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Valves & Accessories » System Sensor

T-Tap Waterflow Detector

T-Tap Waterflow Detector

Product Overview

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.

Specifications

General Specifications
Static Pressure Rating	250 PSI
Triggering Threshold Bandwidth (Flow Rate)	4 – 10 GPM
Maximum Surge	18 FPS
Compatible Tee Fittings	Threaded ferrous and brass tees, copper sweat tees, CPVC tees, and polybutylene tees
Contact Ratings	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)
Conduit Entrances	2 openings for 1⁄2″ conduit
Operating Temperature Range	32°F – 120°F (0°C – 49°C)
Enclosure Rating	UL Indoor/Outdoor Rated
Shipping Weight	WFDT: 2.6 lbs. (1.2 kg.) WFDTNR: 1.5 lbs. (0.7 kg.)
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
Warranty	3 years
U.S. Patent Numbers	3,845,259; 4,782,333; 5,213,205

Engineering Specifications

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.

Cross Section

Electrical Connections for WFDT
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.

Contact Ratings
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.

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Ordering Information

Part Number	Description
WFDT	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
WFDTNR	Waterflow Detector, non-retard, fits same tees as Model WFDT
A77-01-02	Replacement Terminal Block for WFDT
A77-01-08	Replacement Terminal Block for WFDTNR
A3008-00	Replacement Retard Mechanism
PRK9	Replacement Paddle Kit — 11 paddles for WFDT and WFDTNR (see WFDT for sizes)
546-7000	Cover Tamper Switch Kit for WFDT
S07-66-02	Replacement Tamper Screws for Covers of WFDT, WFDTNR
WFDW	Replacement Tamper Proof Wrench for Cover of WFDT, WFDTNR
WFDN4	NEMA-4 Gasket Kit
C58-164-01	Replacement Metal Cover

Models Available			Replacement Parts
WFDT	Waterflow Detector		A77-01-02	Terminal Block for WFDT
WFDTA	Waterflow Detector (ULC/Canadian)		A77-01-08	Terminal Block for WFDTNR
WFDTNR	Waterflow Detector (non-retard)		A3008-00	Retard Mechanism
			PRK9	Paddle Kit
			546-7000	Cover Tamper Switch Kit
			S07-66-02	Tamper Screws for Cover
			WFDW	Cover Wrench
			WFDN4	NEMA-4 Gasket Kit
			C58-164-01	Metal Cover

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