Installation
5
Installation
5.1
Positioning
Sensor
location
depends
on
the
application.
Before
deciding
on
a
location,
you
need
to
be
aware
of
the
ambient
temperature
of
the
location,
the
atmospheric
quality
of
the
location,
and
the
possible
electromagnetic
interference
in
that
location,
according
to
the
sections
described
above.
If
you
plan
to
use
air
purging,
you
need
to
have
an
air
connection
available.
Wiring
and
conduit
runs
must
be
considered,
including
computer
wiring
and
connections,
if
used.
5.1.1
Distance
to
Object
The
desired
spot
size
on
the
target
will
determine
the
maximum
measurement
distance.
To
avoid
erroneous
readings
the
target
spot
size
must
completely
fill
the
entire
field
of
view
of
the
sensor.
Consequently,
the
sensor
must
be
positioned
so
the
field
of
view
is
the
same
as
or
smaller
than
the
desired
target
size.
For
a
list
indicating
the
available
optics,
see
section
3.2
Optical
Specifications
on
page
6.
The
actual
spot
size
for
any
distance
can
be
calculated
by
using
the
following
formula.
Divide
the
distance
D
by
your
model’s
D:S
number.
For
example,
for
a
unit
with
D:S
=
10:1,
if
the
sensor
is
400
mm
(15.7
in.)
from
the
target,
divide
400
by
10
(15.7
by
10),
which
gives
you
a
target
spot
size
of
approximately
40
mm
(1.57
in.).
14
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