How does the thermocouple work?
How does the thermocouple work? In the case of
The basic principle of thermocouple temperature measurement is the composition of two different components of the material composition of the closed loop, when there is a temperature gradient between the two, the circuit will have a current through, there is now between the two Seebeck electromotive force - thermoelectromotive force, which is The so called Sebeck effect. Two kinds of different components of the homogeneous conductor for the hot electrode, the higher the temperature of the end of the work side, the lower end of the temperature is free, free end is generally at a stable temperature. According to the thermoelectromotive force and temperature as a function of contact, made thermocouple indexing table; sub-table is the free temperature at 0 ℃ under the conditions obtained, not the same thermocouple has a different index table.
In the thermocouple circuit access to the third metal data, only the temperature of the two contacts of the same information, the thermocouple occurs thermoelectric power will remain unchanged, that is not affected by the third metal access circuit The Therefore, the thermocouple temperature measurement, access to the measurement of the appearance of the measured thermoelectromotive force, you can know the temperature of the measured medium.
