What is the function of sprinkler waterflow and pressure switches, and how do they interface with the fire alarm control panel?

• A. Waterflow switches detect water movement; pressure switches monitor system pressure; both provide signals to the control panel to initiate alarms and maintenance indications.
• B. Waterflow switches measure water temperature; pressure switches control water temperature.
• C. They are cosmetic devices that do nothing.
• D. They exclusively trigger the sprinkler heads without signaling the panel.

Answer: (A)

Waterflow and pressure switches serve to detect actual activity in the sprinkler system and to report that activity to the fire alarm control panel. A waterflow switch senses movement of water in the piping when a sprinkler head has released and water starts to flow. A pressure switch monitors the hydraulic pressure within the system and detects changes that occur when valves open, a head operates, or there’s a leak or other fault. When either switch detects its condition, it sends a signal to the fire alarm control panel, which then initiates alarms, displays the appropriate status, and may trigger maintenance or supervisory indications.

This signaling is essential for coordinated response. The switches don’t measure temperature or control it, they’re not cosmetic devices, and they don’t simply trigger sprinkler heads without informing the panel. Their job is to provide the panel with real-time status so the system can alert occupants and responders appropriately.