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从事温度计量工作的同志都知道，热电偶的工作原理--两种不同导体组成闭合回路，当它的两端温度相等时，其回路热电势为零。当热电偶工作端与自由端温度不相等时，闭合回路中产生热电势。热电势的大小与两端温度差有关。热电偶的自由端温度不是一个恒定值。厂家都采用热电偶专
The comrades working on temperature measurement know that the working principle of a thermocouple - two different conductors form a closed circuit, its loop thermopower is zero when its temperature is equal at both ends. When the thermocouple working end and the free end of the temperature is not equal, the thermoelectric power generated in the closed loop. The size of the thermoelectric power is related to the temperature difference between two ends. Thermocouple free end temperature is not a constant value. Manufacturers are using thermocouple