Precautions for using electric heating tubes

1. The components are allowed to work under the following conditions:
A. The relative humidity of the air is not more than 95%, and there is no explosive and corrosive gas.
B. The working voltage should not be more than 1.1 times the rated value, and the shell should be effectively grounded.
C. Insulation resistance ≥1MΩ Dielectric strength: 2KV/1min.
2. The electric heating tube should be positioned and fixed, and the effective heating area must be completely immersed in liquid or metal solid. It is strictly forbidden to burn it empty. When scale or carbon is found on the surface of the tube, it should be cleaned and used in time to avoid affecting heat dissipation and shortening the service life.
3. When heating fusible metals or solid nitrates, alkalis, asphalt, paraffin, etc., the voltage should be lowered first, and the rated voltage can be raised after the medium is melted.
4. When heating air, the components should be arranged crosswise and evenly to provide good heat dissipation conditions for the components and to allow the air flowing through to be fully heated.
5. When heating nitrates, safety measures should be considered to prevent explosion accidents.
6. 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 and heating load of the wiring part for a long time, and excessive force should be avoided when tightening the wiring screws.
7. The components should be stored in a dry place. If the insulation resistance is lower than 1MΩ due to long-term storage, they can be dried in an oven at about 200℃, or the voltage can be reduced and heated until the insulation resistance is restored.
8. The magnesium oxide powder at the outlet of the electric heating tube should be protected from pollutants and moisture in the place of use to prevent leakage accidents.