How to test and inspect the coil heating element?

How to test and inspect the coil heating element?

We all know that the coil heating element is widely used, so what are its technical requirements and factory inspection standards? Let us see the details as below.

1. Leakage current: The leakage current of the element at the working temperature and after the sealing test of the hydraulic testing machine should not exceed 0.5mA.

2. Rated power deviation: +5%/-10%.

3. Insulation test: 1000MΩ.

4. Breakdown test: 2000V/s.

5. Life test: batch inspection, the normal working life of the coil heating element is not less than 3000h under the frequency of use provided by the customer.

6. Water pressure test: components used for liquid heating and whose joints are installed below the liquid level. If flanges are welded, they should be able to withstand a water immersion pressure test of 1.2 MPa for 5 minutes, and there will be no leakage after the test. The fastening device should be able to withstand a water immersion test of 0.3 MPa for 5 minutes, and there should be no leakage after the test.