Duevi DIRFE, Инструкция по эксплуатации

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7. DIRECTIONAL AND
The “directional AND” function allows to further refine the alarm is generated. This function set the sensor to generate alarm
only under a precise detection order of the heads: first the upper head (farther beam) and then, within the AND time, the
lower head (closer beam).
This function allow a directional detection, that is the sensor can detect an approaching to the protected area without
generate alarms when people just move inside the upper head area without move towards the inner zone.
Fig. 4 - Directional AND: the man generates alarm, the dog doesn’t
It is also possible to orient the IR heads on opposite sides to obtain a directional detection:
Normal AND Directional AND
The sensor generates alarm only when an intruder moves from one
area to the other, no matter in which direction. A movement inside
of one single area does not generate alarm.
The sensor generates alarm only an intruder moves from the upper
head detection area to the lower head one.
DIP3=OFF DIP3=ON
Top view Top view
2,2 [m]
Upper
IR head
Lower
IR head
Lower
IR head
Upper
IR head