The platinum thermocouple measuring accuracy is high, it is not only widely used in industrial temperature measurement, and is made into standard benchmark instrument. Commonly used in low temperature zone thermocouple temperature sensor is a temperature detector. Its main characteristic is high accuracy, stable performance. Thermocouple temperature sensor thermocouple temperature measurement principle and material temperature sensor are mostly made of pure metal materials, the current application is a lot of platinum and copper, in addition, now has started using survey, nickel, manganese and rhodium thermocouple materials such as temperature sensor. The temperature sensor of thermocouple temperature measurement is based on the metal conductor resistance value increases with the increase of the temperature of the properties for temperature measurement. The structure of thermocouple temperature sensor is proficient in type thermocouple temperature sensor as a result, the temperature sensor of thermocouple lead wire and other wire resistance change will affect temperature measurement. From the temperature sensor of thermocouple temperature measurement principle, the change in temperature is being measured directly by thermocouple temperature sensor to measure the resistance of the change. Temperature sensor thermocouple temperature measuring thermocouple temperature sensor system generally by the thermocouple temperature sensor, connecting wire ( Can also be called compensation conductor) And display instrument, etc. Compared with the conventional type thermocouple temperature sensor, it has the following advantages: (1) small volume, no internal air gap, thermal inertia, small measuring hysteresis; (2) good mechanical properties, resistance to vibration and shock. (3) can bend, easy to install (4) long service life. Thermocouple temperature sensor consists of thermal components ( The resistor body) , wire, insulation materials, stainless steel casing combination solid body, its diameter is generally from 2 to 8 mm, achieve more xiaoke phi is 0. 25mm。 Pt100 platinum resistance - 200 ~ 600 ℃ grade A: - ( 0. 15 + 0. 002年∣t∣) ±0. 6 B: - ( 0. 30 + 0. 005年∣t∣) ±0. 12 Cu50 - copper resistance 50~150℃ ±（ 0. 30 + 0. 006∣t∣） ±0. 12 Cu100 ±0. 10 end thermocouple temperature sensor which compared with general axial thermocouple temperature sensor, can more accurately and quickly to reflect the actual temperature of end face, is suitable for measuring temperature bearing and other parts of the face. End face temperature thermocouple temperature sensor element resistance wire winding by special processing, close to the face in the thermometer. Flameproof thermocouple temperature sensor flameproof thermocouple temperature sensor can be used in the Bla ~ B3c zone with explosion danger place temperature measurement. Flameproof thermocouple temperature sensor through the special structure of the junction box, its shell internal explosive mixed gas by affected by sparks or electric arc explosion limit within the junction box, that wouldn't make production field explosion. Temperature sensor of thermocouple temperature measurement system, must pay attention to the thermocouple temperature sensor and digital display instrument index number must be consistent.