A temperature sensor is a sensor that senses temperature and converts it into a usable output signal. The temperature sensor is the core part of the temperature measuring instrument, and there are many varieties. According to the measurement method, it can be divided into two categories: contact type and non-contact type. According to the characteristics of sensor materials and electronic components, it can be divided into two categories: thermal resistance and thermocouple.

Considerations when choosing a temperature sensor:

1. Whether the environmental conditions of the measured object have any damage to the temperature measuring element.

2. Whether the temperature of the measured object needs to be recorded, alarmed and automatically controlled, and whether it needs to be measured and transmitted remotely.

3. In the case where the temperature of the measured object changes with time, whether the lag of the temperature measuring element can meet the temperature measuring requirements.

4. The size and accuracy of the temperature measurement range.

5. Whether the size of the temperature measuring element is appropriate.

6. The price is guaranteed and whether it is convenient to use.