The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes. Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2014 Dwyer Instruments, Inc.

1. Water Detectors
The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees
as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes.
Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used
without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2014 Dwyer Instruments, Inc.

2. Overview
WD – Water Detector and Sensor Tape
WD3 – Water Leak Detector

3. WD - Introduction
Designed for dependable detection of low levels of
conductive liquids
Water sensing tape attaches to module and if any
liquid comes in contact with the tape the resistance
is changed and the alarm will be triggered
Tape is hydrophobic. Faster drying time since tape
doesn’t absorb

4. WD - Key Specifications
Switch Type: DPDT
Electrical Rating: 1 A @ 24 VAC/VDC
Power Requirements: 24 VAC, 24 to 30 VDC
Power Consumption: 35 mA maximum
Enclosure: Extruded aluminum
Sensor Tape: 1˝ (25.4 mm) wide and 5´ (1.5
meters), 10´, 15´ or 25´ (8 meters) long

5. WD - Features
Sensing tape is 1˝ wide and can be bought in
lengths of 5´ (1.5meters), 10´, 15´ and 25´
(8meters)
Multiple tapes can be connected together to
extend the coverage area (120 meter max)
Power and alarm LED’s,
Other features include alarm test switch,
continuous tape integrity self check and
extendable tape sensor

6. WD - Applications
Leak detection for large equipment
Furnaces, boilers, chillers,
Data Centers, etc
Tape can cover the whole
floor under the equipment

7. WD - Applications
Evaporator pans under refrigerators, freezers,
and air handlers
General utility rooms in plants

8. WD3 - Introduction
Detects the presence of water to prevent water
damage
Audible and visual alerts provide local indication
of the alarm condition
Internal switch will give remote indication or
control to prevent further build up of water

9. WD3 -Key Specifications
Switch Type:
Battery Powered Models: SPST NO
External Powered Models: DPDT
Audible Alarm: At least 85 dB @ 1 foot distance
(depends on model).
Visual Alarm:
Red LED for water level
Yellow LED for low battery (battery powered models only)
Green LED for power condition (external powered models
only)

10. WD3 - Key Specifications
Enclosure Material: ABS and polycarbonate
with flammability classification UL 94 V-0.
Enclosure Rating:
Audible Alarm Models: Water-tight up to 3/4 of the
body height
Non-Audible Alarm Models: NEMA 6P (IP 68)
submersible
Agency Approvals: CE, RoHS

11. WD3 - Technology
The sensor consists of two electrical contacts
When the water level reaches a certain level, it
bridges the contacts and allows current to flow

12. WD3 - Features
Depending on the model ordered
Audible and visual alerts provide local indication of the
alarm condition
Internal switch will give remote indication or control to
prevent further build up of water
Sensing height can be adjusted by using bracket
Mounting bracket can attach to any flat surface by
either using the attached adhesive strips or
mounting screws
Can be battery-powered or externally powered

13. WD3 - Applications
Condensate leak detection
Air handlers, fan coil units,
unit ventilators, data centers

14. WD3 - Applications
Under-floor air systems
Raised floors serve as the air
circulation space for heating
and cooling