New Crestron Green Light occupancy sensors optimize energy usage

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January 28, 2009 Crestron has released a new range of occupancy sensors to enhance the functionality of its Green Light™ environmental controls, further reducing energy usage. The sensors have built-in microprocessors and photocells which continually analyze and adjust to changing conditions to significantly reduce on-time for lights. Climate and device control can also be integrated. A combination of both ultrasonic and passive infrared sensing is used to detect motion while minimizing false triggers, such as electrical noise, air currents, and temperature changes. A built-in photocell can override the occupancy sensor if ambient light levels are above a set threshold, preventing lights from turning on when there is sufficient daylight in the room.

Upon activation, each sensor initiates in “walk-through” mode. “Walk-through” mode is active for a two and a half minute interval, during which lights turn off promptly when a person enters and exits the room. After the 2.5 minute period of occupancy, the sensor shifts into “occupied” mode. “Delayed off” is initially set via the timer knob on the sensor, turning lights off when no motion is detected after a specific time. While the sensor is in use, the sensor learns room occupancy patterns. The delayed off time will change as the sensor intelligently adapts to environmental conditions and occupancy patterns.

An array of sensors are available for different room sizes, the sensors can be wall- or ceiling- mounted and their behavior can be customized via the Crestron control system.

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