Sensor
Location
Marathon
Series
FA/FR
13
4
Sensor
Location
Sensor
location
and
configuration
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
(especially
for
1
‐
color
temperature
measurements),
and
the
possible
electromagnetic
interference
in
that
location
(a
consideration
only
for
the
electronics
enclosure).
If
you
plan
to
use
air
purging,
you
need
to
have
an
air
connection
available.
Also,
wiring
and
conduit
runs
must
be
considered,
including
computer
wiring
and
connections,
if
used.
The
following
subsections
cover
topics
to
consider
before
you
install
the
sensor.
4.1
Ambient
Temperature
The
optical
head
is
designed
to
operate
in
ambient
temperatures
up
to
200°C
(390°F).
The
electronics
enclosure
is
designed
to
operate
in
ambient
temperatures
between
0°C
(32°F)
and
60°C
(140°F).
The
internal
ambient
temperature
can
vary
from
10°C
(50°F)
to
68°C
(154°F).
Internal
temperatures
outside
this
range
will
cause
a
failsafe
error.
4.2
Atmospheric
Quality
Smoke,
fumes,
dust,
and
other
contaminants
in
the
air,
as
well
as
a
dirty
lens
are
generally
not
a
problem
when
using
the
2
‐
color
mode
(as
long
as
the
attenuation
is
equal
in
both
spectral
bands).
However,
if
the
lens
gets
too
dirty,
it
cannot
detect
enough
infrared
energy
to
measure
accurately,
and
the
instrument
will
indicate
a
failure.
It
is
good
practice
to
always
keep
the
lens
clean.
The
Air
Purge
Collar
helps
keep
contaminants
from
building
up
on
the
lens.
If
you
use
air
purging,
make
sure
an
air
supply
with
the
correct
air
pressure
is
installed
before
proceeding
with
the
sensor
installation.
4.3
Electrical
Interference
To
minimize
electrical
or
electromagnetic
interference
or
“noise”
be
aware
of
the
following:
•
Mount
the
electronics
enclosure
as
far
away
as
possible
from
potential
sources
of
electrical
interference
such
as
motorized
equipment
producing
large
step
load
changes.
•
Use
shielded
wire
for
all
input
and
output
connections.
•
Make
sure
the
shield
wire
from
the
electronics
to
terminal
block
cable
is
earth
grounded.
•
For
additional
protection,
use
conduit
for
the
external
connections.
Solid
conduit
is
better
than
flexible
conduit
in
high
noise
environments.
•
Do
not
run
AC
power
for
other
equipment
in
the
same
conduit.
When
installing
the
optical
head,
check
for
any
high
‐
intensity
discharge
lamps
or
heaters
that
may
be
in
the
field
of
view
(either
background
or
reflected
on
a
shiny
target)!
Reflected
heat
sources
can
cause
a
sensor
to
give
erroneous
readings.
4.4
Distance
to
Object
The
requested
spot
size
determines
the
maximum
distance
to
the
measurment
object
and
the
necessary
focus
of
the
optic.
The
Standard
Focus
is
set
at
infinity.
The
Close
Focus
optical
heads
are
focused
at
100
mm
(4
in)
or
300
mm
(12
in),
see
section
3.5
Optical
Specifications
,
p.
9.