Characteristics and working principle of armored thermocouple

Armored thermocouple is the most widely used temperature device in temperature measurement. Its main features are wide temperature measurement range, relatively stable performance, simple structure, good dynamic response, and the ability to transmit 4-20mA electrical signals remotely, which is convenient for automatic control and centralized control. The temperature measurement principle of thermocouple is based on thermoelectric effect. When two different conductors or semiconductors are connected into a closed loop, when the temperatures at the two junctions are different, thermoelectric potential will be generated in the loop. This phenomenon is called thermoelectric effect, also known as Seebeck effect. The thermoelectric potential generated in the closed loop consists of two potentials: thermoelectric potential and contact potential. Thermoelectric potential refers to the potential generated by the two ends of the same conductor due to different temperatures. Different conductors have different electron densities, so the potentials they generate are also different. As the name implies, contact potential refers to the potential formed when two different conductors are in contact because of their different electron densities, which generates a certain amount of electron diffusion. The size of the contact potential depends on the material properties of the two different conductors and the temperature of their contact points.
Structural principle of armored thermocouple
It is made of conductor, high insulation magnesium oxide, outer 1Cr18Ni9Ti stainless steel protection tube, and is drawn in one piece multiple times. The armored thermocouple product is mainly composed of junction box, terminal block and armored thermocouple, and is equipped with various installation and fixing devices.
Armored thermocouple has many advantages such as bendability, high pressure resistance, fast thermal response time and durability. Like industrial assembled thermocouples, it is used as a sensor for measuring temperature, usually with display instruments, recording instruments and electronic regulators. At the same time, it can also be used as a temperature sensing element of assembled thermocouples. It can directly measure the temperature of liquid, steam and its gas medium and solid surface in the range of 0℃~800℃ in various production processes. Compared with assembled thermocouples, armored thermocouples have the advantages of bendability, high pressure resistance, short thermal response time and durability.
Working principle of armored thermocouple
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 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.
Features
1. It can be bent and installed for use;
2. Large measuring range;
3. Short thermal response time, reducing dynamic error;
4. High mechanical strength and good pressure resistance;
5. Simple structure, good dynamic response, easy to control automatically and centrally.
The working principle of armored thermocouple is that 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 circuit. 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 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 structural principle of the armored thermocouple is that it is made of conductor, high-insulation magnesium oxide, and outer 1Cr18Ni9Ti stainless steel protection tube, which are drawn in one piece many times.
The armored thermocouple is a sensor element for measuring temperature. It is usually used in conjunction with temperature transmitters, regulators and display instruments to form a process control system. The armored thermocouple has many advantages such as bendability, high pressure resistance, fast thermal response time and durability. Like the industrial assembled thermocouple, it is used as a sensor for measuring temperature and is usually used in conjunction with display instruments, recording instruments and electronic regulators.