Compensation wire is divided into two kinds of compensation type and extension of three-wire RTD Main, extension wire chemical composition and compensated thermocouple same, but in practice, it does not extend the type of wire and thermocouple with the same material metal, and generally use the same thermocouple wires instead of the electron density. Compensation wire thermocouple wires are generally very clear three-wire RTD, thermocouple compensation wire connecting the positive red wire three-wire RTD prices, while the negative is connected to the rest of the colors. Most of the general compensation wire materials are copper-nickel alloy. 3. The results of the maintenance cycle maintenance and repair cycle 3.1: 3.1.1 for the resistance value of the Class B platinum RTD to take third place after the decimal point, the temperature coefficient of the sixth decimal; Take A grade platinum resistance thermal resistance to the fourth decimal place, the temperature coefficient to take seventh place after the decimal point. 3.1.2 meets the "thermal resistance certified by the Standard Rules" provides thermal resistance judged as qualified, otherwise unqualified. 3.1.3 When the thermal resistance of the resistance coefficient of a deviation exceeds the allowable value of three-wire RTD wholesale, but at 0 ℃, 100 ℃ and resistance points are in line with the maximum temperature tolerance requirements, the thermal resistance was judged as acceptable , otherwise it is failed. 3.1.4 certificated comply with the requirements of the thermal resistance and temperature sensing element test certificate issued; do not meet the requirements of the regulations issued notices test results. 3.3.5 Thermal resistance test cycle should be based on the specific circumstances of the provisions, shall not exceed one year. 3.3.6 For random damage to the thermal resistance elements, they also must be replaced after passing the check before installation. Three-wire RTD measurement since the instrument's main force _ the lowest (certified) _ Three-wire RTD measurements provided 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.