How to prevent leakage of electric heaters
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Quality issues with electric heaters and improper user operation can lead to leakage accidents. How can we prevent these? Here are some tips:
1. Electric heating elements are permitted to operate under the following conditions:
a. The relative humidity of the air must not exceed 95%, and there must be no explosive or corrosive gases.
b. The operating voltage must not exceed 1.1 times the rated value, and the housing must be effectively grounded.
c. The insulation resistance must be ≥ 1mΩ, and the dielectric strength must be 2kV/min.
2. The electric heating element must be fixed securely, with the active heating area completely immersed in liquid or solid metal. Venting the element is strictly prohibited. If scale or carbon is found on the surface of the element, it must be cleaned and reused promptly to avoid affecting heat dissipation and shortening its service life.
3. When heating air, components should be evenly arranged in a cross pattern to ensure good heat dissipation and sufficient heating of the air flowing through them.
4. When heating fusible metals or solid salts, alkalis, leaching agents, paraffin wax, etc., the service voltage should be reduced first and raised to the rated voltage only after the medium has melted.
5. Safety measures should be taken when heating saltpeter to prevent explosions.
6. Wiring components should be placed outside the insulation to avoid contact with corrosive, explosive media, and moisture. The wires should be able to withstand the temperature and thermal loads of the wire connections over time, and excessive force should be avoided when tightening the wire connection screws.
7. These components should be stored in a dry place. If the insulation resistance drops below 1Ω due to long-term storage, they can be dried in an oven at approximately 200°C or heated at reduced voltage until the insulation resistance recovers.
8. The magnesium oxide powder at the outlet of the electric heating tube should be protected from contaminants and moisture at the location of use to prevent leakage.
