热电偶测温的两个实际问题的误差分析及解决方法

Analysing the Two Problems About the Error of theTemperature Measured by a Thermocouple and the Solution to Them

论述用三线补偿测温系统,克服用热电偶测温时,因冷端温度高于100℃,或补偿导线与热电偶不配套时产生测量误差的原理。

When a thermocouple is used to measure the temperature,there is an error of the measured temperature because the temperature of the cold end is high above 100℃ and the compensating conductor is not matched with the thermocouple.By using the measurement system of three wire compensations,the error can be corrected.In the following,the principle of the system will be discussed.