System Sensor WFD30N 3″ Fire Sprinkler Water Flow Switch – UL/FM, NEMA 4, 450 PSI

WFD30N 3″ Fire Sprinkler Water Flow Switch – UL/FM Listed

The System Sensor WFD30N is a 3 inch vane-type water flow switch engineered to detect water movement in wet-pipe fire sprinkler systems. Designed for high performance and reliability, it is UL Listed, FM Approved, and features a weather-resistant NEMA 4 enclosure suitable for indoor and outdoor installations.

Top Features:

• For 3″ Schedule 7–40 steel pipe
• UL Listed and FM Approved
• 450 PSI maximum pressure rating
• Adjustable pneumatic delay (0–90 seconds)
• Dual SPDT contacts – 10 A @ 125/250 VAC
• Weatherproof NEMA 4 enclosure with tamper resistance
• Audible alarm (73 dBA) and visual switch activation indicator
• Vertical or horizontal pipe mounting

Common Applications:

• Wet pipe fire sprinkler systems
• Commercial riser rooms and pump houses
• High-pressure water monitoring

Specifications:

• Operating Temperature: 32°F to 150°F (0°C to 66°C)
• Flow Activation: 4–10 GPM
• Conduit Openings: Two 1/2″ NPT (one open, one knock-out)
• Replaceable switch and timer assembly

Note: Ideal for rugged fire system installations. Delay mechanism helps reduce false alarms from pressure surges.