Engineering Specifications

Vane-type waterflow detectors shall be installed on system piping as designated on the drawing and/or as specified herein. Detectors shall

mount on any clear pipe span of the appropriate nominal size, either a vertical upflow or horizontal run, at least 6 in. from any fittings that may

change water direction, flow rate, or pipe diameter or no closer than 24 in. 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 450 psi for 2 in. – 8 in. pipes. The detector shall respond to waterflow in the specified

direction after a preset time delay that is field adjustable. The delay mechanism shall be a sealed mechanical pneumatic unit with visual and

audible indication of actuation. The actuation mechanism shall include a ethylene vinyl acetate vane inserted through a hole in the pipe and

connected by a mechanical linkage to the delay mechanism. Outputs shall consist of dual SPDT switches (Form C contacts). Two conduit

entrances for standard fittings of commonly used electrical conduit shall be provided on the detectors. A grounding provision is provided. Unless

noted, enclosures shall be NEMA 4 listed by Underwriters Laboratories Inc. All detectors shall be listed by Underwriters Laboratories Inc. for

indoor or outdoor use.

Waterflow Detector Specifications

Standard Specifications

Static Pressure Rating

450 PSI

Operating Temperature Range

32°F to 150°F (0°C to 66°C)

Maximum Surge

18 Feet Per Second (FPS)

Enclosure Rating*

NEMA 4 – suitable for indoor/outdoor use

Triggering Threshold

Bandwidth (Flow Rate)

4–10 GPM

Cover Tamper Switch

Standard with ULC models, optional for

UL models, part no. CTS

Conduit Entrances

Two openings for ½ in. conduit.

NEMA 4 rated plugs

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

Contact Ratings

Two sets of SPDT (Form C)

10.0 A, ½ HP @ 125/250 VAC

2.5 A @ 6/12/24 VDC

Warranty

3 Years

Compatible Pipe

Steel water pipe, schedule

7 through 40*

WFDN Field Wiring Diagram

8.9 CM

(3.5")

6.6 CM

(2.6")

PIPE DIAMETER

PLUS 12.7 CM

(5")

PIPE

VANE

OVERALL WIDTH = PIPE DIAMETER + 6.4 CM (2.5")

U-BOLT

NUT

PIPE

SADDLE

U-BOLT

PIPE

Overall Dimensions, Installed

3825 Ohio Avenue • St. Charles, IL 60174

Phone: 800-SENSOR2 • Fax: 630-377-6495

www.systemsensor.com

©2016 System Sensor.

Product specifications subject to change without notice. Visit systemsensor.com

for current product information, including the latest version of this data sheet.

WFDS87903 • 11/16

Ordering Information

UL Model

ULC Model

Pipe Size

Hole Size

Shipping Weights

WFD20N

WFD20NA

2 in.

1¼ in.

2.6 lbs.

WFD25N

WFD25NA

2½ in.

1¼ in.

2.6 lbs.

WFD30N

WFD30NA

3 in.

2 in.

3.1 lbs.

WFD40N

WFD40NA

4 in.

2 in.

4.0 lbs.

WFD50N

WFD50NA

5 in.

2 in.

4.9 lbs.

WFD60N

WFD60NA

6 in.

2 in.

5.6 lbs.

WFD80N

WFD80NA

8 in.

2 in.

7.3 lbs.

Accessories

FS-RT

Delay mechanism and switch assembly

CTS

Tamper-proof switch kit

WFDW

Tamper-proof wrench for cover

* 2 in. - 4 in. rated for use with Schedule 7 through 40 pipe, 6 in. - 8 in. rated for use with Schedule 10 through 40 pipe.