Cut Sheet

PRODUCT DATA
OSSMD
Dual Relay Decora
®
Wall Switch
Multi-Technology Occupancy Sensors
BASIC OPERATION
Passive Infrared (PIR) technology is used to
detect motion and turn lights ON, while either
technology is used to keep lights ON while
occupied. This allows the Ultrasonic (U/S) to
be set to higher sensitivity levels minimizing
false OFF conditions. The PIR portion gives
immunity to false ON through a specialized
lens that divides the field-of-view into sensor
zones. When a person passes into or out of a
sensor zone, the sensor detects motion and
switches the primary lighting load ON while the
secondary relay operates in manual-ON/auto-
OFF (MD/GD models). With the FT models, both
relays operate in auto-ON/auto-OFF. The lights
will remain ON as long as there is an occupant
moving through
the sensor zones. The U/S
sensors give maximum
sensitivity and range in
difficult spaces with irregular shaped rooms and
partitions that can block the PIR field-of-view.
The OSSMD also features the ability to turn off
PIR or U/S to become a single tech device.
APPLICATIONS
• Private and Executive offices
• Conference rooms • Daylight harvesting
• Classrooms • Restrooms
• Storage areas • Training areas
• Multimedia rooms • Day care centers
• Lounges • Retrofits
• Bi-level or A/B switching
• Multi-location switching (similar to 3-way)
HOW THE OSSMD AUTOMATICALLY ADAPTS
CONDITION EXAMPLE ADAPTIVE REACTION
False-On:
Sensor
incorrectly
turns the
lights ON
False-Off:
Sensor
incorrectly
turns the
lights OFF
After an initial movement
is sensed, if another
movement is not sensed
within the timer setting the
delayed off-time setting is
automatically reduced
If motion is detected
shortly after the lights go
off, the current delayed
off-time setting is
increased
The sensor detects
movement in the
corridor or hallway
and the room light
turns ON
The sensor
does not detect
movement because
an occupant is
virtually motionless
and the lights turn
OFF
The OSSMD provides automatic lighting control
for two
separate loads from a single unit. It is
compatible
with incandescent, fluorescent, low-
voltage lighting and fan loads. The unit features
dual manual-override switches that can be used
to toggle the ON/OFF status of each lighting
load while an area is occupied. The OSSMD
can be
installed in place of two single-pole wall
switches
and fits in a standard single-gang wall
box. The second relay is manual-ON only and
complies with California Title 20/24.
Leviton Manufacturing Co., Inc. Global Headquarters
201 North Service Road, Melville, NY 11747-3138 tech line 800-824-3005 fax 800-832-9538
©2015 Leviton Manufacturing Co., Inc. All rights reserved. Subject to change without notice.

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