EXTECH
INSTRUMENTS
4
CO50
‐
en
‐
GB_V1.2
12/14
Operation
POWER
THE
METER
Plug
the
AC
adaptor
into
meter
and
receptacle
to
turn
on
the
meter.
Reset
the
date
and
time
each
time
the
meter
power
is
cycled.
Remove
the
adaptor
or
switch
off
the
AC
power
source
to
shut
down
the
meter.
GETTING
STARTED
All
LCD
display
lines
will
switch
ON
when
power
is
applied
to
meter.
The
LED
indicator
will
also
be
ON
steady
with
an
orange
color.
The
display
will
now
auto
zero.
Auto
zero
takes
approximately
60
seconds
and
then
the
meter
counts
down
from
9
to
0.
The
meter
is
now
in
the
normal
operating
mode.
When
attempting
to
manually
store
the
current
CO
reading,
the
LED
light
turns
green
for
one
second
and
a
short
beeper
tone
will
sound.
The
LCDs
show
the
current
CO
value
in
ppm
(top),
ambient
temperature/relative
humidity
(middle),
and
the
date
and
time
(bottom).
Toggle
the
temperature
units
by
pressing
and
holding
the
C/F/%RH
▲
button.
SETTING
DATE/TIME
In
normal
operation,
the
meter
alternates
the
date
and
time
displays.
Press
the
SET
button
to
switch
between
the
12
‐
hour
system
(am/pm)
and
the
24
‐
hour
system.
Note
that
the
default
time
display
is
a
24
‐
hour
clock
format.
1.
Press
and
hold
SET
for
3
seconds
to
see
image
at
right.
2.
Press
▼
to
decrease
a
number
or
press
▲
to
increase
a
number
3.
Press
SEL/RECALLECALL
to
scroll
through
the
YEAR
‐
MONTH
‐
DAY
4.
When
finished
changing
the
Date,
press
SET
to
change
the
Time
5.
Press
▼
to
decrease
number
or
press
▲
to
increase
number
6.
Press
SEL/RECALLECALL
to
scroll
through
HR
‐
MIN
‐
SEC
7.
Press
SET
to
access
the
alarm
setting
(see
Alarm
section).
8.
To
exit,
press
and
hold
SET
for
3
seconds.
