The working principle of thermocouple

The working principle of thermocouple is use closed circuit composed of two different materials; When the temperature of the two side not at the same time, there will be a current. Again through measuring instrument, it's easier to get the temperature of the medium

the basic principle of thermocouple temperature measurement are two kinds of different ingredients of closed loop conductor material composition, when there is a temperature gradient when two loop will have electric current passes through, now exists between the two head Seebeck electromotive force - — Thermoelectric emf, this is the so-called seebeck effect.

two different components of homogeneous conductor electrode as heat, the temperature is higher at one end of the end for homework, temperature low end to end, free end is at a stable temperature. According to the thermoelectric emfs associated with a function of temperature, the thermocouple indexing table; Indexing table is free end temperature at 0 ℃, under the condition of different thermocouples with different indexing table.

access to the third metal materials in the thermocouple loop when only two junction temperature, the data of thermocouple thermoelectric is set to the same, which is not affected by the third metal access in the loop. Therefore, when the thermocouple temperature measurement, appearance can access measurement, measured after the thermoelectric emfs, can know the temperature of the measured medium.