T-Tap Waterflow Detector
T-Tap Waterflow Detector
Sealed retard mechanism (Model WFDT) assures that the retard is not contaminated by dust and dirt when the cover is removed
Visual Switch Activation (Model WFDT) permits installer to accurately set the retard even under extremely noisy conditions
100% Synchronization activates both alarm panel and local bell simultaneously
Accommodates up to 12 AWG wire
System Sensor WFDT Retard and WFDTNR Non-Retard T-Tap Waterflow Detectors are designed for primary signaling in residential systems and branch line signaling in larger systems. Both models fit any tee that has a 1″ NPT branch, including: 1″, 11⁄4″ and 11⁄2″ NPT threaded ferrous and brass tees; 1″, 11⁄4″, 11⁄2″ and 2″ copper sweat tees; Central, Spears®, and Victaulic® brand 1″ CPVC tees; and 11⁄2″ polybutylene tees.
Design. The design of the WFDT and WFDTNR makes them easy to install and simple to maintain. Either can be mounted in the vertical or horizontal position. Two conduit openings permit easy attachment to the local alarm system. The retard mechanism (Model WFDT only) and switch assemblies are fieldreplaceable.
Features. Nine different flexible plastic paddles fit 1″, 11⁄4″, 11⁄2″ and 2″ tees. Sizes are marked clearly on the paddle for ease of installation. Plastic paddles slip over the actuating lever and are securely fastened with one screw. The handy depth gauge insures the proper installation depth and clearance of the detector to the tee.
Construction. The WFDT and WFDTNR include a durable tamper resistant enclosure and rugged switch assembly. The long lasting covers completely enclose the electrical components to keep out dust and dirt. Improved self-guiding security screws and removal tools make detectors resistant to tampering and simplify field maintenance. Dual SPDT switches are enclosed in a durable terminal block for added strength.
|Static Pressure Rating||
|Triggering Threshold Bandwidth
4 – 10 GPM
|Compatible Tee Fittings||
Threaded ferrous and brass tees, copper sweat tees, CPVC tees, and polybutylene tees
Two sets of SPDT (Form C)
10.0 A @ 125/250 VAC
2.5 A @ 24 VDC
|Overall Dimensions, Installed||
WFDT: 4.5″ H x 3.75″ W x 6.7″ L
(11.4cm H x 9.5cm W x 17cm L)
WFDTNR: 3.75″ H x 3.25″ W x 4.25″ L
(9.5cm H x 8.2cm x W x 10.8cm L)
2 openings for 1⁄2″ conduit
|Operating Temperature Range||
32°F – 120°F (0°C – 49°C)
UL Indoor/Outdoor Rated
WFDT: 2.6 lbs. (1.2 kg.)
WFDTNR: 1.5 lbs. (0.7 kg.)
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
|U.S. Patent Numbers||
3,845,259; 4,782,333; 5,213,205
Model shall be a WFDT or WFDTNR as manufactured by System Sensor. T-tap water flow detectors shall be installed on a tee that has a 1″ NPT branch including: 1″, 11⁄4″ , or 11⁄2″ threaded ferrous or brass tee; 1–2″ copper sweat tees; Central, Spears®, and Victaulic® brand 1″ CPVC tees; or 11⁄2″ polybutylene tee as designated on the drawings and/or as specified herein. Detectors shall mount on any clear pipe span of the appropriate size, either a ver tical or horizontal run at least 6″ from any fittings or valves which may change water direction, flow rate, or pipe diameter or no closer than 24″ from a valve or drain. Detectors shall have a sensitivity in the range of 4 to 10 gallons per minute and a static pressure rating of 250 psi. The retard t-tap detector shall be a sealed mechanical pneumatic unit with visual indication of actuation. The actuation mechanism shall include a polyethylene vane inserted through the tee fitting and connected by a mechanical linkage to the delay mechanism. The non-retard t-tap detector shall respond with no time delay to waterflow in the specified direction and range. Outputs shall consist of dual SPDT switches (Form C contacts). Two conduit entrances (one of which is a knockout type) for standard fittings of commonly used electrical conduit shall be provided on the detectors. A grounding provision is provided. All detectors shall be listed by Underwriters Laboratories for indoor or outdoor use.
Common and B connections will close when vane is deflected, i.e., when water is flowing. Dual switches permit applications to be combined on a single detector.
|125/250 VAC||10 AMPS|
|24 VDC||2.5 AMPS|
Break wire as shown for supervision of connection. Do not allow stripped wire leads to extend beyond switch housing. Do Not loop wires.
Click image above for a detailed view of this product
Waterflow Detector, Fits 1″, 11⁄4″, 11⁄2″ ferrous and brass threaded tees;
1″, 11⁄4″, 11⁄2″, 2″ copper sweat tees; 1″ CPVC tees;and 11⁄2″ polybutylene tees
Waterflow Detector, non-retard, fits same tees as Model WFDT
Replacement Terminal Block for WFDT
Replacement Terminal Block for WFDTNR
Replacement Retard Mechanism
Replacement Paddle Kit — 11 paddles for WFDT and WFDTNR (see WFDT for sizes)
Cover Tamper Switch Kit for WFDT
Replacement Tamper Screws for Covers of WFDT, WFDTNR
Replacement Tamper Proof Wrench for Cover of WFDT, WFDTNR
NEMA-4 Gasket Kit
Replacement Metal Cover
|WFDT||Waterflow Detector||A77-01-02||Terminal Block for WFDT|
|A77-01-08||Terminal Block for WFDTNR|
|546-7000||Cover Tamper Switch Kit|
|S07-66-02||Tamper Screws for Cover|
|WFDN4||NEMA-4 Gasket Kit|
Globe agrees to repair or replace any of its own manufactured products found to be defective in material or workmanship for a period of one year from date of shipment.
For specific details of our warranty please refer to Price List Terms and Conditions of Sale (Our Price List).
Last Revised: March 2002