A62C37/21

Dual stage fire sprinkler head and fire suppression system

Systems and methods are disclosed that include providing a dual stage fire sprinkler in a fire suppression system. The dual stage fire sprinkler includes an activation system and a dual stage sealing assembly having a primary frangible bulb and a secondary frangible bulb. The fire sprinkler activates a first stage fire suppression operation in response to an ambient temperature in a zone exceeding a trigger temperature of the primary frangible bulb. The activation system automatically replaces the primary frangible bulb with the secondary frangible bulb after a predetermined period of time and either activates a second stage fire suppression operation in response to the ambient temperature exceeding the trigger temperature of the secondary frangible bulb or resets the fire sprinkler for a subsequent fire hazard event in response to the ambient temperature being lower than the trigger temperature of the secondary frangible bulb.