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˝ from any fittings that 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 450 psi* for 2˝ – 8˝ 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 indication of actuation. The actuation mechanism shall include

a polyethylene 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

3825 Ohio Avenue • St. Charles, IL 60174

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

©2009 System Sensor.

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

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

A05-0180-013 • 1/09 • #1922

Standard Specifications

Static Pressure Rating

450 PSI*

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. 546-7000

Conduit Entrances

Two openings for ½˝ conduit.

One open, one knock-out type

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

U.S. Patent Numbers

5,213,205

Compatible Pipe

Steel water pipe, schedule 10 through 40

Warranty

3 Years

DELAY

ADJUSTMENT

DIAL

45

TI

ME

DEL

AY IN SECO

ND

S

MB

ER

ON

DIAL IS APPR

OXIM

A

NOTE: RETARD TIME MAY EXCEED 90 SECONDS. ADJUST

AND VERIFY THAT TIME DOES NOT EXCEED 90 SECONDS.

NUMBER ON DIAL IS APPROXIMATE TIME DELAY IN

SECONDS WITH AN ACCURACY OF +/− 50%.

Delay Adjustment Dial

+

+

–

–

SSM24-X

SSV120-X

NOTE: COMMON AND B-NO

CONNECTIONS WILL CLOSE

WHEN VANE IS DEFLECTED, I.E.,

WHEN WATER IS FLOWING. DUAL

SWITCHES PERMIT

APPLICATIONS TO BE COMBINED

ON A SINGLE DETECTOR.

BREAK WIRE AS

SHOWN FOR

SUPERVISION OF

CONNECTION. DO

NOT ALLOW

STRIPPED WIRE

LEADS TO EXTEND

BEYOND SWITCH

HOUSING. DO NOT

LOOP WIRES.

POWER

24VDC OR

120VDC

INITIATING

LOOP

UL-LISTED

COMPATIBLE

CONTROL PANEL

CONTACT RATINGS

125/250 VAC

24 VDC

10 AMPS

2.5 AMPS

SCHEMATIC OF

INDIVIDUAL

SWITCH IN

“NO WATERFLOW”

CONDITION

SUGGESTED EOL

RESISTOR

B-NO

COM

A-NC

WFD Field Wiring Diagram

Ordering Information

UL Model

ULC Model

Pipe Size

Hole Size

Shipping Weight

WFD20

WFD20A

2˝

1¼˝

4.2 lbs.

WFD25

WFD25A

2½˝

1¼˝

4.3 lbs.

WFD30-2

WFD30-2A

3˝

2˝

4.5 lbs.

WFD35

WFD35A

3½˝

1¼˝

4.7 lbs.

WFD40

WFD40A

4˝

2˝

5.2 lbs.

WFD50

WFD50A

5˝

2˝

6.3 lbs.

WFD60*

WFD60A

6˝

2˝

6.8 lbs.

WFD80*

WFD80A

8˝

2˝

7.5 lbs.

Accessories

A3008-00

Retard mechanism

A77-01-02

Terminal block

546-7000

Tamper-proof switch kit

WFDW

Tamper-proof wrench for cover

WFDN4

Gasket kit

*Maximum pressure rating 400 psi as approved by Factory Mutual.

3.0″

3.75″

Pipe saddle

U bolt nut

Width: See Table

Plastic vane

Pipe

U bolt

1.6″

Model

WFD20

WFD25

WFD30-2

WFD35

Width

4.6″

4.6″

5.2″

5.7″

Model

WFD40

WFD50

WFD60

WFD80

Width

6.8″

7.8″

9.0″

10.8″

Overall Dimensions, Installed