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. அளவீட்டு முறையின் படி, it can be divided into two categories: தொடர்பு வகை மற்றும் தொடர்பு அல்லாத வகை. According to the sensor material and electronic component characteristics, it can be divided into two categories: thermal resistor and thermocouple.