Metal temperature changes as the temperature sensor specifications, the resistance value also changes. For different metals, a temperature change of the temperature sensor once, the resistance value change are different, and the resistance value and can be used directly as an output signal. There are two types of resistance changes in temperature = positive temperature coefficient resistance increases the temperature decreases to reduce the negative temperature coefficient of resistance = temperature = resistance decreases temperature decreases = thermistor resistance increases as well as its own measurement techniques. Small size is an advantage thermistor temperature sensor model used, it can be stabilized soon, will not cause the heat load. However, very strong and therefore, a large current will cause self-heating. Because the thermistor is a resistive device, any current source will be in on it because of power caused by heat. Power is equal to the square of the current and the resistance of the product. Therefore, to use a small current source. If the thermistor is exposed to heat, and will result in permanent damage. Through the introduction of two temperature instrument, we want to work and study help. Temperature sensor specifications, Xinfeng (certified), the temperature sensor consists of Xinxiang City, Jiangsu Xinfeng Sensing Technology Co., Ltd. to provide clean. Xinxiang City Xinfeng purification Sensing Technology Co., Ltd. (www.xfcgq.com) is an industry leader in Henan Xinxiang, sensors, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Xinfeng leadership with the staff warmly welcome all inquiries negotiations to create a better future Xinfeng.