Sampling Data Logger User Manual
CO2Meter
PAGE
12
of
16
FIF
Figure
9:
Data
logger
calibration
screen
for
0
‐
1%
CO2
Calibration
Procedure
To
calibrate
your
unit,
follow
these
steps:
1.
Expose
the
unit
to
ambient
air
(assumed
to
be
at
400ppm)
or
connect
it
to
a
calibration
gas
bottle/cylinder
(100%
nitrogen
or
argon)
with
the
appropriate
demand
regulator.
2.
Wait
25
seconds
to
collect
a
sample.
Write
down
this
value
as
the
“before”
value.
3.
Click
the
“Calibrate”
button
after
selecting
your
calibration
gas.
4.
Wait
25
seconds
again.
This
time,
the
unit
will
take
a
sample
and
use
this
data
to
adjust
zero
values.
The
displayed
measurements
will
reflect
the
new
calibration
value
(0
or
400ppm).
5.
Disconnect
the
calibration
gas
and
wait
25
seconds.
The
newly
displayed
data
will
now
reflect
the
new
sensor
calibration.
If
the
sensor
is
still
operating
outside
of
its
specified
range,
repeat
this
procedure.
When
the
readings
vary
too
greatly,
the
calibration
will
silently
fail
and
may
need
to
be
performed
again.
0
‐
5%,
65%,
100%
Sampling
Unit
with
or
without
Data
Logging
These
units
do
not
feature
Automatic
Background
Calibration
(ABC)
algorithm
due
to
the
CO2
scale
they
measure.
To
ensure
the
highest
accuracy,
we
recommend
calibrating
these
units
with
calibration
gas
(nitrogen
for
zero,
or
CO2),
close
to
the
concentration
being
measured.
Alternatively,
a
0%
or
ambient
calibration
can
be
performed.
To
perform
a
calibration,
attach
the
unit
to
your
computer,
power
it
and
either
expose
it
to
atmosphere
or
supply
it
with
your
calibration
gas,
fed
with
a
demand
‐
based
regulator.
