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How to judge the quality of resistance heaters

First, the power accuracy: mainly related to the quality of the resistance wire, the level of technology of the manufacturing plant. Generally in the batch before production are required to do the test of temperature coefficient to determine the qualified power range of cold state resistance.

Second, the electrical strength: the factors that affect the electrical strength of the electric heaters mainly include the thickness of the insulation layer, the quality of the raw materials of the insulation layer, the length of the electric heaters, the radius of the bend and the number of R parts of the bend. Now in the cold state voltage resistance of electric heaters are generally required to reach 2000V / 1s breakdown current 0.5mA.

Third, insulation: the main impact of the insulation of the electric heaters is the sealing process of the electric heaters. General high-temperature powder sealing at least 104 MΩ, medium-temperature magnesium powder and low-temperature magnesium powder or modified powder to reach 103 MΩ.

Fourth, the leakage current: mainly with the use of electric heating tube temperature, the use of electric heating tube voltage, the heating length of the electric heating tube and the quality of magnesium powder is good or bad. This is also an important assessment indicator of the high temperature electric heaters.

Fifth, the service life: the life of the electric heating tube in addition to the quality of resistance wire, but also with the quality of magnesium oxide (and the choice of tube material related), the choice of resistance wire diameter and other factors. For air heating with the manufacture of electric heating tube surface load control within 8W/cm2. In the selection of the diameter of the resistance wire, the surface load of the resistance wire needs to be calculated to achieve the life requirements.

Sixth, corrosion resistance: is the water heating electric heaters and empty dry fever electric heaters often encountered problems. In addition to a reasonable choice (tube) material, but also with the heat treatment of the electric heaters, the surface state of the electric heaters and other related.

Seven, the appearance of the size: in line with the customer's assembly requirements, reflecting the factory technology, manufacturing, tooling to ensure the ability of good or bad, while the appearance can also reflect the grade and manufacturing level of the product. The heaters produced by our company are in compliance with CE and RoHS certification.