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. These sensors utilize our advanced signal processing circuitry to automatically adjust the signal detection threshold in compensation for changing levels of activity and airflow this helps eliminate false on activations common in other ultrasonic sensors.

WattStopper® Ceiling Mount Occupancy Sensor, Series: W Series, 24 VDC, 16 mA, Ultrasonic Sensor, 500 sq-ft Coverage, 360 deg Viewing, 15 s to 30 min Time Delay, LED Lamp, 25 kHz Response, Flying Lead Connection, Automatic On/Automatic Off Control Output, 35 deg C, Plastic, White, 4-1/2 in W x 1-1/4 in D x 4-1/2 in H Dimensions

• https://externalassets.unilogcorp.com/ASSETS/DOCUMENTS/ITEMS/EN/IDW_DOCUMENT_ea3efa87be03370992ac07b9ec74f72d800be8047d4d2e0260e77a53b594270a.pdf https://www.iesbuy.com//ASSETS/DOCUMENTS/ITEMS/EN/https://externalassets.unilogcorp.com/ASSETS/DOCUMENTS/ITEMS/EN/IDW_DOCUMENT_ea3efa87be03370992ac07b9ec74f72d800be8047d4d2e0260e77a53b594270a.pdf

• 95% RH, non-condensing, for indoor use only environmental conditions
• WattStopper® W Series ultrasonic ceiling sensors are versatile motion detectors that control lighting in a wide variety of applications
• W Series sensors can be used individually or as part of an integrated system of WattStopper® lighting control products
• ASP circuitry helps to eliminate false on
• Utilizes advanced omni-directional, ultrasonic technology for reliable occupancy detection
• Omni-directional transmission provides 360 deg of coverage
• LED indicates occupancy detection
• 1 x 106 operating cycle
• 1 A at 24 VAC/VDC load rating