Study on the reliability of comparison method for thermocouples in industry around 1324 °C

摘要

To examine the reliability of thermocouple comparison in industry at high temperature, thermocouple comparison measurements were performed around 1324 °C in nine laboratories by using two Pt/Pd thermocouples and one type R thermocouple following calibration at Co-C eutectic point. It was found that the standard deviations of the emf values of the Pt/Pd-2 (one of the Pt/Pd thermocouples) and type R thermocouples among nine participating laboratories were 4.2 μV (0.2 °C) and 5.0 μV (0.4 °C), respectively.