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http://dx.doi.org/10.5369/JSST.2004.13.6.411

Evaluation of Uncertainty Sources in Temperature Measurement Using Platinum Resistance Thermometer Caused by Temperature Gradient in Furnace and Sealed-type Freezing Point Cells  

Kang, Kee-Hoon (Korea Research Institute of Standards and Science, Division of Physical Metrology)
Gam, Kee-Sool (Korea Research Institute of Standards and Science, Division of Physical Metrology)
Kim, Yong-Gyoo (Korea Research Institute of Standards and Science, Division of Physical Metrology)
Song, Chang-Ho (Korea Research Institute of Standards and Science, Division of Physical Metrology)
Publication Information
Journal of Sensor Science and Technology / v.13, no.6, 2004 , pp. 411-416 More about this Journal
Abstract
In the international temperature scale of 1990 (ITS-90), standard platinum resistance thermometer (SPRT) is a defining standard thermometer used in the temperature range from 13.8033 K to $961^{\circ}C$. Uncertainty of SPRT is about several mK and uncertainty of defining fixed points of the ITS-90 which is used for calibrating SPRT is about several tenth of mK. Above $0^{\circ}C$. the defining fixed points are gallium melting point and indium, tin, zinc, aluminium and silver freezing points which are all realized using an electric furnace or a liquid bath. To realize freezing point of tin ($231.928^{\circ}C$) and zinc ($419.527^{\cir}C$), two 3-zone furnaces which have 3 electric heaters were manufactured. Temperature gradient of the constructed furnaces were tested. Uncertainty caused by temperature gradient of furnace and immersion effect of SPRT in the sealed-type freezing point cells were evaluated 0.038 mK for tin freezing point and 0.036 mK for zinc freezing point.
Keywords
temperature; freezing point; standard platinum resistance thermometer; uncertainty;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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