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


    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
    Issue number3-4
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed


    • calibration
    • thermometers
    • temperatures

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