Three-wire: Connect one end of the heat resistance of the base of one of the leads, and the other end connected to the two leads is called three-wire, this approach is usually the price of the thermal resistance of the bridge supporting the use of armor, you can better eliminate lead resistance the impact of industrial process control most commonly used. Four-wire system: at the root ends of the thermal resistance of the connecting two wires is called four-wire system, where the two leads for RTD provides a constant current I picture armored thermal resistance, to be converted into a voltage signal U R armored RTD offer, and then through the other two leads to U lead to secondary instrument. This approach can be seen completely eliminate lead wire resistance influence, mainly for high-precision temperature testing. 1, the working principle of almost all of the thermal resistance and resistivity of a semiconductor conductor with its own temperature are changed by the change, and there is a certain value, this physical phenomenon is called "thermal resistance effect." If we can find or have known thermal resistance is correspondence between temperature change, the instrument can be measured by measuring the electrical resistance value, achieve the purpose of measuring the temperature. Using a temperature measuring element made of this principle is called thermal resistance or thermistor, RTD is evenly with a thin metal wire around double the supply of armored thermal resistance on the skeleton made of insulating material made of _ Since the force measuring instrument armored thermal resistance _ Beijing armored thermal resistance provided by the Shanghai Automation Instrumentation Co. measured. Shanghai Automation Instrumentation Co., force measurement (www.licesh.com) is the Shanghai Zhabei District, flow meters leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Since the force measuring device leadership with the staff warmly welcome all inquiries negotiations to create the force measuring instrument since a better future.