. 33, 133–154 (1996), https://doi.org/10.1088/00261394/33/2/3.
P. P. M. Steur and D. Giraudi, Int. J. Thermophys., 35, 604–610 (2014), https://doi.org/10.1007/s10765-014-1580-x.
P. P. M. Steur, P. M. C. Rourke, and D. Giraudi, Metrologia, 56, No. 1, 015008 (2019), https://doi.org/10.1088/1681-7575/AAEE3A.
W. L. Tew and K. N. Quelhas, J. Res. Natl. Inst. Stand. Technol., 123, 12013 (2018), https://doi.org/10.6028/jres.123.013.
Ting Li et al., Metrologia, 58, 035008 (2021), https://doi.org/10.1088/1681-7575/abee2c.
Yasuki Kawamura, Nobuhiro Matsumoto, and Tohru Nakan, Metrologia, 57, No. 1, 015004 (2020), https://doi.org/10.1088/1681-7575/ab451e.
G. T. Furukawa, B. W. Mangum, and G. F. Strouse, Metrologia, 34, No. 3, 215–233 (1997), https://doi.org/10.1088/0026-1394/34/3/3.
Guide to the Realization of the ITS-90. Fixed Points: Influence of Impurities, Consultative Committee for Thermometry under the auspices of the International Committee for Weights and Measures (201), p. 33.
Y. Liang, J. T. Zhang, and X. J. Feng, Int. J. Thermophys., 42, 142 (2021), https://doi.org/10.1007/s10765-021-02882-1.
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Translated from Izmeritel'naya Tekhnika, No. 7, pp. 54–57, July 2022.
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Okladnikov, V.M., Polunin, S.P., Beketov, N.A. et al. Modernization of the International Temperature Scale ITS-90: Triple Point of Carbon Dioxide Instead of Triple Point of Mercury. Meas Tech 65, 520–523 (2022). https://doi.org/10.1007/s11018-023-02113-z
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DOI: https://doi.org/10.1007/s11018-023-02113-z