WFDN Series

Waterflow Detector

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 waterflow 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 dimmly 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.

Agency Listings

The System Sensor WFDN series is compatible with

schedule 7 through 40 steel pipe, for sizes 2 in. through

4 in. and compatible with schedule 10 through 40 steel

pipe, sizes 5 in. through 8 in., and can be mounted in a

vertical or horizontal position.

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

3051266

7770-1653:0231

S739