Save 8% on the Wattstopper W-500A Ultrasonic Ceiling Occupancy Sensor by Watt Automatic or manual-on operation when used with a BZ-150 Power PackManual-on Option. Applications. Ultrasonic sensors effectively control offices, rest- rooms, utility areas, open office spaces and warehouses. The W-500A is Wattstopper W-500A Ultrasonic Occupancy Sensor Occupancy Sensor, 360°, Ceilng Mount, Ultrasonic, 24VDC, Coverage: 500 Sq. Ft. In addition, they can be used with Watt Stopper Sentry Switches for manual-on/auto-off function when automatic-on is not desired. Ultrasonic Temperature and humidity-resistant 25 kHz receivers, W-500A contains 1 receiver, other models Watt Stopper Ultrasonic Sensors are 24VDC switching devices that automatically switch lighting and HVAC systems off when no motion is sensed over a given WattStopper's W Series Ultrasonic Ceiling Sensors are versatile motion detectors that control lighting in a wide variety of applications. Description. Wattstopper's W Series Ultrasonic Ceiling Sensors are versatile Sensors can be used with a BZ-150 power pack for manual-on/ The W-500A is. Auto/manual ON operation when used with a BZ-150 power pack; Utilizes advanced omnidirectional, ultrasonic technology for reliable occupancy detection Wattstopper W-500A Ultrasonic Occupancy Sensor. Wattstopper W-500A Installation Manual Register or Log In with your Rexel Account for price or to order. Summary of Contents for Watt Stopper W-500A. Page 1 Power Supply .Watt Stopper Power Packs Current Consumption 16mA Sensitivity Adjustment . Page 2 Watt Stopper sensors then control lighting systems through Watt Stopper power and auxiliary relay packs.