Thermocouple structures in order to ensure that the thermocouple is reliable and stable work, its structure is as follows:
1, two thermoelectric thermocouple composed of welding to be fixed;
2, between the two heat each other should be well insulated to prevent short circuits;
3, compensating cables connect to the free end of the thermocouple to be convenient and reliable;
4, protection sleeve should ensure full heat and harmful media isolation.
Working principle
1, thermocouple EMF is the thermocouple junction temperature at both ends of the differential of a function, instead of thermocouple cold end with end function of temperature difference on both ends;
Size of 2, generated by the thermocouple thermoelectric power, when the thermocouple materials are uniform, and has nothing to do with the length and diameter of the thermocouple, thermocouple materials relating to the composition and the temperature difference between the ends;
3, when two of the thermocouple thermocouple wire material composition is determined, size of the thermocouple EMF, concerned only with the thermocouple temperature difference; if the thermocouple cold junction temperature to be maintained, the working temperature of the thermocouple thermoelectric power is only single-valued function. The two conductors or semiconductor a and b of different materials welded together to form a closed loop, as shown in the figure. When the conductor a and b two attachment points 1 and 2 when there is a temperature difference, between EMF and current in the circuit forming a size. Thermocouple is used this effect to work.