1. The immersion heater is allowed to work under the following conditions:
A. The relative humidity of the air is no more than 95%, and there is no explosive and corrosive gas. (Except explosion-proof heaters)
b. The working voltage should not be greater than 1.1 times of the rated value, and the casing should be effectively grounded.
c. Insulation resistance≥1MΩ Dielectric strength: 2KV/1min.
2. The electric heating tube should be well positioned and fixed. The effective heating area must be completely immersed in liquid or metal solid, and empty burning is strictly prohibited.
3. When heating fusible metals or solid nitrates, alkalis, bitumen, paraffin, etc., the operating voltage should be reduced first, and the rated voltage can only be increased after the medium is melted.
4. When heating the air, the elements should be evenly arranged in a cross, so that the heating tube has good heat dissipation conditions, so that the air flowing through can be fully heated.
5. Safety measures should be considered when heating nitrate 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 heating tube should be stored in a dry place. If the insulation resistance is lower than 1MΩ due to long-term storage, it can be dried in an oven at about 200 °C.
