5
4 Detection Pattern
The LC-171 has a 90° top view PIR and MW detection pattern with over 18m (59 ft.)
detection distance (when installed at 1.2m (4 ft.) above the ground surface).
The LC-171 has an internal rotating housing (which includes the 2 PIR elements and the MW)
that can be adjusted horizontally, so its 90° coverage may vary between 0° and 180°.
The LC-171 can differentiate between pets and human bodies and alert accordingly by
having microwave movement detection combined with two PIR detection beams:.
A. Lower PIR element which is fixed to 18m (59 ft.) range and 60cm (2 ft) above ground level
which helps avoiding pet detection over the entire area.
B. Upper PIR element which has adaptive range between 3 and 18m (10 and 59 ft).
An intrusion is defined by both PIR detection beams being crossed and a Microwave detection
occurring, causing an alarm.
No alarm will be generated if only one of the PIR detection beams is crossed and microwave
detection occurs.
Detection area
Lower PIR element detection pattern
Fixed to 18m range
Microwave detection pattern Detection
No Detection
No pet detection in all
protected area
Upper PIR element detection pattern
Adjustable between 3m and 18m (10 ft to 59 ft)
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