Replacement Par t Number

Description

546-9000

Cover tamper switch kit

WFDW

Tamper proof wrench for cover

WFDN4

Gasket kit

Low flow rate vane-type water flow detector with solid state retard shall be an Accuflow model number ____________________

manufactured by System Sensor, and shall be installed on system piping as designated on the drawing and/or as specified

herein. Detectors shall mount on a stainless steel clear pipe span of the appropriate nominal size, either on a ver tical upflow

of 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 be compatible with 2” through 4” diameter stainless steel and brass pipe.

Detectors shall have a sensitivity of 3 gallons (11.35 liters) per minute minimum and a static pressure of 450 psi for 2” – 4”

diameter pipes. The detector shall respond to water flow in the specified direction after a preset time delay. The delay mech-

anism shall be a solid state unit which is field-adjustable via a dipswitch. The detector’s actuation mechanism shall include a

polyethylene vane inser ted through a hole in the pipe and connected by a mechanical linkage to the delay mechanism.

Outputs shall consist of one SPDT switch (Form C contact) and one SPST switch (normally open contact) for wiring to an

alarm panel or addressable control module and local bell and/or notification device. Two conduit entrances (one knockout

type) for standard fittings of commonly used electrical conduit shall be provided on the detectors. A grounding provision shall

be provided. Unless noted, enclosures shall be NEMA 4 listed by Under writers Laboratories, Inc. for indoor or outdoor use.

Engineering Specification

Ordering Information

Model Numbers

Nominal Pipe O.D. and Wall Thickness

Hole Size

LFD20

2” (60.3 mm OD), 3.9 mm to 4.5 mm

1-1/4"

LFD25-73MM

2-1/2” (73.0 mm OD), 4.8 mm to 5.2 mm

1-1/4"

LFD25-76MM

2-1/2” (76.1 mm OD), 4.3 mm to 4.7 mm

1-1/4"

LFD30-2

3” (88.9 mm OD), 5.0 mm to 5.6 mm

2”

LFD40

4” (114.3 mm OD), 5.4 mm to 6.4 mm

2"

System Sensor Sales and Service

© 2000 System Sensor. The company reser ves the right to change product specifications without notice.

A05-0290-000•9/00(5K)•#660

Standard Specifications

Static Pressure Rating

450 PSI

Triggering Threshold Bandwidth (Flow Rate)

3 GPM (11.35 liters/minute)

Maximum Surge

18 Feet Per Second (FPS)

Compatible Pipe

Stainless steel and brass water pipe,

2” through 4” (refer to Ordering Information

below)

Contact Ratings

One SPDT (Form C)

One SPST (normally open)

0.6 A @ 125 VAC

2.0 A @ 30 VDC

Voltage Range

8.4-35V (DC-FWR)

108-132 VAC

Current Draw

300 microamps @ 12/24 V(DC-FWR)

400 microamps @ 120 VAC

Conduit Entrances

Two openings for 1/2” conduit, one open, one

knock-out type

Operating Temperature Range

32°F - 120°F (0°C to 49°C)

Enclosure Rating

NEMA 4 - suitable for indoor/outdoor use

Cover Tamper Switch

Optional, par t no. 546-9000

Shipping Weight

LFD20:

4.1 lbs. (1.8 kg)

LFD25-73MM:

4.2 lbs. (1.9 kg)

AFD25-76MM:

4.2 lbs. (2.0 kg)

LFD30-2:

4.4 lbs. (2.1 kg)

LFD40:

5.1 lbs. (2.3 kg)

Ser vice Use

Water mist systems where low flow detection

is required.

Warranty

3 years

U.S. Patent No.

6,084,521

3.0

″

3.75

″

Pipe saddle

U bolt nut

Width: See Table

Plastic vane

Pipe

U bolt

1.6

″

Model Number

LFD20

LFD25-73MM

LFD25-76MM

LFD30-2

LFD40

Width

4.6

″

4.6

″

4.6

″

5.2

″

5.7

″

Overall Dimensions Installed

System Sensor Headquarters

3825 Ohio Avenue

St. Charles, IL 60174

Ph: 800-SENSOR2

Fx: 630/377-6495

Documents On Demand:

1-800-736-7672 x3

Web: www.systemsensor.com

System Sensor in Canada

Ph: 905.812.0767

Fx: 905.812.0771

System Sensor in Europe

Ph: + 44.1403.276500

Fx: + 44.1403.276501

System Sensor in China

Ph: + 86.29.524.6253

Fx: + 86.29.524.6259

System Sensor in Singapore

Ph: + 65.273.2230

Fx: + 65.273.2610

System Sensor in the Far East

Ph: + 852.21919003

Fx: + 852.27366580

System Sensor in Australia

Ph: + 613.54.281.142

Fx: + 613.54.281.172

System Sensor in India

Ph: + 91.11.558.2119

Fx: + 91.11.567.6815