Abstract
Industrial grade platinum resistance thermometers were calibrated in the temperature range from \(200\,^{\circ }\mathrm{C}\) to \(700\,^{\circ }\mathrm{C}\). 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 \(R(30\,^{\circ }\mathrm{C})/R(10\,^{\circ }\mathrm{C})\) 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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Acknowledgments
The authors want to thank Mr. Vesa Tepponen from SKS Automaatio Oy for providing the wire-wound sensors and assembling the thermometers. We also want to thank Mrs. Tine Nielsen from Innnovation Sensor Technology for providing the thin-film sensors. The research leading to these results has received funding from the European Union on the basis of Decision No. 912/2009/EC.
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Hahtela, O., Heinonen, M., Kajastie, H. et al. Calibration of Industrial Platinum Resistance Thermometers up to \(700\,^{\circ }\mathrm{C}\) . Int J Thermophys 35, 668–680 (2014). https://doi.org/10.1007/s10765-014-1588-2
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DOI: https://doi.org/10.1007/s10765-014-1588-2