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 46360 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: info@dwyermail.com
©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 9/14 FR# R3-443384-00 Rev.1
T
he small and discreet Model WD Water Detector is designed for dependable
detection of low levels of conductive liquids. The module features a sturdy and reli-
able aluminum enclosure and is powered by 24 VAC or 24 to 30 VDC. Water sens-
i
ng tape attaches to module and if any liquid comes in contact with the tape the
r
esistance is changed and the alarm will be triggered. The tape is hydrophobic so it
d
oes 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 extend the coverage area which makes
it ideal for domestic as well as commercial applications. Typical uses include com-
puter 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 it-
self to make sharp corners. Insulate tape from conduits and ground wires. Ground-
ed tape may cause detector failure.
OPERATION AND TROUBLESHOOTING
Green LED will indicate proper power. Red LED is an alarm indicator. The water de-
tector 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 operation. De-
pressing 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 connectors shown in Figure 1.
Both outputs of alarm relay function identically. Contacts could be connected in par-
allel if load is heavier than 1A @ 24V. Do not apply voltages greater than 30 to alarm
outputs.
S
PECIFICATIONS
Service: Conductive Liquid.
Switch Type: DPDT.
E
lectrical Rating: 1A @ 24 VAC/VDC.
P
ower Requirements: 24 VAC, 24 to 30 VDC.
P
ower 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).
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 attempted and may void warranty). Be sure to include a brief de-
scription of the problem plus any relevant application notes. Contact customer ser-
vice 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
–
Ø1/4
[Ø6.35]
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
L
IGHT
GREEN
LED LIGHT
1/8
[2.10]
1-3/4
[44.17]
3
[76.38]
1/2˝ CONDUIT OR FLEX
CONNECTOR
Ø7/8
[Ø22.23]
W
D
TEST
WATER DETECTOR
ALARM
P
OWER
Figure 1: Wiring Connections
-
1
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