Take you know what - thermal resistance of the common malfunction Shanghai dragon instrument electric appliance co. , LTD

Thermal resistance is low temperature zone in the most commonly used one kind of temperature measuring element. Under normal circumstances, the measurement of above 500 ℃ high temperature with thermocouple, but thermocouple under 500 ℃ low temperature regions, because of its output thermoelectric power is small, high anti-interference measures requirements for secondary appearance, if choose thermocouple generally difficult to achieve accurate measurement. In relatively low temperature area, therefore, in consideration of the cold end temperature change caused by the relative error is also very outstanding, commonly used thermal resistance temperature measurement is more suitable for appearance, this is because in low temperature area has a high accuracy of measurement, thermal resistor function in secure characteristics, thermal resistance measurement principle according to the resistance of the conductor or semiconductor materials and the function relation between the temperature. The conductor or when the temperature changes and the change of the resistance of the semiconductor, then appeared after appearance shows the temperature of the measured target value. Thermal resistance are mostly made of pure metal materials, and now the most widely used thermal resistance data are platinum and copper. Platinum resistance high accuracy, suitable for neutral and oxidizing medium, safe sex good, which are nonlinear, must have the higher the temperature the smaller resistance change rate. Copper resistance in the temperature measurement range internal resistance value and temperature is linear, suitable for non-corrosive medium. In addition, selection of nickel, manganese and rhodium data making, heat resistance, heat resistance temperature measurement system composition and join way: heat resistance temperature measurement system composed of thermal resistance temperature measurement system by thermal resistance, connecting wires and commonly show appearance, etc.