Temperature sensor refers to a sensor that can sense temperature and convert it into a usable output signal. Temperature sensor is the core part of temperature measuring instruments and there are many varieties. پیمائش کے طریقہ کار کے مطابق, it can be divided into two categories: رابطہ کی قسم اور غیر رابطہ کی قسم. According to the sensor material and electronic component characteristics, it can be divided into two categories: thermal resistor and thermocouple.