Dwyer WD - Manual

Model WD Water Detector and Sensor Tape
Bulletin L-WD
Specifications - Installation and Operating Instructions
W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
©Copyright 2005 Dwyer Instruments, Inc. Printed in U.S.A. 12/05 FR# R2-443384-00
The small and discreet Model WD Water Detector is designed
for dependable detection of low levels of conductive liquids. The
module features a sturdy and reliable aluminum enclosure and is
powered by 24 VAC or 24 to 30 VDC. Water sensing tape attach-
es to module and if any liquid comes in contact with the tape the
resistance is changed and the alarm will be triggered. The tape is
hydrophobic so it does not absorb any of the liquid it is detecting
which makes for a faster drying time and faster return to service
after a water leak.
The sensing tape is 1˝ wide and can be bought in lengths of 5, 10,
15 and 25 feet. Multiple tapes can be connected together to ex-
tend the coverage area which makes it ideal for domestic as well
as commercial applications. Typical uses include computer rooms,
telecommunication facilities, in drip pans under HVAC equipment
and around water pumps.
INSTALLATION
Remove front panel of device. Run wires through back plate and
make terminations. Reassemble front panel. Plug the tape into the
module and fasten the mounting screws. Use included plastic clips
to mount tape to clean and dry surface. Contact cement provides
a more secure installation than double face tape. Fold tape on itself
to make sharp corners. Insulate tape from conduits and ground
wires. Grounded tape may cause detector failure.
OPERATION AND TROUBLESHOOTING
Green LED will indicate proper power. Red LED is an alarm indica-
tor. The water detector will go to alarm contact state on loss of
power or if the tape sensor is removed. An open or shorted tape
will be sensed by the detector and will produce an alarm contact
state as well. The “Test” button can be used to test module opera-
tion. Depressing the button will simulate water detection on the
tape and produce an alarm contact state. It is important to dry
sensing cable with paper towel in case alarm has been caused by
water. Do not allow water to evaporate on its own. Conductive
residue will be left behind which will change tape’s resistance. In
worst case false alarms may occur over time.
If alarm is present and water cannot be located:
1. Disconnect tape
2. Unplug end of line (EOL) resistor from end of tape
3. Plug EOL resistor into the module
If alarm clears then replace the tape.
If alarm persists then replace the module.
WIRING
Model WD Water Detector is provided with round opening for 1/2˝
conduit or flex connector. Terminations are made to screw terminal
SPECIFICATIONS
Service: Conductive Liquid.
Switch Type: DPDT.
Electrical Rating: 1A @ 24 VAC/VDC.
Power Requirements: 24 VAC, 24 to 30 VDC.
Power Consumption: 35 mA maximum.
Electrical Connections: Screw terminals.
Conduit Connections: Hole for 1/2˝ conduit.
Enclosure: Extruded aluminum.
Sensor Tape: 1˝ (25.4 mm) wide and 5, 10, 15 or 25 feet long.
Weight: 8 oz (.23 kg).
connectors shown in Figure 1. Both outputs of alarm relay function
identically. Contacts could be connected in parallel if load is heav-
ier than 1A @ 24V. Do not apply voltages greater than 30 to alarm
outputs.
MAINTENANCE
Upon final installation of the Model WD Water Detector, no routine
maintenance is required. A periodic check of the system calibration
is recommended. The Model WD is not field serviceable and
should be returned if repair is needed (field repair should not be at-
tempted and may void warranty). Be sure to include a brief de-
scription of the problem plus any relevant application notes.
Contact customer service to receive a return goods authorization
number before shipping.
RELAY
OUTPUT 1
RELAY
OUTPUT 2
POWER
24 VAC OR DC
CONTACTS AS SHOWN
WHEN DEVICE IS POWERED
AND NO ALARM PRESENT
+
OR
–
Ш1/4
[Ш6.35]
1-1/2
[38.10]
1/4
[6.35]
4-1/4
[107.32]
4-3/4
[120.02]
PUSH
BUTTON
15 PIN CABLE
CONNECTION
AMBER
LED
LIGHT
GREEN
LED LIGHT
1/8
[2.10]
1-3/4
[44.17]
3
[76.38]
1/2˝ CONDUIT OR FLEX
CONNECTOR
Ш7/8
[Ш22.23]
WD
TEST
WATER DETECTOR
ALARM
POWER
Figure 1: Wiring Connections
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