Apr 14, 2022
Do you know the temperature sensor thermocouple, how the temperature is transmitted to the temperature control?
Thermocouple generally has two lines, one is the positive thermocouple, the other is the negative thermocouple, thermocouple has many index numbers, common index numbers in general: K type, J type, E type, etc., index numbers are different, then they are different materials used for positive and negative poles.
For example, type K thermocouple, its positive electrode with nickel-chromium, negative electrode with nickel-silicon. type J thermocouple positive electrode with iron, negative electrode with copper-nickel. The end connected to the thermocouple is called the free end, and the stick end becomes the working end of the thermocouple. Thermocouple circuit in the size of the thermoelectric potential, only with the composition of the thermocouple conductor material and the temperature of the two contacts, but not with the shape and size of the thermocouple, when the thermocouple poles material is fixed, the thermoelectric potential is the difference between the two contacts temperature T and T0 function. Because the cold end T0 constant, thermocouple generated by the thermoelectric potential only with the hot end (measuring end) temperature changes, that is, a certain thermoelectric potential corresponds to a certain temperature, we just use the method of measuring the thermoelectric potential can achieve the purpose of temperature measurement.
