What are the main thermocouple?

Thermocouple is one of the most commonly used temperature detecting element in industry, is an instrument. It directly measuring the temperature and the temperature signals into a thermoelectric emfs, through electrical instrument ( Secondary instrument) Convert the temperature of the measured medium. Thermocouple mainly used for measuring temperature parameters in industrial production process. Thermocouple is actually a kind of energy converter, it converts heat into electricity, using thermoelectric potential generated by the measuring temperature. Thermocouple features:

1, the assembly is simple, easy to change

2, reed temperature sensing element, the seismic performance is good

3, large measuring range, high accuracy

4, high mechanical strength, good compression performance

5, resistance to high temperature can reach 2400 degrees

6, simple structure, easy to use.

thermocouple type: thermocouple assembly, armoured thermocouple, thermocouple, pressure spring fixed thermocouples, high temperature thermocouple, platinum, rhodium thermocouple, anticorrosive thermocouple, thermocouple, wear-resisting high-pressure thermocouple, special thermocouple, handheld thermocouple, miniature thermocouple, the precious metal thermocouple, thermocouple, fast tungsten-rhenium thermocouples, etc.

there are two kinds of structure of the thermocouple, regular and armor type. Ordinary thermocouples generally by the hot electrode, insulation tube, protective casing and junction box parts, and armoured thermocouple is the thermocouple wire, insulation material and metal protective casing combination after assembly, after stretching processing from a combination of a solid. But it takes a special electrical signal of thermocouple wires to pass, this kind of wire we called compensation conductor. Different thermocouples require different compensation conductor, its main function is connected to the thermocouple, away from the power of the reference junction of the thermocouple, so that the reference temperature stability.

how it works: thermocouple temperature measurement principle is based on thermoelectric effect. Connect the two different conductor or semiconductor into closed loops, when the two contacts in temperature is not at the same time, the circuit will produce thermoelectric potential, this kind of phenomenon called the thermoelectric effect, also known as the seebeck effect. There are two kinds of closed loop of thermoelectric potential of electric potential; The thermoelectric potential and contact potential. Thermoelectric potential means the same at both ends of the conductor potential because of the different temperature, different conductors with different electron density, so they produced by electric potential is not the same, the contact potential as its name implies is refers to the two different conductor in contact, because of their different electron density so produce certain electronic diffusion, when they reach a certain potential, which is formed by the balance after the contact potential depends on the size of the two different conductor material properties and their temperature contact point.