System Sensor WFD50N 5″ Fire Sprinkler Water Flow Switch – UL/FM, NEMA 4, 450 PSI

WFD50N 5″ Fire Sprinkler Water Flow Switch – UL/FM Listed

The System Sensor WFD50N is a heavy-duty 5 inch vane-type water flow switch designed for use in wet-pipe fire sprinkler systems. With a durable NEMA 4 enclosure, high pressure capacity, and field-replaceable components, it delivers long-lasting performance for commercial and industrial applications. UL Listed and FM Approved.

Top Features:

• Designed for 5″ Schedule 7–40 steel pipe
• UL Listed and FM Approved for fire protection use
• 450 PSI maximum working pressure
• Adjustable pneumatic retard (0–90 seconds)
• Dual SPDT contacts – 10 A @ 125/250 VAC
• Weatherproof NEMA 4 enclosure for indoor/outdoor use
• Audible and visual activation indicators
• Field-serviceable timer and switch module

Applications:

• Wet fire sprinkler systems in large facilities
• Fire risers and main water supply monitoring
• Industrial, municipal, and commercial fire systems

Specifications:

• Operating Temperature: 32°F to 150°F (0°C to 66°C)
• Flow Activation: 4–10 GPM
• Conduit Entries: Two 1/2″ NPT (one open, one knock-out)
• Mounting: Vertical or horizontal orientation

Installation Tip: Use the adjustable delay to avoid false alarms caused by water surges or hammering. Follow NFPA standards for best results.