Introduction to armored thermocouple classification

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 gaseous media and solid surfaces in the range of 0-1800℃ in various production processes. Armored thermocouples have many advantages such as bending, high pressure resistance, fast thermal response time and durability. Like industrial assembled thermocouples, they are usually used in conjunction with display instruments, recording instruments and electronic regulators as temperature measurement sensors.
Armored thermocouples are two conductors of different components that are welded at both ends to form a loop. The direct temperature measurement 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. The structural principle of armored thermocouple is that it is made of conductor, high insulation magnesium oxide, and outer sheath 1Cr18Ni9Ti stainless steel protection tube, which are drawn one by one 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.