Occupancy Sensors
Occupancy
sensors
for lighting control typically use infrared (IR), ultrasonic, tomographic
motion detection, microwave sensors, or camera-based sensors (image
processing). The field of view of the
sensor must be carefully selected/adjusted so that it responds only to motion
in the space served by the controlled lighting. For example, an occupancy
sensor controlling lights in an office should not detect motion in the corridor
outside the office. Tomographic motion detection systems have the unique
benefit of detecting motion through walls and obstructions, yet do not trigger
as easily from motion on the outside of the detection area like traditional
microwave sensors.
Sensors and their
placement are never perfect, therefore most systems incorporate a delay time
before switching. This delay time is often user-selectable, but a typical
default value is 15 minutes. This means that the sensor must detect no motion
for the entire delay time before the lights are switched. Most systems switch
lights off at the end of the delay time, but more sophisticated systems with
dimming technology reduce lighting slowly to a minimum level (or zero) over
several minutes, to minimize the potential disruption in adjacent spaces. If
lights are off and an occupant re-enters a space, most current systems switch
lights back on when motion is detected. However, systems designed to switch
lights off automatically with no occupancy, and that require the occupant to
switch lights on when they re-enter are gaining in popularity due to their
potential for increased energy savings. These savings accrue because in a
spaces with access to daylight the occupant may decide on their return that
they no longer require supplemental electric light.
User
Benefits
Saves electrical energy in Air
Conditioners, Fans and Lighting
Reliable due to various inbulit
protections
No nuisance switching due to
precision detection logic
Additional power saving by
ambient light sensing for lighting switching
No wiring needed! Aesthetics of
room is retained intact
Good ROI! Starts saving
immediately
Sensor can be freely placed where
required
Switches will work, even if
sensors fail or run out of battery!
Rapid deployment in under an hour
Adds convenience and is also
beneficial to environment!
Single sensor can control
multiply switches
Conforms to NBC, IESNA, IGBC,
GRIHA and USGBC standards.
Applications
Cabin lighting & AC
Corridor lighting
Street lighting
Toilet lighting & exhaust
fans
Warehouses
Elevators
Staircases
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