- Brand: Changdian
- Model: 8-inch bell
This connection to the fire alarm bell 8 inch hit formula
Second, the normal working conditions:
1. not more than 2000 meters above sea level
2. The ambient medium humidity no higher than +40 degrees and no less than --25 degrees air relative humidity less than 90% (when the temperature is + 25 degrees)
3. No ambient air flammable and corrosive gas or conductive dust and no significant shake and shock vibration environments.
4. able to work properly when the rated voltage ± 10%, no more than 10 minutes continuously.
5. Pollution levels for 2, installation category II class