Sample Draw/Data Logger– Manual
CO2Meter.com
Rev. 27 October 2014
Pg. 11 of 15
Calibrating using MODBUS or PC Connection
Download
the
software
directly
from
this
link
in
our
website.
http://www.co2meter.com/pages/downloads
More
precise
calibrations
can
be
performed
using
the
PC
connection.
The
unit
can
be
attached
to
a
PC
using
an
optional
USB
to
RS
‐
485
cable,
available
on
our
website,
or
via
a
mini
‐
USB
cable
to
the
internal
USB
connection.
In
the
desktop
software
application
O2
can
be
calibrated
individually.
The
O2
sensor
can
be
calibrated
to
0%
and
then
to
20.9%.
During
normal
operation
0%
calibration
of
the
oxygen
transmitter
should
not
be
necessary.
Calibration
can
also
be
performed
over
MODBUS.
See
additional
documentation
for
MODBUS
registers.
Calibration
can
be
performed
using
either
0%
CO2
calibration
gas
(typically
nitrogen,
Argon,
etc.),
or
using
a
fresh
source
of
outdoor
air,
assumed
to
be
approximately
20.9%
O2.
Start
by
attaching
the
calibration
gas
to
the
meter
and
connecting
the
meter
to
a
personal
computer.
Open
the
calibration
screen
in
the
GasLab
®
software.
Click
the
“Calibrate”
button
in
the
calibration
tab
for
the
desired
gas,
located
in
the
“Configure
Sensor”
screen.
As
long
as
the
gas
concentration
is
stable,
the
unit
should
instantly
reflect
the
calibrated
value.
This
can
be
confirmed
by
watching
the
display.
To
see
the
calibration
value
in
real
time,
click
in
the
“Collect
Real
time”
button
