Today let's talk about temperature measurement devices in thermal simulation. Industrial temperature measurement devices are divided into two types: thermal resistance and thermocouple. Although the terminology is similar, the principles are quite different, let's start by talking about thermal resistance. Thermal resistance is based on the thermal effect of the temperature measured by the resistance, i.e. the thermal simulation of a resistance resistance cannot be done without the characteristic of a thermocouple that changes with temperature. Therefore, as long as the resistance change of the thermal resistance is measured, the temperature can be measured. At present, there are mainly two types of metal thermistors and semiconductor thermistors. The most widely used thermal resistance materials are platinum and copper: platinum resistance has high precision, is suitable for neutral and oxidizing media, has good stability, and has Certain nonlinearity, the higher the temperature, the smaller the resistance change rate. The resistance value of copper resistors has a linear relationship with temperature within the temperature measurement range. The number of temperature lines is large, again introducing thermocouples. Thermocouples are the most widely used temperature devices in temperature measurement. Its main features are a wide temperature measurement range, relatively stable performance, simple structure, good dynamic response, and the ability to remotely transmit 4-20mA electrical signals, which is convenient for automatic control and centralized control. The thermocouple temperature measurement principle is based on the thermoelectric effect where two different conductors or semiconductors are connected into a closed loop. When the temperature of the two contacts is different, a thermoelectric potential is generated in the circuit. This phenomenon is called the thermoelectric effect, also known as the Seebeck effect, and the thermoelectric potential generated in a closed loop consists of two electric potentials. Thermoelectric potential and contact potential Thermoelectric potential refers to the electric potential generated at different temperatures at both ends of the same conductor.
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