The quality of the heating element mainly depends on the following aspects: insulation, leakage current, electrical strength, corrosion resistance, power accuracy, and lifespan.
1. Insulation: the main factor affecting the insulation of the heating element is the sealing process. Factories can generally achieve insulation 1,000 megohms.
2. Leakage Current: It is mainly related to the temperature of the heating element, the voltage and the heating length . It is an important assessment indicator for high-temperature electric heating tubes.
3. Electrical resistance strength: The factors influencing the electrical resistance strength mainly include the thickness of the insulation layer, the quality of the insulation material, the length of the heating tube, the bending radius and the number of bends.
4. Corrosion resistance is a common problem for hot water heating element,In addition to choosing the right materials, it is also related to the heat treatment of the heating tube and the surface condition of the heating tube.
5. Power accuracy: It is mainly related to the quality of the resistance wire and the manufacturing process. Before production, factory needs to conduct a temperature coefficient test to determine the cold resistance within the qualified power range.
6. Lifespan: The lifespan of the heating tube is not only related to the quality of the resistance wire, but also to the quality of the magnesium oxide powder and the selection of the diameter of the resistance wire. For high-temperature heating tubes,when choosing the diameter of the resistance wire, it is necessary to calculate the surface load of the resistance wire to meet the lifespan requirements.
