Kalemci, M. | Arifovic, N. | Bağçe, A. | Aytekin, S.O. | Ince, A.T.

Article | 2015 | International Journal of Thermophysics36 ( 8 ) , pp.1968 - 1979

TUBITAK UME Temperature Laboratory initiated a new study which focuses on the construction of a tin freezing-point cell as a primary temperature standard. The design is an open-cell type similar to the National Institute of Standards and Technology design. With this aim, a brand new vacuum and filling line employing an oil diffusion pump and two cold traps (liquid nitrogen and dry ice) was set-up. The graphite parts (crucible, thermometer well, etc.) have been baked at high temperature under vacuum. Each cell was filled with approximately 1 kg of high-purity tin (99.9999 %) in a three-zone furnace. Then several melting and freezing . . .curves were obtained to assess the quality of the home-made cell, and also the new cell was compared with the existing reference cell of the laboratory. The results obtained are very close to the reference cell of UME, indicating that the method used for fabrication was promising and satisfactory and also seems to meet the requirements to have a primary level temperature standard. © 2015, Springer Science+Business Media New York Daha fazlası Daha az

Kalemci, M. | Bağçe, A. | Ince, A.T. | Arifoviç, N.

Article | 2018 | International Journal of Thermophysics39 ( 9 ) , pp.1968 - 1979

The Temperature Laboratory at TUBITAK UME initiated a study which focused on the construction of freezing point cells of ITS-90 as primary temperature standards. The first cell constructed within the scope of this study was an open tin freezing point cell and the results were in good agreement with the reference tin fixed point cell of UME. The second set of cells constructed was two open zinc freezing point cells. The design of these cells is similar to the tin freezing point cell. After construction, all the home-made cells were evaluated by analyzing their melting and freezing curves. Finally comparison measurements were performe . . .d between the current laboratory reference zinc cell and all newly constructed cells. © 2018, Springer Science+Business Media, LLC, part of Springer Nature Daha fazlası Daha az