Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Calibration by Comparison and Uncertainty Assessment of Industrial Thermometers at the Boiling Point of Nitrogen

질소의 끓는점에서의 산업용 온도계 비교 교정과 불확도 평가

  • Yang, Inseok (Center for Thermometry, Div. of Physical Metrology, Korea Research Institute of Standards and Science) ;
  • Gam, Kee Sool (Center for Thermometry, Div. of Physical Metrology, Korea Research Institute of Standards and Science) ;
  • Joung, Wukchul (Center for Thermometry, Div. of Physical Metrology, Korea Research Institute of Standards and Science) ;
  • Kim, Yong-Gyoo (Center for Thermometry, Div. of Physical Metrology, Korea Research Institute of Standards and Science)
  • 양인석 (한국표준과학연구원 기반표준본부 온도센터) ;
  • 감기술 (한국표준과학연구원 기반표준본부 온도센터) ;
  • 정욱철 (한국표준과학연구원 기반표준본부 온도센터) ;
  • 김용규 (한국표준과학연구원 기반표준본부 온도센터)
  • Received : 2013.07.08
  • Accepted : 2013.06.30
  • Published : 2013.11.29
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Abstract

We devised calibration procedure for industrial thermometers by a comparison method at the boiling point of nitrogen (${\sim}-196^{\circ}C$). The uncertainty of the calibration was 4 mK (k = 2). As experimentally demonstrated in this work, the effect of the atmospheric pressure on the boiling point of nitrogen can be easily detected by the thermometer. Therefore, when the boiling point of nitrogen is used for calibration of thermometer by comparison, either a reference thermometer must be used to provide the reference temperature or the effect of atmospheric pressure should be carefully considered. The use of a copper block with a large thermal mass soaked into the liquid nitrogen was proven to be more reliable, and the stability of the temperature immersed into the copper block was 1.4 mK. The temperatures at the thermometer wells, evaluated by the crossed-measurement method to compensate for the inaccuracy of the thermometers and the linear drift of the temperature of the copper block, were equivalent within 0.23 mK of standard uncertainty.

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References

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