The working principle of thermocouple _ instrument with the practical application2

Commonly used in low temperature zone thermocouple is a kind of temperature detector. Its main characteristic is high accuracy, stable performance. The platinum thermocouple measuring accuracy is high, it is not only widely used in industrial temperature measurement, and is made into standard benchmark instrument. Thermocouple temperature measuring thermocouple temperature measurement principle and the material is based on the metal conductor resistance value increases with the increase of the temperature of the properties for temperature measurement. Thermocouples are mostly made of pure metal materials, the application is a lot of platinum and copper, in addition, now began to use the materials such as nickel, manganese and rhodium thermocouple. The type of thermocouple type thermocouple from thermocouple temperature measurement principle, the measured temperature change is directly measured by thermocouple resistance change, therefore, the wires of a thermocouple body such as a variety of wire resistance change will affect temperature measurement. End thermocouple temperature sensing element resistance wire winding by special processing, close to the face in the thermometer. Compared with general axial thermocouple, it can reflect more correctly and quickly end face of the actual temperature being measured, is suitable for measuring temperature bearing and other parts of the face. Junction box flameproof thermocouple with special structure, its shell internal explosive mixed gas by sparks or electric arc affected explosion limit within the junction box, that wouldn't make production field explosion. Flameproof thermocouple can be used in the Bla B3c level zone with explosion danger place temperature measurement.