According to the design requirements of instrument insulation, generally speaking, the temperature of the medium in the instrument pipeline should be between 20-80 degrees, and the temperature in the instrument insulation box is more suitable to be maintained between 15--20 degrees. In order to compensate the heat dissipated and lost by the instrument pipelines and containers and the instrument insulation box, thermal insulation tracing measures need to be taken. At present, there are mainly two kinds of heat tracing measures, one is traditional steam and hot water heat tracing. The other is electric heat tracing. In recent years, with the maturity of electric heat tracing technology and its unique advantages, it will gradually become a new generation of heat insulation method that replaces steam and hot water heat tracing. The steam heat tracing of the instrument insulation box is mainly composed of a box body, a lined insulation material, a transmitter bracket, and a U-shaped steam radiator. In order to facilitate daily maintenance, there are standing observation windows on the door of the box, and the top of the box can be provided with an opening for inserting bimetal temperature measurement without parts. The electric heat tracing of the instrument insulation box generally uses electric heating pipes, while the electric heating of the instrument pipelines uses electric heating belts. The electric heating pipe is a seamless steel pipe as the shell, which is equipped with a resistance wire and filled with magnesium oxide powder. High suburban rate, energy saving, simple design, convenient construction and installation, no pollution, long service life, can realize the advantages of remote control and automatic control. It is the technology development direction to replace steam and hot water heating. Has been widely used in industrial and mining enterprises in various industries.