System Sensor WFD25 | Waterflow Detector for 2½” Steel Sprinkler Pipe | NEMA 4 Rated – UL/FM Approved

The System Sensor WFD25 Waterflow Detector is engineered to provide dependable waterflow supervision for 2½-inch wet pipe fire sprinkler systems. Designed for commercial and industrial fire protection applications, the WFD25 incorporates a rugged NEMA 4 enclosure, adjustable pneumatic retard mechanism, and dual synchronized SPDT contacts to provide reliable fire alarm activation while minimizing nuisance alarms caused by pressure fluctuations.

The WFD25 mounts directly to 2½-inch Schedule 7 through Schedule 40 steel sprinkler pipe and is suitable for indoor or outdoor installations. Featuring wire-ready terminals, audible and visual switch activation, corrosion-resistant construction, and field-replaceable timer components, it provides long-term performance while meeting NFPA installation requirements.

Technical Specifications

• Manufacturer: System Sensor
• Model: WFD25
• Pipe Size: 2½”
• Pipe Schedule: Schedule 7–40
• Hole Size: 1¼”
• Pressure Rating: 450 PSI
• Flow Threshold: 4–10 GPM
• Operating Temperature: 32°F–150°F
• Enclosure: NEMA 4
• Contacts: Two SPDT
• Approvals: UL, ULC, FM
• Warranty: 3 Years

Key Features

• Designed for 2½” steel sprinkler pipe
• Vane-type waterflow detector
• NEMA 4 enclosure
• Indoor & outdoor rated
• Adjustable pneumatic retard
• Dual SPDT contacts
• Visual & audible activation
• Wire-ready terminals
• Corrosion-resistant housing
• Tamper-resistant cover
• Two ½” conduit entrances
• UL Listed
• ULC Listed
• FM Approved
• 3-Year Warranty

Applications

• Commercial Buildings
• Industrial Facilities
• Warehouses
• Schools
• Hospitals
• Hotels
• Wet Pipe Fire Sprinkler Systems