Nowadays more and more heating elements from different factories and areas are coming into market. Facing so many choices, how can customers choose heaters with better quality and longer lifespan? As a 23 years’ professional heating element manufacturer, Detai recommends you to take the following factors into account while purchasing.
1. Heat resistance
Heating element should be able to undertake 1000 times circular heat resistance test under specified test condition and test volt, and will not break.
2. Heating time
Under test volt, rising time from environment temperature to test temperature should be less than 15 minutes.
3. Rated power tolerance
If the element is sufficiently heated, the rated power tolerance should not exceed the following scope.
If rated power is less than 100w, the tolerance is ±10%.
For element with rated power more than 100w, the tolerance is +5% ~ -10% or ±10w, whichever is bigger
4. Current leakage
Under normal temperature and after test of water pressure and seal, current leakage should not exceed 0.5mA. I=1/6（tT×0.00001） I refers to current leakage(mA), t is heating length(mm) and T is working temperature(℃).
5. Insulation resistance
Under normal temperature, the resistance should be not less than 50MΩ.
6. insulation strength
The element should have no flashover and breakdown for 1 minute under specified test condition with set test volt.
7. Capability of on-off
Under test environment, heating element should pass 2000 times’ on-off test without damage occurs.
Under test condition, heater should be able to pass 30 times’ continuous overload test and will not damage.