2. Maintenance 2.1 protect the casing wear .2.1.1 visual inspection visual inspection: use pliers or pipe wrench to protect the tube temperature sensing element is removed, check the protective tube should not be bent, skew, partial pressure, blockage, crack, trachoma and severe corrosion and wear and other defects. For protection tube Pt100 RTD element is welded to the pipe on offer, can not be removed because it is restricted, you should take advantage of the size of the repair time for protective tube inspection and maintenance. RTD three-wire connection. Three-wire connection to eliminate measurement errors caused by lead resistance. This is because the measurement of thermal resistance of the circuit is generally unbalanced bridge. Thermal resistance as a bridge arm resistance Pt100 RTD Main, connecting wires (from the thermal resistance to the control room) has become part of the bridge arm resistance of this part of the resistance is unknown and with changes in ambient temperature Pt100 RTD picture , resulting in a measurement error. Three-wire, the wire connected to a power supply terminal of the bridge, the other two are respectively connected to the thermal resistance of the bridge where the arm and the adjacent bridge arm, which eliminates measurement errors caused by lead wire resistance. Hangzhou Pt100 RTD | Shanghai Automation Instrumentation force measurement | Pt100 RTD providers force measured by the Shanghai Automation Instrumentation Co., Ltd. "Industrial thermocouple, RTD, transmitters, flowmeters, intelligent instruments, actuators' preferred measure of the Shanghai Automation Instrumentation Co., Ltd. (www.licesh.com), the company is located: Zhabei District, Shanghai Luochuan Road 638 No, for many years, since the force measuring instrument to provide customers with the best quality service, contact: Hua powder. Welcome to the new and old customers call, letter, visit the guide, business negotiations. Force measurement since the instrument expect to be your long-term partner!