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http://dx.doi.org/10.5369/JSST.2013.22.6.404

Calibration by Comparison and Uncertainty Assessment of Industrial Thermometers at the Boiling Point of Nitrogen  

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)
Publication Information
Journal of Sensor Science and Technology / v.22, no.6, 2013 , pp. 404-409 More about this Journal
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.
Keywords
Calibration by comparison; Industrial thermometer; Liquid nitrogen; Uncertainty;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 H. Preston-Thomas, "The international temperature scale of 1990 (ITS-90)", Metrologia, Vol. 27, No. 1, pp. 3-10, 1990.   DOI   ScienceOn
2 I. Yang, C. H. Song, K. H. Kang, and Y. - G. Kim, "Development of the calibration system for very accurate thermometers at low temperatures", J. Sensor Sci. & Tech., Vol. 17, No. 3, pp. 188-194, 2008.   DOI   ScienceOn
3 I. Yang, C. H. Song, K. H. Kang, and Y. - G. Kim, "Development of the automatic calibration system for industrial resistance thermometers at low temperatures", J. Sensor Sci. & Tech., Vol. 17, No. 6, pp. 429-436, 2008.   DOI   ScienceOn
4 T. Nakano, O. Tamura, and H. Sakurai, "Comparison system for the calibration of capsule-type standard platinum resistance thermometers at NMIJ/AIST", Int. J. Thermophys. Vol. 29, No. 3, pp. 881-889, 2008.   DOI
5 G. M. Chen, X. Gao, S. Z. Zhang, Q. Chen, L. M. Tang, and Y. Q. Lan, "Development of an automatic calibration device for high-accuracy low temperature thermometers", Science China Technological Sciences, Vol. 53, No. 9, pp 2404-2407, 2010.   DOI
6 M. Ballico and C. Freund, "A cryostat for automated mK-level thermometer calibrations from -$202^{\circ}C$ to $250^{\circ}C$ ", Int. J. Thermophys., Vol. 32, No. 11, pp. 2360-2369, 2011.   DOI
7 http://content.fluke.com/comx/pages/hrt_ln2comp_en.htm (retrieved on Jul. 29, 2013)
8 http://www.isotech.co.uk/products/secondarylaboratory/low-temperature-calibration/simplenitrogen-boiling-point-apparatus-model-461.php (retrieved on Jul. 29, 2013)
9 R. E. Bedford, G. Bonnier, H. Maas, and F. Pavese, "Recommended values of temperature on the international temperature scale of 1990 for a selected set of secondary reference points", Metrologia, Vol. 33, No. 2, pp. 133-154, 1996.   DOI   ScienceOn
10 ASTM Standard E 563 - 02, "Standard practice for preparation and use of an ice-point bath as a reference temperature", ASTM International, West Conshohocken, PA, www.astm.org, 2002.
11 J. V. Nicholas and D. R. White, Traceable Temperatures, 2nd edition, Johm Wiley & Sons, Chichester, pp. 203-253 , 2001.
12 C. W. Meyer and W. L. Tew, "ITS-90 nonuniqueness from PRT subrange inconsistencies over the range 24.56 K to 273.16 K", Metrologia, Vol. 43, No. 5, pp. 341-352, 2006.   DOI   ScienceOn
13 "Working group 3 report to CCT : May 2012", http://www.bipm.org/cc/CCT/Allowed/26/WORKING_GROUP_3_REPORT_TO_CCT_2012.pdf (retrieved on Jun. 28, 2013)