A special lens has been developed to sense both normal movements and micro movements. Normal ‘movement’ is detected over the wider area of 8 x 8m, while the ‘presence zone’ has increased sensitivity for the detection of small movements within a central area of 4 x 4m. The 18.5D integral sensor can be used in one of three selectable modes – each responding in a different way to the detection of movement and ambient brightness.

•  Comfort  Daylight-linked constant light level control: Suitable for small offices and workplaces, the energy-saving Comfort mode maintains a constant brightness level according to the movement and changes in ambient daylight by increasing or decreasing the level of artificial light accordingly.

•  Simplicity – ON/OFF control with early warning: Works as a simple movement detector, activating lamps at 100% power, and provides warning of an impending shutdown with a power reduction to 50% for 20 seconds, avoiding the sudden total shutdown of lighting.

•  Courtesy – ON/OFF control with early warning + courtesy light level: Suitable for common areas such as corridors. If brightness level is lower than the set value, artificial light is maintained at 10% power, guaranteeing a constant minimum level of illumination. When movement is detected, the lamp power is raised to 100%. Courtesy mode also gives early warning of impending reduction from the 100% power level by reducing to 50% for 20 seconds.

With the 18.5D it is possible to control up to 8 DALI ballasts. Addressing is done in ‘Broadcast’ mode, i.e. all the DALI ballasts are ‘slaves’ to execute the command received from the movement detector. The 18.5D features adjustable delay to shutdown from 10 seconds to 35 minutes; level of brightness adjustable from 10 lux to 800; power supply 110-230 VAC (50/60Hz).