Calibration of Industrial Platinum Resistance Thermometers up to $$700\,^{\circ }\mathrm{C}$$ 700 ∘ C

Autor: Heikki Kajastie, M. Ojanen, R. Strnad, Martti Heinonen, O. Hahtela, Kari Riski
Rok vydání: 2014
Předmět:
Zdroj: International Journal of Thermophysics. 35:668-680
ISSN: 1572-9567
0195-928X
DOI: 10.1007/s10765-014-1588-2
Popis: 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.
Databáze: OpenAIRE
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