5 methods for testing the quality of electric heating tubes

1, electrical strength test
At the electrical strength of the cold state and the electrical strength of the operating temperature, the high-quality product should be able to withstand 50hz, one minute of pressure. After cutting off the current 5ma, no breakdown, flashover phenomenon.


2. Overload experiment
Under the condition of full heat release, power on for 1.5 hours at 1.27 times the rated power, power off cooling and repeat this operation 30 times to see if there is damage to the heating tube.


3, leakage current experiment
The heating tube is placed under the condition of full heating, and the voltage is 1.15 times. If the leakage current is less than 0.5MA, it is a high-quality electric heating tube.


4, seal test

This sealing test is mainly carried out for the shell of the electric heater, the heating tube is placed in acidified water, and then the two ends of the electric tube are exposed to see whether the performance requirements have met the requirements of items 1 and 3.



5. Test the sealing device
The main performance requirements are the same as the fourth item, except that the experimental conditions are different, and the experimental conditions are to put the electric heating tube in an environment with a temperature of 60 degrees Celsius and a humidity of 95% for one day.

When Linzhi single head heating pipe is shipped, a series of sampling tests are carried out on the heating pipe in accordance with international standards to ensure the quality of the finished product.