The structure of temperature sensor: temperature measuring element, protection device, transmission device; Some with a fixed way, with a junction box, there will be a meter display is also called a temperature sensor. It is normal to see that the temperature sensor used by the motor is a stainless steel protective tube (inside is a platinum thermal resistance temperature measuring element). A set screw followed by a lead leads to the junction box.
For other temperature sensors, the temperature measuring element may be small, and the volume after the protection device is installed is not large, but the main structure is basically the same, and the temperature measuring element protection lead.