What is the principle of a thermocouple in an electric heater?

The working principle of the electric heater thermocouple: two different components of the conductor (called thermocouple wire or thermal electrode) is connected to the two ends of the synthetic circuit, when the junction temperature at the same time, in the loop will produce electromotive force, this phenomenon is called the thermoelectric effect, and this is called thermal electromotive force emf. A thermocouple is used to measure temperature of this principle, which is directly used for measuring the temperature of a medium called the working end (also known as the measuring end), the other end is called the cold end (also known as the end of the cold end compensation); and display instrument or meter display instrument connection, will point out that the thermoelectric potential generated by thermocouple.

The thermocouple is actually an energy converter, which converts heat energy into electric energy, and uses the thermoelectric potential to measure the temperature. For the thermoelectric potential of thermocouple, we should pay attention to the following problems.

The thermocouple's thermoelectric potential is the difference of the temperature function at both ends of the thermocouple, but not the function of the temperature difference at both ends of the thermocouple.

The thermoelectric potential produced by thermocouples is independent of the length and diameter of the thermocouple when the material of the thermocouple is homogeneous, which is only related to the composition of the thermocouple material and the temperature difference between the two ends.

When the components of the two thermocouple wires of the thermocouple are determined, the size of the thermoelectric potential of the thermocouple is only related to the temperature difference of the thermocouple. If the temperature of the cold junction of the thermocouple remains constant, the thermoelectric force of the thermocouple is only a single value function of the working temperature.

What is a thermocouple? This is based on the thermocouple principle of temperature measurement. The thermocouple is a temperature sensing element. It is an instrument. It directly measures the temperature and converts the temperature signal into the thermoelectric potential signal, which is converted to the temperature of the measured medium through the electrical instrument (the two instrument).

The basic principle of thermocouple measurement: two different components of the material composed of a conductor loop, both ends when there is a temperature gradient, the loop current will pass, there is Seebeck electromotive force -- Thermal electromotive force between the two ends of this, this is called the Seebeck effect. The two kinds of homogeneous conductor are thermoelectric poles, and the one with higher temperature is the working end. The lower temperature ends are the free ends, and the free ends are usually at a constant temperature. According to the functional relationship between the thermoelectric force and temperature, the thermocouple dividing table is made, and the dividing table is obtained under the condition of the free end temperature at 0 degrees. Different thermocouples have different indexing tables. In the thermocouple access circuit of third kinds of metal materials, as long as the two contact points of the material at the same temperature, the heat generated by the thermocouple will remain unchanged, which is not affected by the third kinds of metal in the loop access. Therefore, when the thermocouple is used to measure the temperature, the measuring instrument can be accessed. After the thermoelectric potential is measured, the temperature electric heater of the measured medium can be known.

The typical applications of the fluid explosion-proof electric heater are as follows:

Chemical industry materials heating and heating, some powder drying, chemical process and spray drying under certain pressure.

Hydrocarbon heating, including oil crude oil, heavy oil, fuel oil, heat conduction oil, oil, stone wax, etc.

Process water, superheated steam, molten salt, nitrogen (air) gas, water gas and so on, and so on.

Because of the advanced explosion-proof structure, the equipment can be widely applied to chemical industry, military industry, petroleum, natural gas, offshore platforms, ships and mining areas.