1
OPERATION
MANUAL
Desktop
CO2,
Temperature
&
Relative
Humidity
Monitor
CO2METER.COM
INTRODUCTION
Thank
you
for
purchasing
this
desktop
CO2
monitor.
It
measures
carbon
dioxide
levels,
air
temperature
and
humidity.
This
makes
it
ideal
for
indoor
air
quality
(IAQ)
diagnosis
and
HVAC
system
performance
verification.
Poor
indoor
air
quality
is
considered
unhealthy.
It
can
lead
to
drowsiness,
inability
to
concentrate,
and
even
illness
(for
example,
Sick
Building
Syndrome).
IAQ
monitoring
of
CO2
levels
is
widely
used
in
public
areas
such
as
offices,
classrooms,
factories,
hospitals
and
hotels.
It
is
also
recommended
for
industrial
hygiene
in
some
countries.
(See
appendix).
Product
Features:
●
Large
display
shows
CO2
level,
temperature,
humidity,
date
and
time
●
15
degree
tilt
angle
makes
the
display
easy
to
see
and
read
●
Indoor
air
quality
level
indication:
Good,
Normal,
and
Poor
●
Stable
NDIR
sensor
for
CO2
detection
●
Visible
and
audible
CO2
warning
alarm
●
ABC
(Automatic
Baseline
Calibration)
or
manual
CO2
calibration
●
Maximum
or
minimum
CO2
level
recall
function
MATERIALS
SUPPLIED
This
package
contains:
●
Meter
●
Power
Supply
(5V
+/
‐
10%,
>=
0.5A)
●
Manual
POWER
SUPPLY
The
meter
is
powered
by
an
AC
adaptor
(5V/0.5A
output).
LCD
DISPLAY
Symbols
ppm
CO2
level
in
parts
‐
per
‐
million
GOOD
CO2
is
in
good
level
NORMAL
CO2
is
in
normal
level
POOR
CO2
is
in
poor
level
Air
Temp.
Air
temperature
Humidity
%
Unit
of
air
relative
humidity
o
E
(C/F)
Celsius/Fahrenheit
of
temp.
MAX/MIN
Maximum/Minimum
readings
CO2
alarm
icon
NOTE:
TWA
/
STEL
/
VENT.R
/
cfm/p
/
lps%
icons
are
not
used
for
this
model.
KEYPAD
SET
‐
Enter
setup
mode
‐
Save
and
finish
settings
ESC
‐
Exit
setup
page
/
mode
‐
Terminate
CO2
calibration
RESET
‐
Clear
MAX/MIN
values
▲
‐
Select
mode
or
increase
value
in
setup
MIN/MAX
▼
‐
Activate
MAX,
MIN
function
‐
Select
mode
or
decrease
value
during
setup
SET
+
▲
+
MIN/MAX
▼
‐
CO2
calibration
mode
OPERATION
POWER
ON/OFF
Plug
the
wall
adaptor
into
an
appropriate
receptacle.
The
meter
will
turn
on
automatically
after
a
short
beep.
The
lit
LED
indicates
full
power.
If
the
voltage
is
too
high
or
low,
“bAt”
will
display
on
the
LCD
and
the
LED
will
flash.
Please
see
page
14
for
trouble
shooting.
During
normal
operation,
the
LCD
will
display
the
current
CO2
level
in
ppm,
air
quality
level,
air
temperature,
humidity,
and
the
current
date
and
time
(Fig.1).
TAKING
MEASUREMENTS
The
meter
starts
taking
measurements
immediately
after
it
is
turned
on
and
updates
the
readings
every
second.
In
the
event
the
operating
environment
is
quickly
changed
(for
example,
from
high
to
low
temperature),
it
will
take
approximately
2
minutes
for
the
CO2
and
temperature
to
adjust
and
10
minutes
for
humidity
to
stabilize.
NOTE:
Do
not
hold
the
meter
close
to
your
face
as
your
breath
will
affect
the
CO2
level.
MIN/MAX
While
the
meter
is
powered
on,
press
the
“
MIN/MAX
▼
“
button
to
see
the
minimum
and
maximum
CO2
level,
temperature,
and
humidity
in
turn.
Each
press
of
“
MIN/MAX
▼
“
will
display
the
MIN
and
MAX
values
in
order,
then
return
the
meter
to
normal
mode
(Fig.2).
During
normal
operation
or
while
viewing
MIN/MAX
levels,
press
and
hold
the
“
RESET
“
key
for
more
than
1
second
to
clear
the
stored
minimum
and
maximum
values.
HIGH
CO2
ALARM
ALARM
The
meter
features
an
audible
alarm
that
warns
the
user
when
the
CO2
concentration
exceeds
the
programmed
limit.
Users
can
set
2
limits:
a
CO2
level
that
requires
ventilation
(See
P1.
3
in
setup
for
setting
alarm
limits)
and
a
lower
CO2
level
when
ventilation
is
no
longer
required
(See
P1.
2
in
setup
CO2
normal
limit).
During
high
alarm,
the
meter
emits
an
80dB
beep
and
displays
the
fan
icon
on
the
LCD.
The
alarm
can
be
temporarily
stopped
by
pressing
any
button,
or
it
will
automatically
stop
when
the
CO2
level
falls
below
the
lower
limit.
If
the
alarm
is
temporarily
silenced,
it
will
resume
if
the
CO2
level
fall
below
the
lower
limit
then
rises
above
the
upper
limit
again,
or
if
the
“
RESET
“
button
is
pressed
to
re
‐
activate
the
alarm.
