Which statement best describes how a sprinkler head alarm functions within a fire alarm system?

• A. Sprinkler head alarms only trigger local audible signals.
• B. Sprinkler head alarms are not used in modern systems.
• C. When a sprinkler head is activated, its alarm signal is sent to the fire alarm control panel to initiate alarms and notifications.
• D. When a sprinkler head is activated, its alarm signal is not transmitted to the fire alarm control panel.

Answer: (C)

Sprinkler head alarms are designed to alert the whole fire alarm system, not just the area around the sprinkler. When a sprinkler head is activated by heat, water flow is detected by a flow switch or by an integrated alarm switch in the head. This detection sends a signal to the fire alarm control panel, which then initiates the building’s alarms and notifications, updates the panel’s status, and can trigger annunciation and notifications to occupants and responders. This coordinated response is why the alarm signal is transmitted to the control panel—it ensures the entire building responds, not just a local horn at the sprinkler. Modern systems rely on that panel-driven alert rather than relying solely on local audible signals, and sprinkler head alarms are still a common feature today.