Field Instruments

General

The new WFDN Series waterflow detectors from System Sensor consists of a rugged, NEMA 4-rated enclosure that is more damage resistant than previous metal designs. The waterflow detector is designed for both indoor and outdoor use, with the widest available temperature range, from 32°F to 150°F. They are also approved for installation on the widest range of pipe schedules, sizes 2 in. through 4 in. are approved for installation on pipe schedules 7 through 40.

UL-listed models are equipped with tamper-resistant cover screws to prevent unauthorized entry. Inside, two sets of SPDT (Form C) synchronized switches are enclosed in a durable terminal block with new layout designed to make wiring easy with wire ready terminals, COM terminals are on a different elevation, large barrier between switches and easy to read raised textured lettering all make wiring easy. An optional cover tamper switch is available, securely snaps into place, no tools required.

The WFDN series incorporates a mechanical time delay feature, which minimizes the risk of false alarm due to pressure surges or air trapped in the fire sprinkler system. The larger and easy to turn timer dial makes setting the water flow detector easy with high contrast pad printed markings. The dial offers three tabs to help with turning, with one larger tab located on the dial position for approximately 60 seconds, a notch is also indicated on the dial to locate approximately 30 seconds making setting the detector in dimly lit locations easy.

The WFDN series is designed for accuracy and repeatability. The detector also offers improved performance during vibration in riser applications where detectors are exposed to a large in rush of water.

Features:

• New directional cover allows installers and inspectors to easily see the direction of flow
• UL-listed models are NEMA 4 rated
• New cover provides a better seal, is lighter weight, not painted and corrosion resistant
• Sealed retard mechanism immune to dust and other contaminants
• Less exposed metal reduces shock hazard, plastic cover acts as insulator and is resistant to arcing
• Visual switch activation
• Audible switch activation (73 dBA)
• Field-replaceable timer/switch assembly
• Accommodates up to 12 AWG wire
• Switch Synchronization activates both alarm panel and local bell or horn strobe
• Tamper-resistant cover screws
• Improved water sealing
• Reduced product weight
• Wire-ready terminals
• Improved wiring with new terminal block layout
• Snap-in optional cover tamper switch
• Improved timer repeatability and accuracy

Specifications

• Make : System Sensor  
• Model: WFD20N
• Static Pressure Rating: 450 PSI
• Operating Temperature Range: 32°F to 150°F (0°C to 66°C)
• Maximum Surge: 18 Feet Per Second (FPS)
• Enclosure Rating*: NEMA 4 – suitable for indoor/outdoor use
• Triggering Threshold/ Bandwidth (Flow Rate): 4–10 GPM
• Cover Tamper Switch:  Standard with ULC models, optional for UL models, part no. CTS
• Conduit Entrances: Two openings for ½ in. conduit. NEMA 4 rated plugs
• Service Use: Automatic Sprinkler: NFPA-13 , One or Two Family Dwelling: NFPA 13D, Residential Occupancies up to 4 Stories, NFPA 13R National Fire Alarm Code: NFPA-72
• Contact Ratings: Two sets of SPDT (Form C) , 10.0 A, ½ HP @ 125/250 VAC, 2.5 A @ 6/12/24 VDC
• Compatible Pipe:  Steel water pipe, schedule 7 through 40

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