S p r i n k l e r
S y S t e m S
m o n i t o r i n g
WFDEXP
Explosion Proof
Waterflow Detector
Models Available
WFD20EXP
WFD25EXP
WFD30-2EXP
WFD35EXP
WFD40EXP
WFD50EXP
WFD60EXP
WFD80EXP
WFD40EXP
Replacement Parts
A77-01-02
A3008-00
WFDRK
Terminal Block
Retard Mechanism
Hardware Kit
Product Overview
New WFD30-2EXP models install
in 2″ hole sizes
Designed and approved to operate
in hazardous locations
NEMA 4 enclosure rating
Sensitivity setting spring mechanism
located outside of explosion environment
Sealed retard mechanism
Visual switch activation
Synchronized activation circuit
Field-replaceable terminal block
and retard mechanism
Only one conduit entrance required
for hook-up
System Sensor’s WFDEXP series is designed to handle extreme conditions. These
units are ideal for installation in hazardous locations classified as follows:
Class I, Groups B, C, D, Division 1 & 2
Class II, Groups E, F, G, Division 1 & 2
Class III, Division 1 & 2
Robust Construction.
The WFDEXP series consists of a rugged, NEMA 4
rated cast aluminum housing. Designed for both indoor and outdoor use, the
WFDEXP series operates across a wide temperature range, from 32ºF to 160ºF.
Inside, two sets of SPDT (Form C) synchronized switches are enclosed in a
rugged terminal block, to assure reliable performance.
Reliable Performance.
The WFDEXP series offers unique features that assure
greater operational reliability. By housing the spring mechanism separately
from the explosion environment, the sensitivity of the adjustment spring and
the detector is protected at all times. Adding to the WFDEXP’s reliability is its
sealed retard mechanism, which prevents contamination by dust and dirt when
the cover is removed.
Simplified Operation.
Like all System Sensor waterflow detectors, the WFDEXP
series is designed to ease installation. With its visible switch activation, the
WFDEXP’s retard timing can be verified, even during noisy conditions.
E200116
C169
44-00-E
3006195
Engineering Specifications
Vane-type explosion proof waterflow detectors shall be installed on system piping on the drawing and/or as specified
herein. Detectors shall be mounted in hazardous locations classified as: Class I, Div. 1 and 2, Groups B, C, D; or Class
II, Div. 1 and 2, Groups E, F, G; or Class III, Div. 1 and 2. Detectors shall mount on any clear pipe span of the appropri-
ate nominal size, either a vertical upflow or horizontal run, at least 6″ from any fittings which may change water direc-
tion, 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 which is field adjustable. The delay mechanism shall be a
sealed mechanical pneumatic unit with visual indication of actuation. The actuation mechanism shall include a polyeth-
ylene 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 (one of which is a knockout type) for
standard fittings of commonly used electrical conduit shall be provided on the detectors. A grounding provision is pro-
vided. Enclosures shall be NEMA 4 listed by Underwriters Laboratories Inc. All detectors shall be listed by Underwriters
Laboratories Inc. for indoor or outdoor use.
Standard Specifications
Hazardous Locations Classifications
Class I, Div 1 and 2, Groups B, C, D
Class II, Div 1 and 2, Groups E, F, G
Class III, Div 1 and 2
Static Pressure Rating
450 psi (max)
Triggered Threshold Bandwidth (Flow Rate)
4 to 10 GPM
Maximum Surge
18 Feet per Second (FPS)
Contact Ratings
Two sets of SPDT (Form C)
10.0 A @ 125/250 VAC
2.5 A @ 24 VDC
Compatible Pipe
Steel water pipe, schedule 10 through 40
Weight
WFD20EXP
WFD25EXP
WFD30-2EXP
WFD40EXP
WFD50EXP
WFD60EXP
WFD80EXP
10.6 lbs.
10.7 lbs.
10.9 lbs.
11.5 lbs.
12.1 lbs.
12.5 lbs.
13.5 lbs.
Enclosure Rating
NEMA 4 – suitable for indoor/outdoor use
Overall Dimensions
6″H × 9″L × 6.5″W
Ser vice Use
Automatic Sprinkler:
National Fire Alarm Code:
Warranty
3 years
U.S. Patent Nos.
5,213,205; 4,782,333; 3,845,259
NFPA-13
NFPA-72
Conduit Entrances
Two openings for
1
⁄
2
″ conduit
Operating Temperature Range
32°F to 120°F (0°C to 49°C)
Ordering Information
Model Number
WFD20EXP
WFD25EXP
WFD30-2EXP
WFD35EXP
WFD40EXP
WFD50EXP
WFD60EXP
WFD80EXP
Part Number
A3008-0
A77-01-02
WFDRK
Pipe Size
2″
2
1
⁄
2
″
3″
3 ⁄
2
″
1
Hole Size
1
1
⁄
4
″
1
1
⁄
4
″
2″
1
1
⁄
4
″
2″
2″
2″
2″
4″
5″
6″
8″
Description
Replacement Retard Mechanism for all sizes 2″–8″
Replacement Terminal Block
Replacement Hardware Kit (contains tamper screws, wrench, and conduit plug)
System Sensor Sales and Service
System Sensor Headquarters
3825 Ohio Avenue
St. Charles, IL 60174
Ph: 800-SENSOR2
Fx: 630/377-6495
www.systemsensor.com
System Sensor Canada
Ph: 905.812.0767
Fx: 905.812.0771
System Sensor Europe
Ph: 44.1403.276500
Fx: 44.1403.276501
System Sensor in China
Ph: 86.29.8832.0119
Fx: 86.29.8832.5110
System Sensor in Singapore
Ph: 65.273.2230
Fx: 65.273.2610
System Sensor – Far East
Ph: 85.22.191.9003
Fx: 85.22.736.6580
System Sensor – Australia
Ph: 613.54.281.142
Fx: 613.54.281.172
System Sensor – India
Ph: 91.124.637.1770 x.2700
Fx: 91.124.637.3118
System Sensor – Russia
Ph: 70.95.937.7982
Fx: 70.95.937.7983
©
2003 System Sensor. The company reserves the right to change product specifications without notice.
A05-1030-004•10/03•#1125
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