User's Manual

10-6 the Passive Infrared Reader (PIR) Installation Manual
PIR “Masking”
If you have adjusted the PIR beam angle and the
area covered is still too large and is overlapping
into undesired areas, use the following
“masking” method to reduce the effective area
of the beams:
1. The PIR has 3 “beams.” The low beam
reaches about 10’, the middle beam
reaches about 30’, and the high beam
can reach 40-60’ (
see Figure 10.3).
“Masking” a PIR means covering one or
more of the beams to reduce the PIR’s
range.
2. Place one strip of electrical tape
horizontally across the top of the PIR
lens (
see Figure 10.6); this will cover the
high beam.
3. Test the range of the PIR.
4. If necessary, place another strip of tape
horizontally in the middle of the PIR
lens; this will cover the middle beam.
5. Test the range of the PIR.
6.
OPTIONAL: If the PIR is extending too
far outward (to the sides), place stripes
of tape vertically on the sides of the PIR
lens (
see Figure 10.7); this will cover all
outward beams producing a narrower
coverage area.
7. Test the range of the PIR.
Figure 10.6 PIR Masking horizontal example
Figure 10.7 PIR Masking vertical example