System Sensor WFD25N 2-1/2″ Fire Sprinkler Water Flow Switch – UL/FM, NEMA 4, 450 PSI

WFD25N 2-1/2″ Fire Sprinkler Water Flow Switch – UL/FM Listed

The System Sensor WFD25N is a 2-1/2 inch vane-type water flow switch designed to detect water movement in wet fire sprinkler systems. It’s UL Listed, FM Approved, and built for both indoor and outdoor use, thanks to its weatherproof NEMA 4 enclosure.

Top Features:

• For 2-1/2″ Schedule 7–40 steel pipe
• UL & FM approved for fire sprinkler systems
• 450 PSI pressure rating – ideal for high-demand systems
• 0–90 second pneumatic delay reduces false alarms
• Dual SPDT contacts (10 A @ 125/250 VAC)
• Built-in tamper-resistant cover and audible activation
• Works in vertical or horizontal pipe runs

Applications:

• Wet pipe fire sprinkler systems
• Commercial buildings and riser rooms
• Indoor/outdoor installations (NEMA 4 rated)

Specifications:

• Operating Temp: 32°F–150°F (0°C–66°C)
• Activation Flow: 4–10 GPM
• Two 1/2″ conduit openings (one open, one knock-out)
• Field-replaceable timer and switch assembly

Note: Can mount vertically or horizontally. Use delay setting to minimize nuisance alarms.