RTD temperature is increased with increasing temperature resistance value based on the characteristics of metal conductors for temperature measurement. Most of the thermal resistance from the pure metal material, currently the most widely used high-quality sensors platinum and copper, in addition, have begun to use nickel, manganese and rhodium and other materials RTD. RTD sensor is primarily a function of the temperature change by a resistance value of the characteristic to measure temperature and temperature-related parameter. Temperature detection accuracy sensor applications requiring high classification, this sensor is more appropriate. More extensive thermal resistance materials as platinum, copper, nickel, etc., they have a large temperature coefficient of resistance, good linearity, stability, wide temperature range, easy processing characteristics. For measuring the temperature within the range -200 ℃ ~ + 500 ℃ of. Physical type sensor is measuring substance use is the occurrence of a significant change in the nature of some of the physical properties of steel. Chemical sensors is the use of chemical substances able composition, concentration and other chemical quantity is converted to electrical quantity of sensitive elements made. Biological sensors is the use of a variety of biological or biological properties of substances made to detect and identify the chemical constituents in vivo sensors. Sensor function _ Xinfeng (certified) _ The sensor consists of Xinxiang City, 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.