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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">izmertech</journal-id><journal-title-group><journal-title xml:lang="ru">Измерительная техника</journal-title><trans-title-group xml:lang="en"><trans-title>Izmeritel`naya Tekhnika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-1025</issn><issn pub-type="epub">2949-5237</issn><publisher><publisher-name>ФГУП "ВНИИФТРИ"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32446/0368-1025it.2024-3-26-30</article-id><article-id custom-type="elpub" pub-id-type="custom">izmertech-2119</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ТЕПЛОФИЗИЧЕСКИЕ ИЗМЕРЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>THERMOPHYSIC MEASUREMENTS</subject></subj-group></article-categories><title-group><article-title>Тройная точка диоксида углерода: применение в качестве новой градуировочной точки Международной температурной шкалы МТШ-90</article-title><trans-title-group xml:lang="en"><trans-title>Triple point of carbon dioxide: using a new calibration point of the International Temperature Scale ITS-90</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0006-2983-5142</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бекетов</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Beketov</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Николай Александрович Бекетов </p><p>Санкт-Петербург </p></bio><bio xml:lang="en"><p>Nikolai A. Beketov </p><p>St. Petersburg </p></bio><email xlink:type="simple">cjacksparrow@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Всероссийский научно-исследовательский институт метрологии им. Д. И. Менделеева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>D. I. Mendeleev Institute for Metrology</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>17</day><month>04</month><year>2024</year></pub-date><volume>0</volume><issue>3</issue><fpage>26</fpage><lpage>30</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Бекетов Н.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Бекетов Н.А.</copyright-holder><copyright-holder xml:lang="en">Beketov N.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.izmt.ru/jour/article/view/2119">https://www.izmt.ru/jour/article/view/2119</self-uri><abstract><p>Рассмотрена одна из важных задач совершенствования Международной температурной шкалы МТШ-90 – замена реперной точки ртути в связи с ратификацией Минаматской конвенции и ограничениями на добычу, применение и транспортировку ртути. Приведены результаты экспериментальной градуировки эталонных термометров сопротивления с применением новой градуировочной точки из списка вторичных реперных точек Международной температурной шкалы МТШ-90. Разработан метод реализации тройной точки диоксида углерода CO2 с использованием жидкого азота. Предложенный метод позволяет уменьшить время подготовки ампулы тройной точки CO2 с 60 до 30 мин при увеличении протяжённости плато плавления CO 2 с 10 до 40 ч. Представлены результаты градуировок термометров с применением тройных точек Hg и CO2. Описаны методы оценки градуировочных характеристик термометров на основе рассчитанных коэффициентов влияния. Проанализированы коэффициенты влияния для двух поддиапазонов градуировки термометров и показано, что неопределённость градуировки с использованием тройной точки CO2 уменьшается в два раза в диапазоне –189,3442…+0,0100 °С и в 1,5 раза в диапазоне –60…+60 °С. Результаты подтверждают возможность и перспективность применения тройной точки CO2 в качестве новой градуировочной точки взамен реперной точки Hg. Полученные данные актуальны для производителей эталонных платиновых термометров сопротивления и организаций, занимающихся поверками и калибровками таких термометров.</p></abstract><trans-abstract xml:lang="en"><p>One of the important tasks of improving the International Temperature Scale ITS-90 is considered – the substitution of the fixed point of mercury (Hg) in connection with the ratification of the Minamata Convention and restrictions on the extraction, use and transportation of mercury. Reported results of experimental calibration of long-stem standard platinum resistance thermometers using a new calibration point from the list of secondary fixed points of the International Temperature Scale ITS-90. A method has been developed to realize the triple point of carbon dioxide (CO2) using liquid nitrogen. The method reduced the preparation time of the cell from 60 to 30 minutes and increased the duration of melting plateau from 10 to 40 hours. Presented results of two calibrations cases: using the fixed-point of Hg; using the triple point of CO2 instead of fixed-point Hg. Described methods to evaluate propagation of calibration uncertainty based on the fixed-point sensitivity coefficients. The fixed-points sensitivity coefficients for two subranges of standard platinum resistance thermometers calibration are analyzed and it is shown that the calibration uncertainty using the triple point of CO2 is reduced by half in the range of –189.3442...+ 0.01 °C and by 1.5 times in the range of –60...+ 60 °C. The results confirm the possibility and prospects of using the CO2 triple point as a new calibration point to substitute the fixed-point Hg.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>температура</kwd><kwd>реперные точки МТШ-90</kwd><kwd>тройная точка ртути</kwd><kwd>тройная точка диоксида углерода</kwd><kwd>градуировка эталонных платиновых термометров</kwd></kwd-group><kwd-group xml:lang="en"><kwd>temperature</kwd><kwd>fixed-points of ITS-90</kwd><kwd>triple point of mercury</kwd><kwd>triple point of carbon dioxide</kwd><kwd>standard platinum resistance thermometers calibration</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">The International System of Units (SI). 9th edition. 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