Three-wire: Connect one end of the thermal resistance of the leads in the roots, and the other end connected to the two leads is called three-wire, this approach usually associated with a bridge supporting the use of explosion-proof thermal resistance pictures, you can better eliminate lead resistance 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 RTD offer proof, which provides a constant current I lead two thermal resistance factory explosion thermal resistance, the R is converted into a voltage signal U, 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. Industrial platinum resistance thermometer for checking the feasibility of indexing explosion thermal resistance, and temperature CVD equation widely used to give - the electrical resistance compared with the results, and then given the existence of differences between the two, and to explore the establishment of precision industrial platinum resistance thermometer as a transfer standard approach and method. Through the different models, different manufacturers of multi-branch industrial platinum resistance temperature zones were carried out in different research and analysis, experimental results are given each thermometer data curve and using two different methods of measurement error caused by indexing. Explosion RTD quote _ force since the instrument measuring the quality assurance (certified) _ Hunan proof thermal resistance measured by the Shanghai Automation Instrumentation Co., Ltd .. 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.