Copyright © 2015 Nortek Security & Control LLC 3
Environmental and Other Useful Information
While
the
PIR
is
a
highly
reliable
intrusion
detection
device,
it
does
not
guarantee
against
burglary.
Any
intrusion
device
is
subject
to
a
“failure
to
warn”
for
a
variety
of
reasons.
Consider
the
following
when
installing
and
setting
up
the
PIR:
1
This
PIR
has
built
‐
in
protection
to
keep
bugs
from
getting
into
the
sensor
area
and
causing
false
alarms.
Note
that
this
protection
does
not
prevent
insects
from
crawling
across
the
lens
of
the
PIR,
which
could
trigger
the
PIR.
2
Infrared
energy
can
be
reflected
off
any
glossy
surfaces
such
as
mirrors,
windows,
floors,
or
counter
tops
with
glossy
finish,
and
slick
‐
finished
concrete.
Some
surfaces
reflect
less
than
others
(e.g.
the
PIR
can
see
a
change
in
infrared
energy
off
of
reflective
surfaces
even
if
the
heat
or
cold
source
is
not
within
the
PIR
detection
pattern).
3
Windows
reflect
infrared
energy.
They
also
allow
sunlight
or
light
from
other
sources
(e.g.,
cars)
to
pass
through
to
the
PIR.
The
PIR
can
detect
these
changes
in
infrared
energy.
For
example,
if
sunlight
passing
through
a
window
shines
onto
a
hardwood
floor
and
the
change
in
infrared
energy
is
quick
enough,
the
PIR
can
trigger
an
alarm.
The
same
applies
if
the
PIR
area
includes
a
window,
even
though
the
pattern
of
protection
cannot
“see”
through
glass.
Lights
from
a
passing
car
can
also
pass
through
the
window
at
night
and
shine
directly
into
the
PIR’s
lens.
4
Heating
and
air
conditioning
ducts
are
also
important
because
if
they
blow
air
onto
an
object
within
the
field
of
the
PIR’s
view,
the
temperature
of
that
object
could
change
quickly
enough
for
the
PIR
to
“see”
a
change
in
infrared
energy.
PIR’s
cannot
see
air
current,
only
the
change
in
temperature
of
a
physical
object
.
5
The
PIR
senses
change
in
temperature.
However,
as
the
ambient
temperature
of
the
protected
area
approaches
the
temperature
range
of
95°
to
120°
F,
the
detection
performance
of
the
PIR
decreases.
6
Ensure
that
the
area
you
wish
the
PIR
to
cover
is
free
of
obstructions
(for
example,
curtains,
screens,
plants,
and
so
on.)
that
may
block
the
pattern
of
coverage.
7
Anything
that
can
sway
or
move
due
to
air
current
can
cause
a
change
in
infrared
energy
within
the
fields
of
view.
Drafts
from
doors
or
windows
can
cause
this
to
happen.
Plants,
balloons,
curtains,
and
hanging
baskets
should
never
be
left
in
the
PIR’s
field
of
view.
8
Do
not
mount
the
PIR
on
a
surface
that
allows
for
any
vibration.
Vibrations
not
only
cause
the
PIR
to
move
a
little,
but
it
also
causes
the
fields
of
view
in
a
room
to
move
with
respect
the
PIR.
A
little
vibration
can
cause
havoc
with
the
PIR’s
field
of
view,
thus
the
PIR
may
see
a
change
in
energy
and
trigger
the
alarm.
9
An
installation
often
requires
that
the
PIR
is
aimed
at
the
door.
The
PIR
may
detect
door
movement
before
the
door
contact
can
initiate
an
entry
delay,
causing
the
alarm
to
trigger.
If
you
install
the
PIR
facing
a
door,
then
while
programming
the
PIR,
choose
an
appropriate
sensor/zone
type.
10
The
PIR
ONLY
detects
intrusion
within
the
pattern
of
coverage.
11
The
PIR
does
not
provide
volumetric
area
protection.
12
The
PIR
creates
multiple
beams
of
protection.
Intrusion
can
only
be
detected
in
unobstructed
areas
covered
by
those
beams.
13
The
PIR
cannot
detect
motion
or
intrusion
that
occurs
behind
walls,
ceilings,
floors,
closed
doors,
partitions,
glass
doors,
or
windows.
14
Tampering
with,
masking,
painting,
or
spraying
of
any
material
on
the
PIR
lens
or
any
part
of
the
optical
system
can
impair
detection
ability.
15
The
PIR,
like
other
electrical
devices,
are
subject
to
component
failure.
Even
though
the
PIR
is
designed
to
last
as
long
as
10
years,
the
electronic
components
are
subject
to
failure.
Lens Pattern and Tilt Angles
The
diagrams
below
show
the
lens
pattern
and
tilt
angles
for
the
PIR
in
meters.
Figure 5
Lens Pattern—Top View
Figure 6
Tilt Angle—Side View
‐
9°
PIR
titled
down
one
click
0°
PIR
facing
the
opposite
wall
(Direct
‐
to
‐
wall
or
mounting
bracket
with
no
tilt
adjustment.
‐
18°
PIR
tilted
down
two
clicks
+9°
PIR
tilted
up
one
click
