WFDNF Series

Waterflow Detector

The new WFDNF 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.

The WFDNFS with glue-in tee adapter fits 1”, 1¼”, 1½”, and 2”

CPVC tees manufactured by Tyco, Spears, NIBBCO, and IPEX.

The WFDNFT with a threaded tee adapter fits 1”, 1¼”, 1½”, and 2”

brass and copper threaded tees, in addition to 1” and 1½” CPVC

tees. Clearly marked plastic paddles are included to fit the different

installation configurations.

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 an layout designed to make wiring easy. The wire-ready COM

terminals are on a different elevation with a large barrier between

switches and easy-to-read, raised, textured lettering. An optional

cover tamper switch securely snaps into place, no tools required.

The WFDNFS and WFDNFT incorporate a mechanical time delay

feature that minimizes the risk of false alarms due to pressure

surges or air trapped in the fire sprinkler system. The large 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: the largest tab is located on the dial position

for approximately 60 seconds and a notch in the dial indicates

approximately 30 seconds, making the detector easy to set in dimly

lit locations.

The WFDNF series is designed for accuracy and repeatability.

Detectors also offer improved performance during vibration in riser

applications where detectors are exposed to a large in-rush of water.

Agency Listings

System Sensor WFDNFS and WFDNFT waterflow detectors

are designed for primary signaling in systems that use

CPVC fittings.

Features

• WFDNFS has a glue-in adapter for connection to 1”, 1¼”, 1½”

and 2” CPVC tees

• WFDNFT has a NPT threaded adapter for connection to 1”, 1¼”,

1½” and 2” metal tees and 1” and 1½” CPVC tees

• Directional cover allows installers and inspectors to

easily see the direction of flow

• UL-listed models are NEMA 4 / IP 54 rated

• Cover is lightweight, unpainted 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

• Wire-ready terminals

• Improved wiring with new terminal block layout

• Snap-in optional cover tamper switch

S739