(1) The relative humidity of the air is not more than 95% without explosive and corrosive gases. (except explosion-proof electric heaters)
(2) The working voltage should not be greater than 1.1 times the rated value. The enclosure should be effectively grounded.
(3) Insulation resistance ≥ 1MΩ Dielectric strength: 2KV/1min.
(4) The electric heating pipe should be positioned and fixed, and the effective heating zone must be completely immersed in liquid or metal solid. It is found that when there is scale or carbon on the surface of the pipe body, it should be cleaned up in time to avoid heat dissipation and shorten the service life.
(5) When heating fusible metal or solid nitrate salt, alkali, bitumen, paraffin, etc., the voltage should be lowered first until the medium is melted before it can rise to the rated voltage.
(6) When the air is heated, the components should be evenly arranged to make the components have good heat dissipation conditions so that the flowing air can be heated sufficiently.
(7) Safety measures should be taken to prevent explosion accidents when heating nitrate.
(8) The wiring part should be placed outside the insulation layer to avoid contact with corrosive, explosive media and moisture; the lead wire should be able to withstand the temperature of the wiring part for a long time and the heating load should be avoided when the terminal screws are tightened.
(9) The components should be stored in a dry place. If the insulation resistance is less than 1MΩ for a long time, it can be dried in an oven of about 200 °C or the voltage is reduced and the insulation resistance is restored. 8. The magnesium oxide powder at the outlet end of the electric heating tube is protected from the infiltration of pollutants and moisture in the place of use.
Prevent the occurrence of electric leakage accidents.