How often should low air pressure alarms in pre action systems be tested?

• A. Monthly
• B. Quarterly
• C. Semi annually
• D. Annually

Answer: (B)

Maintaining an adequate air supply in a pre-action (dry-pipe) system is essential because the air holds back the water-filled piping until a sprinkler event occurs. The low air pressure alarm is there to warn when the air charge drops, so you can fix leaks or a failing compressor before water can be released unintentionally. Testing this alarm on a quarterly basis provides timely detection of developing issues (like leaks, regulator drift, or compressor problems) without overly burdening maintenance schedules. This frequency balances reliability with practical upkeep, keeping the system ready to operate as designed. During the test, verify that the alarm activates at the intended low-pressure setpoint, that the audible/visual notification works, and that the signaling properly trips and resets after restoring the air pressure.