Systemsensor LFD20 Low flow rate waterflow detector Datasheet

Accuflow™ Series
Low Flow Rate
Waterflow Detectors
Models Available
LFD30-2
LFD20
LFD25-73MM
LFD25-76MM
LFD30-2 (cover removed)
LFD30-2
LFD40
Replacement Par ts
WFDW
Cover wrench
546-9000
Cover tamper
switch kit
WFDN4
Gasket kit
Product Overview
For use in wet pipe water mist systems
Compatible with 2 to 4 inch stainless
steel and brass pipe
Solid state retard assures precise
timing accuracy
Dipswitch selections simplify
retard settings
Non-polarized, two-wire design
allows connection to a local bell and
conventional or addressable systems
NEMA 4 rated
Synchronized switches activate
both the alarm panel and local
bell simultaneously
®
System Sensor’s Accuflow™ Low Flow Rate detectors are a new line of solid state
waterflow detectors designed for use in wet pipe water mist systems where low
flow detection is required.
Robust Construction. Accuflow low flow detectors consist of a rugged enclosure for
indoor and outdoor use. Like all System Sensor waterflow detectors, low flow models
operate across a wide temperature range, from 32ºF to 120ºF (0°C to 49°C).
Reliable Performance. Accuflow low flow detectors are intended for applications
where flow detection of 3 GPM or greater is required. By incorporating a solid state
retard, proper sensitivity, timing accuracy and switch resetting is assured.
False Alarm Immunity. The solid state circuitry of Accuflow low flow detectors
provides greater timing accuracy over traditional mechanical retard designs. This
accuracy minimizes the risk of false alarms created by pressure surges or air trapped
within the sprinkler system.
Simplified Operation. Accuflow low flow detectors are designed to simplify installation. Wired like traditional waterflow detectors, these models do not require the
installer to run an additional third wire. Two conduit openings permit easy attachment to the local alarm system.
Engineering Specification
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 mechanism 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.
Standard Specifications
Static Pressure Rating
450 PSI
Cover Tamper Switch
Optional, par t no. 546-9000
Contact Ratings
One SPDT (Form C)
One SPST (normally open)
0.6 A @ 125 VAC
2.0 A @ 30 VDC
Triggering Threshold Bandwidth (Flow Rate)
3 GPM (11.35 liters/minute)
Maximum Surge
18 Feet Per Second (FPS)
Shipping Weight
LFD20:
LFD25-73MM:
AFD25-76MM:
LFD30-2:
LFD40:
Voltage Range
8.4-35V (DC-FWR)
108-132 VAC
Compatible Pipe
Stainless steel and brass water pipe,
2” through 4” (refer to Ordering Information
below)
3.75″
Conduit Entrances
Two openings for 1/2” conduit, one open, one
knock-out type
3.0″
lbs.
lbs.
lbs.
lbs.
lbs.
(1.8
(1.9
(2.0
(2.1
(2.3
kg)
kg)
kg)
kg)
kg)
Ser vice Use
Water mist systems where low flow detection
is required.
Current Draw
300 microamps @ 12/24 V(DC-FWR)
400 microamps @ 120 VAC
Overall Dimensions Installed
4.1
4.2
4.2
4.4
5.1
Warranty
3 years
U.S. Patent No.
6,084,521
Operating Temperature Range
32°F - 120°F (0°C to 49°C)
U bolt nut
1.6″
Enclosure Rating
NEMA 4 - suitable for indoor/outdoor use
Pipe saddle
Pipe
Plastic vane
U bolt
Width: See Table
Model Number
LFD20
LFD25-73MM
LFD25-76MM
LFD30-2
LFD40
Width
4.6″
4.6″
4.6″
5.2″
5.7″
Ordering Information
Model Numbers
Nominal Pipe O.D. and Wall Thickness
Hole Size
Replacement Part Number
Description
LFD20
2” (60.3 mm OD), 3.9 mm to 4.5 mm
1-1/4"
546-9000
Cover tamper switch kit
LFD25-73MM
2-1/2” (73.0 mm OD), 4.8 mm to 5.2 mm
1-1/4"
WFDW
Tamper proof wrench for cover
LFD25-76MM
2-1/2” (76.1 mm OD), 4.3 mm to 4.7 mm
1-1/4"
WFDN4
Gasket kit
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
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 China
Ph: + 86.29.524.6253
Fx: + 86.29.524.6259
System Sensor in the Far East
Ph: + 852.21919003
Fx: + 852.27366580
System Sensor in Europe
Ph: + 44.1403.276500
Fx: + 44.1403.276501
System Sensor in Singapore
Ph: + 65.273.2230
Fx: + 65.273.2610
System Sensor in Australia
Ph: + 613.54.281.142
Fx: + 613.54.281.172
© 2000 System Sensor. The company reserves the right to change product specifications without notice.
System Sensor in India
Ph: + 91.11.558.2119
Fx: + 91.11.567.6815
A05-0290-000•9/00(5K)•#660
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