Dual-Relay PIR Occupancy Sensor


The WS OS IDR uses passive infrared (PIR) technology to monitor a room for occupancy through a segmented Fresnel lens. This specialized lens 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 two separate lighting loads ON. The lights will remain ON as long as there is an occupant moving through the sensor zones.

Provides automatic switching of two separate lighting loads from a single unit. It is compatible with incandescent, fluorescent and low-voltage lighting. 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. Can be installed in place of two single-pole wall switches and fits in a standard single-gang switch box.

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Features & Specifications

• Convenient dual push buttons provide manual-ON/OFF light switching of each load at any
• Conference Room Mode—primary and secondary relays switch lighting to last ON/OFF status
when personnel enter room, providing a consistent lighting level from one occupancy period
to the next. Both relays respond to Ambient Light Override, preventing lights from turning ON
automatically during periods of ample natural light, for increased energy savings.
• Classroom Mode—both primary and secondary relays always switch lighting ON when
personnel enter room, regardless of their ON/OFF status during last period of occupancy.
Secondary relay only responds to Ambient Light Override—primary does not, ensuring that
students and personnel never enter a darkened room.
• Presentation Mode feature for slide or film presentations allows push buttons to turn lights
OFF and keep them OFF while the room is occupied.
• Auto adapting delayed-OFF time interval compensates for real-time occupancy patterns,
preventing unnecessary ON/OFF switching.
• Exclusive Walk-Through feature provides increased energy savings by not leaving the lights
ON for an extended period after only momentary occupancy.
• Non-Adaptive Mode disables Self-Adjusting Delayed-OFF Time and Walk-Through feature in
applications where these features are not desired.
• Daylight harvesting light sensor measures the ambient light in the room when it first detects
motion. It leaves the lights OFF if there is enough light in the room or turns the lights
connected to the first relay ON if there is not enough light in the room.
• Low-profile design eliminates obtrusive “scanning-device” look.
• 180° field-of-view provides approximately 2100 square feet of coverage, suitable for a variety
of commercial areas.
• Segmented Fresnel lens provides optimum sensitivity and performance. Designed with an
extensive “minor motion” area where even slight body movements will be detected.
• Patented blinders: horizontal field-of-view may be adjusted between 180° and 60° arc by
using integral blinders located on either side of the lens. No masking tape required.
• Time delay adjustment for delayed-OFF time settings of 30 seconds, 5, 10, and 30 minutes.
Allows customized adjustments to maximize energy savings.
• Manual-ON/auto-OFF mode for installations where manual-ON switching is required but autoOFF switching is still desired for CEC Title T20/24 energy savings.
• Beep warn – unit beeps 3 times after delayed-OFF time expires, then waits 10 seconds before
turning lights OFF.
• One unit can be used for 120V through 277V lighting. Compatible with both electronic and
magnetic ballasts.
• Primary relay switches at the zero crossing point of the AC power curve to ensure longer
contact life and compatibility with electronic ballasts.
• Exclusive H.I.S. Circuitry. Specifically designed to handle today’s high inrush electronic ballast
loads and offer unmatched durability and service.

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