EXTECH
INSTRUMENTS
7
CO50
‐
en
‐
GB_V1.2
12/14
MANUALLY
STORE/RECALL
99
CO
READINGS
The
CO50
can
manually
store
a
CO
reading
with
a
press
of
the
SEL/RECALL
button.
The
LCD
shows
the
current
record
number
(01
‐
99)
in
the
humidity
reading
area
each
time
a
reading
is
manually
stored
(a
short
beep
will
sound
each
time
a
reading
is
stored
also).
To
recall
stored
readings,
press
and
hold
the
SEL/RECALL
Button,
the
LCD
shows
the
number
of
the
record
with
its
CO
reading,
to
scroll
other
stored
readings
use
the
▲
and
▼
buttons.
To
clear
stored
data:
Access
the
Recall
mode
and
press
and
hold
the
SET
button
until
“Clr
“appears
on
LCD.
The
LCD
automatically
returns
to
normal
mode.
The
illustration
below
on
the
left
shows
a
manually
recorded
reading
(reading
number
‘05’
in
this
case);
the
middle
illustration
shows
the
recalled
reading;
the
illustration
on
the
right
shows
readings
cleared.
CO
CALIBRATION
It
is
recommended
that
the
meter
be
calibrated
monthly
in
a
clean
air
environment.
From
the
normal
measurement
mode,
press
and
hold
the
MODE
▼
button
for
at
least
6
seconds
to
enter
calibration
mode.
The
LCD
shows
CAL
and
a
number
representing
the
time
remaining
in
the
calibration
(15
seconds).
The
meter
returns
to
the
normal
measurement
mode
automatically
when
calibration
is
complete.
Warning:
Ensure
that
no
CO
concentration
is
present
while
calibrating.
Reading
stored
Reading
Recalled
Reading
Cleared
