Study on calibration method of thermocouple cold end compensation box
In thermocouple temperature measurement system,cold end compensation is one of the key factors affecting the meas-urement accuracy.At present,cold end compensation box is used for cold end compensation of thermocouple in reactor engineering test.The cold end compensation box is a standardized product.Combining the requirements of thermal test on the accuracy and trace-ability of temperature values,this paper proposes a calibration method for the cold end compensation box of thermocouples by studying the cold end compensation principle and the working principle of the cold end compensation box,and using the laboratory measure-ment standard device to compare and verify the cold end compensation effect.The results show that the calibration method is accurate and reliable,and the compensation effect of the cold end compensation box is consistent with that of the ice bottle used for thermocou-ple calibration in the laboratory,which can provide a new idea for thermocouple calibration in the laboratory.
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