Realization Triple Point of Carbon Dioxide at TÜBİTAK UME Laboratory

Authors : Yusuf Cenk İltuş, Murat Kalemci, Ali Uytun, Hasipcan Aydin, Lidya Susam

Pages : 1272-1278

Doi:10.35414/akufemubid.1535482

View : 111 | Download : 205

Publication Date : 2025-12-03

Article Type : Research Paper

Abstract :Temperature, a fundamental parameter in describing matter from the formation of the universe to the present day, has evolved with scientific advancements. Temperature measurement, crucial in everyday life, health, industry, and research, demands high precision. Innovations in temperature measurement technologies, particularly Standard Platinum Resistance Thermometers (SPRTs), have addressed this demand. The International Temperature Scale (ITS-90) defines fixed points, including the Triple Point of Water (TPW) and the Triple Point of Mercury (TP(Hg)). However, due to mercury\\\'s restrictions, alternative fixed points are sought. At the XX IMEKO World Congress on Temperature in 2012, Carbon Dioxide Triple Point (TP(CO2)) and Sulfur Hexafluoride (TP(SF6)) were proposed as alternatives. Recent studies have measured the triple point temperature of carbon dioxide to be around 216.591 K, with an uncertainty of less than 1 mK. This study focuses on the construction and metrological characterization of Carbon Dioxide Triple Point cells at TUBITAK UME. The measurements were conducted within the Primary Level Temperature Laboratory, performing two different methods for triple point realization. The study highlights the meticulous calibration processes and achieved precision, affirming the Carbon Dioxide Triple Point as a stable reference point. Comparisons with CCT\\\'s recommended values underline its accuracy and feasibility as an alternative to the Mercury Triple Point.
Keywords : Sıcaklık, Kalibrasyon, Sabit Nokta, Termodinamik, Metroloji

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