Temperature Measuring Resistor

Temperature-measuring resistors conduct temperature measurement based on the characteristic that the resistance value of metal conductors increases with temperature rise. Most of them are made of pure metal materials, with platinum and copper being widely used currently. Adopting a plug-in type, they are easy to install. The socket-type platinum thermal resistor element uses a micro ceramic tube, with a pre-wound platinum thermal resistance wire coil installed in the tube hole to form a temperature-sensing element. The temperature-sensing element is made quite small (the minimum outer diameter can reach Ф1.6～Ф1.2mm) and is used to manufacture various micro temperature sensor probes. It also adopts a plug-in type for easy installation and is suitable for measuring the temperature of liquids, gases and solid surfaces within the range of -200℃ to +450℃.

The temperature-measuring resistor adopts a plug-in type for convenient installation. It is applicable for temperature measurement of liquids, gases and solid surfaces in the range of -200℃ to +450℃. Main technical parameters: Accuracy class: A and B; Protection class: IP65; Nominal pressure: —. Thermal resistors perform temperature measurement based on the thermal effect of resistance, that is, the characteristic that the resistance value of the resistor body changes with temperature.

Therefore, temperature can be measured as long as the resistance change of the temperature-sensing thermal resistor is detected. Currently, there are mainly two types: metal thermal resistors and semiconductor thermistors. The resistance value and temperature of metal thermal resistors can generally be expressed by the following approximate formula, while the temperature-resistance relationship of temperature-measuring resistors depends on the structural constants of the semiconductor material.

By comparison, thermistors have a larger temperature coefficient and higher resistance value at room temperature (usually above several thousand ohms). However, they have poor interchangeability, severe nonlinearity, and a narrow temperature measurement range of only about -50℃ to 300℃, so they are widely used in temperature detection and control of household appliances and automobiles. Temperature-measuring resistors are generally suitable for temperature measurement within the range of -200℃ to 500℃. They are characterized by high measurement accuracy, good stability and reliable performance, and are widely used in process control.