1. The basic principle of thermocouple temperature measurement
Thermocouple is the most commonly used temperature detecting element in the middle and high temperature area. Its main characteristics are high measurement accuracy and stable performance. It is not only widely used in industrial temperature measurement, but also made into a standard reference instrument.
How thermocouples work:Two conductors or semiconductors of different materials, A and B, are welded together to form A closed loop. When the temperature difference exists between the two persistent points 1 and 2 of conductors A and B, the electromotive force will be generated between them, thus forming A current of A size in the loop. This phenomenon is called thermoelectric effect. Thermocouples use this effect to work. Thermocouple according to the material is the most commonly used K type (4.096mV) K nickel-chromium - nickel-silicon -200-+1000℃,E type (6.319mV), nickel-chromium copper nickel-200 -+700 ℃.
2.The characteristics of the thermocouple
(1) Simple structure and convenient replacement; (2) Pressure spring type temperature sensing element, good seismic performance; (3) High measurement accuracy;(4) Large measurement range; (⑸) Fast thermal response time; ⑹ High mechanical strength and good pressure resistance;It can withstand high temperature up to 2800 degrees. ⑻, long service life;
3. Thermocouple temperature measurement why the use of compensation conductor
When measuring temperature thermocouple, the reference side is stable and reliable, and in actual measurement, the reference side close to the heat source, the temperature is not stable, and the compensating conductor thermoelectric potential in the range of 0-100 ℃ with thermocouple almost exactly the same, can extend thermocouple with compensation lead, make the stable reference end, made it possible to measure
