EXTECH
INSTRUMENTS
7
IR255
‐
en
‐
EU_V1.4
9/14
Measurement
Notes
1.
The
object
under
test
should
be
larger
than
the
spot
(target)
size
calculated
by
the
field
of
view
diagram.
2.
If
the
surface
of
the
object
under
test
is
covered
with
frost,
oil,
grime,
etc.,
clean
before
taking
measurements.
3.
If
an
object's
surface
is
highly
reflective
apply
masking
tape
or
flat
black
paint
to
the
surface
before
measuring.
4.
The
meter
may
not
make
accurate
measurements
through
transparent
surfaces
such
as
glass.
5.
Steam,
dust,
smoke,
etc.
can
obscure
measurements.
6.
The
meter
compensates
for
deviations
in
ambient
temperature.
It
can,
however,
take
up
to
30
minutes
for
the
meter
to
adjust
to
extremely
wide
ambient
temperature
changes.
7.
To
find
a
hot
spot,
aim
the
meter
outside
the
area
of
interest
then
scan
across
(in
an
up
and
down
motion)
until
the
hot
spot
is
located.
Maintenance
Cleaning
To
clean
the
lenses
use
compressed
air
to
clear
dust
and
other
particles,
then
carefully
clean
with
a
wet
cotton
swab.
The
cotton
swab
should
be
moistened
with
clean
water.
To
clean
the
meter
housing,
wipe
with
a
damp,
soft
cloth.
Do
not
use
solvents
or
abrasives.
Do
not
immerse
the
IR255
in
water
or
other
liquid.
Troubleshooting
Symptom
Problem
Action
OL
display
Target
temperature
exceeds
range
Select
a
target
within
range
‐
OL
display
Target
temperature
under
‐
range
Select
a
target
within
range
Battery
icon
flashes
Low
Battery
power
Replace
Battery
Blank
display
screen
Low
battery
power
Check
and/or
replace
battery
No
Laser
pointer
Low
battery
or
environmental
temperature
higher
than
40°C
(104°F)
Replace
the
battery
or
move
the
IR255
to
an
area
with
a
lower
ambient
temperature
