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Modernization of the International Temperature Scale ITS-90: triple point of carbon dioxide instead of triple point of mercury
https://doi.org/10.32446/0368-1025it.2022-7-54-57
Abstract
One of the directions for improving the ITS-90 is investigated – the search for a fixed temperature point, an alternative to the triple point of mercury, for example, the triple point of carbon dioxide. The need for this direction of improvement is due to the signing in 2013 under the auspices of the UN of the Minamata Convention on Mercury and the refusal to produce new measuring instruments based on mercury (liquid mercury thermometers, etc.). The design of the cell for the implementation of the triple point of carbon dioxide has been developed. Implementation methods and results of studies of the carbon dioxide triple point temperature reproducibility are presented. The research results show that it is promising to use the carbon dioxide triple point temperature as the ITS-90 reference point instead of the mercury triple point temperature, as well as the possibility of using it to calibrate both capsule and long-stem standard platinum resistance thermometers.
About the Authors
V. M. Okladnikov
Elemer
Russian Federation
Russian Federation
Vitaly M. Okladnikov
Moscow
S. P. Polunin
Elemer
Russian Federation
Russian Federation
Sergei P. Polunin
Moscow
N. A. Beketov
D. I. Mendeleyev Institute for Metrology (VNIIM)
Russian Federation
Russian Federation
Nikolay A. Beketov
St. Petersburg
A. I. Pokhodun
D. I. Mendeleyev Institute for Metrology (VNIIM)
Russian Federation
Russian Federation
Anatolii I. Pokhodun
St. Petersburg
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Review
For citations:
Okladnikov V.M., Polunin S.P., Beketov N.A., Pokhodun A.I. Modernization of the International Temperature Scale ITS-90: triple point of carbon dioxide instead of triple point of mercury. Izmeritel`naya Tekhnika. 2022;(7):54-57. (In Russ.) https://doi.org/10.32446/0368-1025it.2022-7-54-57
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