Calibration of industrial platinum resistance thermometers up to 700°C

O. Hahtela, M. Heinonen, H. Kajastie, M. Ojanen, K. Riski (Corresponding Author), R. Strnad

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Industrial grade platinum resistance thermometers were calibrated in the temperature range from 200°C to 700°C . Both wire-wound and thin-film sensor-based thermometers were investigated. The purpose of the study was to investigate thermometers which could be used in future coal power plants. The calibrations were performed in a vertical cesium heat-pipe furnace and in a horizontal and vertical sodium heat-pipe furnace. The reference thermometer was a standard platinum resistance thermometer calibrated at fixed points up to the aluminum point. In addition to calibration, various thermal tests including immersion measurements and thermal-cycling tests were performed. The stability of the sensors was determined by monitoring the ice-point resistance. Possible contamination of the sensors was determined by measuring the resistance ratio R(30°C)/R(10°C) several times during the measurement period. The calibration curves were compared with the ICE 60751 standard and International Temperature Scale 1990 (ITS-90) reference functions. Considerable changes were found in all tested thermometers. The wire-wound sensors were more stable than the thin-film sensors.
Original languageEnglish
Pages (from-to)668-680
JournalInternational Journal of Thermophysics
Volume35
Issue number3-4
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

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resistance thermometers
thermometers
platinum
sensors
heat pipes
furnaces
thermal cycling tests
wire
temperature scales
power plants
thin films
cesium
coal
submerging
grade
ice
contamination
sodium
aluminum
curves

Keywords

  • calibration
  • thermometers
  • temperatures

Cite this

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title = "Calibration of industrial platinum resistance thermometers up to 700°C",
abstract = "Industrial grade platinum resistance thermometers were calibrated in the temperature range from 200°C to 700°C . Both wire-wound and thin-film sensor-based thermometers were investigated. The purpose of the study was to investigate thermometers which could be used in future coal power plants. The calibrations were performed in a vertical cesium heat-pipe furnace and in a horizontal and vertical sodium heat-pipe furnace. The reference thermometer was a standard platinum resistance thermometer calibrated at fixed points up to the aluminum point. In addition to calibration, various thermal tests including immersion measurements and thermal-cycling tests were performed. The stability of the sensors was determined by monitoring the ice-point resistance. Possible contamination of the sensors was determined by measuring the resistance ratio R(30°C)/R(10°C) several times during the measurement period. The calibration curves were compared with the ICE 60751 standard and International Temperature Scale 1990 (ITS-90) reference functions. Considerable changes were found in all tested thermometers. The wire-wound sensors were more stable than the thin-film sensors.",
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Calibration of industrial platinum resistance thermometers up to 700°C. / Hahtela, O.; Heinonen, M.; Kajastie, H.; Ojanen, M.; Riski, K. (Corresponding Author); Strnad, R.

In: International Journal of Thermophysics, Vol. 35, No. 3-4, 2014, p. 668-680.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Hahtela, O.

AU - Heinonen, M.

AU - Kajastie, H.

AU - Ojanen, M.

AU - Riski, K.

AU - Strnad, R.

PY - 2014

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N2 - Industrial grade platinum resistance thermometers were calibrated in the temperature range from 200°C to 700°C . Both wire-wound and thin-film sensor-based thermometers were investigated. The purpose of the study was to investigate thermometers which could be used in future coal power plants. The calibrations were performed in a vertical cesium heat-pipe furnace and in a horizontal and vertical sodium heat-pipe furnace. The reference thermometer was a standard platinum resistance thermometer calibrated at fixed points up to the aluminum point. In addition to calibration, various thermal tests including immersion measurements and thermal-cycling tests were performed. The stability of the sensors was determined by monitoring the ice-point resistance. Possible contamination of the sensors was determined by measuring the resistance ratio R(30°C)/R(10°C) several times during the measurement period. The calibration curves were compared with the ICE 60751 standard and International Temperature Scale 1990 (ITS-90) reference functions. Considerable changes were found in all tested thermometers. The wire-wound sensors were more stable than the thin-film sensors.

AB - Industrial grade platinum resistance thermometers were calibrated in the temperature range from 200°C to 700°C . Both wire-wound and thin-film sensor-based thermometers were investigated. The purpose of the study was to investigate thermometers which could be used in future coal power plants. The calibrations were performed in a vertical cesium heat-pipe furnace and in a horizontal and vertical sodium heat-pipe furnace. The reference thermometer was a standard platinum resistance thermometer calibrated at fixed points up to the aluminum point. In addition to calibration, various thermal tests including immersion measurements and thermal-cycling tests were performed. The stability of the sensors was determined by monitoring the ice-point resistance. Possible contamination of the sensors was determined by measuring the resistance ratio R(30°C)/R(10°C) several times during the measurement period. The calibration curves were compared with the ICE 60751 standard and International Temperature Scale 1990 (ITS-90) reference functions. Considerable changes were found in all tested thermometers. The wire-wound sensors were more stable than the thin-film sensors.

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