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Abstract

The invention is directed to a detection system for detecting object presence in a detection zone and always detecting object departure from the detection zone so as to provide an object presence detection zone output signal indicative of zone occupancy. The system is comprised of a main system control unit mutually responsive to both an object presence signal from the zone and an object departure signal form the zone to provide the object presence detection zone output signal 'ON'. The object presence detection zone output signal remaining 'ON' for a preset time period, which preset time period is retriggered 'ON' as long as presence of an object in the zone is detected. The object departure signal causes a discrete moment of departure time delay signal that causes the object presence detection zone output signal to mm 'OFF' when no object presence is detected in the zone during the discrete moment of departure time delay. The main system control unit is further responsive to the triggering/retriggering of the preset time period 'ON' and the time delay moment of departure to ensure that the object presence detection zone output signal is 'ON' during the triggering/retriggering and the discrete moment of departure time delay and is turned 'OFF' just after the discrete moment in time and object departs the zone and no object has been detected in the zone.

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First Claim