Testing standards for electric tubular heater
1. Power input test: Power on at rated voltage.
2. Electrical strength test:
a. Electric strength in cold state: should be able to withstand 50Hz, 1min withstand voltage, cut off current 5mA, no breakdown, flashover phenomenon.
Rated voltage Test voltage 250V 1250V
b. Electrical strength at working temperature: withstand 50Hz, 1min withstand voltage, cut off current 5mA, no breakdown, flashover phenomenon.
Rated voltage Test voltage 250V 1000V
3. Leakage current at working temperature: Under the condition of sufficient heat release, the electric heating pipe is input with 1.15 times the rated power, and the leakage current is 0.5m A.
4. Overload test: Under the condition of sufficient heat release, the electric heating tube is energized for 1hrs at 1.27 times the rated power, and it is cooled for 0.5hrs to room temperature (forced cooling is allowed). This repeats 30 cycles without damage.
5. Sealing test of electric heating element casing (tube crack test): immerse the electric heating tubular in acidified water (2% ~ 3% hydrochloric acid, sulfuric acid or nitric acid) for 3hrs. The two ends of the electric heating tubular should expose at least 5mm of the liquid surface. 2 ~ 3 performance requirements.
6. Sealing test: The electric heating tube is placed in an environment with a temperature of 60 ° C and a humidity of 95% for 24hrs. After being placed, it should meet the performance requirements of items 2 to 3.
7. Life test: The electric heating element is energized at the rated voltage for 1hrs under fully exothermic conditions, and is cooled for 0.5hrs to room temperature (forced cooling is allowed), and the cumulative working time reaches 3000hrs.