The temperature sensor is a sensor that utilizes the law of various physical properties of a substance as a function of temperature to convert temperature into electrical quantity. These physical properties that exhibit regular changes are mainly physical. The temperature sensor is the core part of the temperature measuring instrument and it has a wide variety of products. According to the measurement method, it can be divided into two types: contact type and non-contact type. It is divided into thermal resistance and thermocouple according to the characteristics of sensor materials and electronic components.