Connecting a thermocouple to a Hequan temperature controller allows the controller to display the temperature of the object being measured. Today, the Hequan team will discuss how thermocouples transmit temperature data to the temperature controller.
Hequan Thermocouple
First, let's review the basics of thermocouples. A thermocouple generally has two wires: one is the positive terminal, and the other is the negative terminal. Thermocouples have many types, the most common being K, J, and E. Different types use different materials for their positive and negative terminals. For example, a K-type thermocouple uses nickel-chromium for the positive terminal and nickel-silicon for the negative terminal. A J-type thermocouple uses iron for the positive terminal and copper-nickel for the negative terminal. The end connected to the thermocouple is called the free end, and the rod-shaped end is called the working end. The magnitude of the thermoelectric potential in the thermocouple circuit depends only on the materials of the thermocouple conductors and the temperatures of the two junctions, and is independent of the shape and size of the thermocouple. When the materials of the two thermocouple electrodes are fixed, the thermoelectric potential is simply the difference between the temperatures T and T0 of the two junctions. Because the cold junction T0 is constant, the thermoelectric potential generated by the thermocouple only changes with the temperature of the hot junction (measuring junction). That is, a certain thermoelectric potential corresponds to a certain temperature. We can achieve the purpose of temperature measurement by measuring the thermoelectric potential.
