thermal resistorThermal resistor is a commonly used temperature detector in the medium to low temperature range. Thermal resistance temperature measurement is based on the characteristic that the resistance value of metal conductors increases with temperature. Its main features are high measurement accuracy and stable performance. The measurement accuracy of platinum resistance thermometer is relatively high, and it is not only widely used in industrial temperature measurement, but also made into a standard reference instrument. Thermistors are mostly made of pure metal materials, with platinum and copper being the most commonly used. In addition, materials such as nickel, manganese, and rhodium have begun to be used to manufacture thermistors. There are many types of temperature sensing materials commonly used in metal thermistors, with platinum wire being the most commonly used. In addition to platinum wire, there are also copper, nickel, iron, iron nickel and other metal thermistor materials used in industrial measurement.

becausethermal resistorThe different electron densities result in certain electron diffusion, and the potential formed when they reach a certain equilibrium depends on the material properties of the two different conductors and the temperature at their contact points. The thermocouples currently in use have a standard specification However, the electrical signal of a thermocouple requires a special type of wire for transmission, which we call a compensating wire. Different thermocouples require different compensation wires, which are mainly used to connect with the thermocouple and keep the reference end of the thermocouple away from the power supply

The internal mixed gas inside the shell of the thermal resistor is affected by sparks or arcs, which inevitably changes the length of the resistance wire and affects the resistance value. Therefore, it is better to replace the resistor with a new one. If welding repair is used, it must be verified to be qualified after welding before use. The change in the measured temperature is directly measured by the change in the resistance value of the thermistor, therefore, the changes in the resistance of various wires such as the lead wires of the thermistor body will have an impact on temperature measurement. This method is usually used in conjunction with an electric bridge, which can effectively eliminate the influence of lead resistance and is commonly used in industrial process control.

When the thermal resistor is confined inside the junction box due to sparks or arcs, it will not be affected on the production site and will be tightly attached to the end face of the thermometer. Compared with general axial resistance thermometers, it can more accurately and quickly reflect the actual temperature of the measured end face, and is suitable for measuring the end face temperature of bearing shells and other components.