PIR technology senses occupancy by detecting the difference between heat emitted from the human body in motion and the background space. Relying on a clear line-of-sight view, passive infrared sensors make 100% coverage cut off possible. These sensors utilize a unique fresnel lens which divides the coverage area into zone, enhancing detection of small movement. Using the doppler principle, ultrasonic sensors work by bouncing ultrasonic sound waves off objects in an area and measuring the time it takes for the waves to return. Movement by a person in the area causes the sound waves to return at a changed frequency, resulting in a doppler shift and occupancy detection.

WattStopper® Wall Switch Occupancy Sensor, Dual Technology Dual Relay, Series: DSW, 120/277 VAC, 0 to 1200 W, 1/6 hp Power, Passive Infrared/Ultrasonic Sensor, 1050 sq-ft Coverage, 180 deg Viewing, 5 to 30 min Time Delay, LED Lamp, Flying Lead Connection, Automatic On/Off, Manual On/Off Control Output, Surface Mounting, 35 deg C, Plastic, Ivory, 2.73 in L x 1.75 in W x 1.81 in H Dimensions

• Time delay adjustments - 5 to 30 min at minimum, 3 minimum if no activity after 30 s at walk through mode, 5 s for 10 min with dip switch setting at test mode
• High or low (dip switch) PIR adjustment and minimum to maximum (trimpot), OFF ultrasonic adjustment
• 1000 W tungsten, ballast, E-ballast, LED, 1/4 hp load limit for relay 1 at 120 VAC, 1200 W ballast, E-ballast, LED, 1/4 hp load limit for relay 1 at 277 VAC, 800 W tungsten, ballast, E-ballast, LED, 1/6 hp load limit for relay 2 at 120 VAC, 1200 W ballast, E-ballast, LED, 1/6 hp load limit for relay 2 at 277 VAC
• Complies with 2011 NEC requirements
• Zero crossing for long relay life
• Vandal-resistant lens combines precise coverage with durability
• Selectable walk through mode turns lights off 3 minutes after the room is initially occupied if no motion is detected after the first 30 s
• Test mode allows quick and easy adjustments
• Selectable audible alert for impending shutoff
• In automatic mode, sensor returns automatically to auto-ON after lights are turned OFF manually, ideal for presentations
• Four occupancy logic options give users the ability to customize control to meet application needs
• Optional light level sensing with simple setup
• Service mode allows sensor to operate as a service switch in the unlikely event of a failure
• Sensor coverage tested to NEMA guide publication WD 7-2000
• 2-relays for control of two separate lighting loads or circuits
• E-ballast load type
• Optional neutral
• Turns lights on and off based on occupancy
• Replaces existing wall switches and fits behind a standard decorator wallplate

• Specification Sheet https://assets.unilogcorp.com/2/ITEM/DOC/IDW_DOCUMENT_cbe7ca5ed95ea278a170645f7369579ea89804ed0ced2a96040d384862a639f3.pdf