A sprinkler waterflow device must initiate an alarm signal at the control unit within how many seconds of water flow?

A sprinkler waterflow device must initiate an alarm signal at the control unit within how many seconds of water flow?

• A. 60 seconds
• B. 90 seconds
• C. 120 seconds
• D. 180 seconds

Answer: (B)

Waterflow devices trigger the fire alarm when water movement is detected in the sprinkler piping, and that signal must reach the control unit quickly to notify occupants and responders without unnecessary delay. The standard time allowed from flow detection to alarm initiation is 90 seconds. This keeps notification fast enough to support prompt evacuation and emergency response, while avoiding alarms from brief, non-discharge water movement. If the interval were shorter, nuisance alarms could occur from minor fluctuations; if longer, there would be unnecessary delay in alerting people and authorities.

Waterflow devices trigger the fire alarm when water movement is detected in the sprinkler piping, and that signal must reach the control unit quickly to notify occupants and responders without unnecessary delay. The standard time allowed from flow detection to alarm initiation is 90 seconds. This keeps notification fast enough to support prompt evacuation and emergency response, while avoiding alarms from brief, non-discharge water movement. If the interval were shorter, nuisance alarms could occur from minor fluctuations; if longer, there would be unnecessary delay in alerting people and authorities.