How to distinguish between thermocouple and thermistor

The difference between thermocouples and thermal resistors is:

1. The temperature measurement principle is different: the temperature measurement principle of thermocouples is based on the thermoelectric effect. The difference between the temperature measurement principle of a thermistor and a thermocouple is that a thermistor measures temperature based on the thermal effect of resistance, that is, the characteristic of the resistance value of the resistor changing with temperature. Therefore, as long as the resistance change of the thermistor is measured, the temperature can be measured.

2. The structure is different: there are two types of thermocouple structures, ordinary type and armored type. Ordinary thermocouples are generally composed of hot electrodes, insulating tubes, protective sleeves, and junction boxes, while armored thermocouples are a solid combination of thermocouple wires, insulating materials, and metal protective sleeves assembled and stretched.

3. Compensation wires are different: Different thermocouples require different compensation wires, which are mainly used to connect with the thermocouple, keep the reference end of the thermocouple away from the power supply, and thus stabilize the temperature of the reference end. Thermistors and thermocouples have the same type of differentiation, but they do not require compensating wires and are cheaper than thermocouples.