NAPCO C-200AP Installation Instructions Manual - page 12
with the ALARM jumper installed.
Test for environmental disturbances.
Note: The following test is applicable to the PIR section only. There are no
provisions for testing the microwave section for environmental disturbances.
This test will determine if detection occurs with no human activity in the
protection area. Be sure to make this test with all potential disruptive devices
(heaters, air conditioners, etc.) in full operation. Note that blowing curtains
may be troublesome.
Install the PIR Walk-Test jumper. Leave the protection area. If an alarm
condition occurs with no one in the coverage area, temporarily block the entire
lens with a sheet of cardboard or other opaque material. If the alarm condition
persists with the lens covered, it is not caused by an environmental distur-
bance, and the system requires attention. (Check for low supply voltage from
the control center, or for an intermittent connection.)
Remove the cardboard (or other material) from the front of the lens. If the
alarm condition reoccurs, turn off heaters, air conditioners, etc. one by one
and note the effects. If the offending device must remain in operation within
the coverage area, try to reposition the device and/or alter the aim of the
sensor slightly to effect a suitable compromise. Bear in mind, however, that
each time the coverage pattern is altered, the foregoing environmental test
must be repeated.
Zone Masking
If a workable solution cannot be achieved using the above technique,
selective zone masking will be required. This will deactivate a problem zone
in order to preserve reliable
system operation. Carefully
apply a piece of zone-mask-
ing foil (supplied) to the
grooved inside surface of the
lens segment representing
the problem zone to block
signal from the offending de-
vice (refer to Figs. 7 and 8).
Figure 8 illustrates the zone-masking foil supplied. Remove one or more
segments that most closely match the lens segment of the offending zone
and affix to the inside surface of the lens. Note that the foil must be accurately
positioned so as not to affect adjacent zones. (Zone segments may be located
by holding the lens up to the light.) Any oil or grease on the surface of the
lens (or on your fingers) will reduce the adhesive quality of the foil. Important:
After the foil is properly applied, rub it down against the lens (using the tip of
a ball-point pen, for example) to improve surface contact.
If necessary, re-aim and retest the sensor after masking one or more zones.
Fig. 7. Zone-
masking foil
(shaded area)
applied to a
lens segment
to deactivate a
problem zone.
Also see Fig. 8.
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