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fire alarm system >> system sensors >>  water  flow detector

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The System Sensor WFD

Series vane-type water flow detector, with a computer designed paddle, fits Schedule 10through Schedule 40 steel pipe sizes 2 through 8 . The design of this unit makes it easy to install and simple to maintain. It can be mounted in a vertical or horizontal position and is suitable for indoor and UL-listed outdoor wit-pipe sprinkler installations. Switch assembly and delay mechanism assembly are field replaceable. Advanced features include:

Sealed Retard

Assures that the adjustable retard is not contaminated by dust and dirt when the cover is removed.

Visual Switch Activation

Permits installer to accurately set the retard even under extremely noisy conditions

Mechanical Delay Adjustment

The pneumatic delay is preset at dial setting 2 in the factory. To adjust the delay, move the adjustment dial to the desired number.

Rugged Switch Assembly

Switches are enclosed in a durable terminal block for added strength. Accommodates up to 12 AWG wire.

100% Synchronization

Activates both alarm panel and local bell at the same time.

Durable Tamper Resistant Enclosure

Red epoxy painted metal cover completely encloses the electrical components to keep out dust and dirt. Improved self-guiding security screws and removal tool make detector resistant to tampering; wiring diagram inside cover simplifies field maintenance.

Engineer Architect Specifications:

Vane-type water flow detectors shall be installed on system piping as designated on the drawings and/or as specified herein. Detectors shall mount on any clear pipe span of the appropriate0 nominal size, either a vertical up flow or horizontal run, at least 6 from any fittings 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 for 2 -8 pipes. The detector shall respond to water flow in the specified direction after a preset time delay which is field adjustable.

 Specifications

Static Pressure Rating 250 PSI (Max.)
Triggering Threshold
Bandwidth (Flow Rate
4-10 GPM
Maximum Surg 18 FPS

Compatible Pipe

Steel water pipe, schedule
10 through 40

Contact Ratings Two sets of S.P.D.T. (Form C)10.0 A @ 125/250 VAC 2.5 A@ 24 VDC
Overall Dimensions See figure on back
Conduit Entrances Two openings for 1/2 conduit
Operating Temperature Range 32 to 120 (0 to 49 )

Sizes Available

For schedules 10 through 40,
sizes 2 through 8

Cover Tamper Switch

Optional model 546-7000

Shipping Weight

Varies,3-7 lbs., according to size

Automatic Sprinkler NFPA 13D
One or Two Family Dwelling NFPA 13
Residential Occupancies up to 4 Stories NFPA 13R
National Fire Alarm Code NFPA 72
Warranty 3 years

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