The insulation resistance after long-term storage or use should not be lower than the calculated value in the formula compared to the thermal insulation resistance at a working temperature of M Ω

The insulation resistance after long-term storage or use should not be lower than the calculated value in the formula compared to the thermal insulation resistance at a working temperature of M Ω

1. Heating time: Under the test voltage, the time for the component to rise from ambient temperature to test temperature should not exceed 15 minutes

2. Rated power deviation: Under sufficient heating conditions, the deviation of the rated power of industrial electric heating tubes should not exceed the range specified below; ± 10% for components with a rated power of less than or equal to 100W. For components with a rated power greater than 100W, it is+5% to -10% or 10W, whichever is higher.

3 Leakage current: The cold leakage current, as well as the leakage current after water pressure and sealing tests, should not exceed 0.5mA. The hot leakage current at the working temperature of industrial electric heating pipes should not exceed the calculated value in the formula, but not exceed 5mA. I=1/6 (tT × 0.00001) I - Hot leakage current mA t - Heating length mm T - Working temperature ℃. When multiple components are connected in series to the power supply, this group of components should be used as a whole for leakage current testing.

4. Insulation resistance: During the factory inspection of industrial electric heating pipes, the cold insulation resistance should not be less than 50M Ω. After the sealing test, the insulation resistance after long-term storage or use should not be less than M Ω. The hot insulation resistance at the working temperature should not be less than the calculated value in the formula, but should not be less than 1M Ω. R="(10-0.015T)/t" × 0.001R - Hot insulation resistance M Ω t - Heating length mmT - Working temperature ℃

5. Insulation and withstand voltage strength: The component should be maintained for 1 minute under the specified test conditions and test voltage, without flashover or breakdown phenomenon

6 Ability to withstand power on and off: Components should be able to undergo 2000 power on and off tests under specified test conditions without damage

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