Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Evaluation of Uncertainty Sources in Temperature Measurement Using Platinum Resistance Thermometer Caused by Temperature Gradient in Furnace and Sealed-type Freezing Point Cells

전기로 및 봉입형 응고점 셀 내의 온도구배가 미치는 표준백금저항온도계 온도측정의 불확도 요소 평가

  • 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)
  • 강기훈 (한국표준과학연구원 물리표준부) ;
  • 감기술 (한국표준과학연구원 물리표준부) ;
  • 김용규 (한국표준과학연구원 물리표준부) ;
  • 송창호 (한국표준과학연구원 물리표준부)
  • Published : 2004.11.30
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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.

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References

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