The difference between the special thermocouple for cracking furnace and the armored thermocouple

The thermoelectric potential of the armored thermocouple will increase as the temperature of the measuring end increases. The size of the thermoelectric potential is only related to the material of the thermocouple conductor and the temperature difference between the two ends, and has nothing to do with the length and diameter of the thermoelectrode.
The two ends of the conductors of two different components are welded to form a loop. The direct temperature measuring end is called the working end, and the terminal end is called the cold end, also known as the reference end. When there is a temperature difference between the working end and the reference end, a thermal current will be generated in the loop. When the display instrument is connected, the corresponding temperature value of the thermoelectric potential generated by the thermocouple will be indicated on the instrument.
The special thermocouple protection tube for the cracking furnace adopts a special structure, which makes it close to the inside of the cracking furnace tube without affecting the flow of materials. It is suitable for the temperature measurement and control of the cracking furnace in the ethylene production process.
The structural principle of the armored thermocouple
It is composed of conductors, high-insulation magnesium oxide, and outer jacket 1Cr18Ni9Ti stainless steel protection tubes, which are drawn one-piece multiple times. The armored thermocouple product mainly consists of a junction box, a terminal and an armored thermocouple, and is equipped with various installation and fixing devices.
Armored thermocouples are divided into two types: insulated type and shell type.
It has many advantages such as bendability, high pressure resistance, fast thermal response time and durability. It is used as a temperature sensor like industrial use, usually with display instruments, recording instruments and electronic regulators. At the same time, it can also be used as a temperature sensing element. It can directly measure the temperature of liquids, steam and its gas medium and solid surface in the range of 0℃~800℃ in various production processes. Compared with, armored thermocouples have the advantages of bendability, high pressure resistance, short thermal response time and durability.
Thermocouple temperature measurement principle
is based on the thermoelectric effect. When two different conductors or semiconductors are connected into a closed loop, when the temperatures at the two junctions are different, a thermoelectric potential will be generated in the loop. This phenomenon is called the thermoelectric effect, also known as the Seebeck effect.
As a temperature measurement sensor, armored thermocouples are usually used in conjunction with temperature transmitters, regulators and display instruments to form a process control system to directly measure or control the temperature of fluids, steam and gas media and solid surfaces within the range of 0-1800℃ in various production processes.
Armored thermocouples have many advantages such as bendability, high pressure resistance, fast thermal response time and durability. Like industrial assembled thermocouples, they are used as temperature measurement sensors and are usually used in conjunction with display instruments, recording instruments and electronic regulators.