The range of energy-efficient lighting control products and systems manufactured by Legrand includes occupancy sensors that can save hours of wasted electricity each day.
The range of sensors, based on passive infrared and ultrasonic technologies, is designed to switch lighting off in unoccupied areas. The sensors detect occupancy and motion and monitor and control lighting accordingly, offering substantial energy savings.
Passive infrared (PIR) technology senses occupancy by detecting the difference between heat emitted from the human body in motion and the background space. Passive infrared sensors rely on a clear line-of-sight that makes 100% coverage cut off possible. The Legrand units have a unique Fresnel lens that divides the coverage into zones, enhancing detection of small movement without raising false activations. The flat, low profile of passive infrared ceiling-mounted sensors leaves ceilings uncluttered.
Ultrasonic sensors are based on the Doppler principle and work by bouncing ultrasonic sound waves off objects in an area and measuring the time it takes for the waves to return, in order to detect occupancy. These sensors automatically adjust the signal detection threshold to compensate for changing levels of activity and air flow. This helps to eliminate false activations.
Dual technology sensors, which ensure optimum sensitivity and coverage without the threat of false triggers, offer the greatest energy savings. These sensors can detect the slightest motion and keep lights on as long as the space is occupied.
These attractive, low profile sensors, provide full 360º coverage and can control a range of applications, either individually or in zones that overlap. All units have a built-in light level sensor that allows for the use of natural light to increase energy savings.
Legrand also manufactures a walk-through module which turns lights off three minutes after an area is initially occupied, if no movement is detected within 30 seconds. Manual on/off control offers the convenience of a low voltage switch input (on low voltage sensor modules) so that wiring to a momentary wall switch is quick and easy.
Legrand’s occupancy sensors are available nationally from the company’s distributor network.