Sampling Data Logger User Manual
CO2Meter
PAGE
9
of
16
Powering
the
Unit
These
meters
have
a
switch
on
the
front
dedicated
to
enabling/disabling
data
logging
(right
on
Figure
above)
and
another
dedicated
to
powering
the
unit
(left
on
Figure
above).
As
long
as
the
unit
is
connected
to
an
appropriate
power
source
and
the
power
switch
is
in
its
ON
position,
the
unit
will
be
operating
properly.
LCD
Display
(if
applicable)
The
Liquid
Crystal
Display
(LCD)
screen
shows
the
following
features:
CO2
in
parts
‐
per
‐
million
(ppm)
for
1%
and
5%
models
CO2
in
percentage
format
(##.##%)
for
30%,
65%,
100%
Logging
On/Off
Percentage
of
memory
free
Usage
(Pump
only)
In
order
to
use
the
unit,
hoses/tubing
must
be
attached
to
the
inlet
and
outlet
fittings
on
the
front
of
the
unit.
The
pump
will
draw
air
from
the
inlet
in
a
vacuum
configuration,
push
it
through
the
sensing
chamber,
and
exhaust
the
air
out
through
the
outlet.
Closed
Loop
Operation
Figure
5:
Closed
loop
sampling
setup
Open
Loop
with
Environmental
Exhaust
Figure
6:
Opened
loop
sampling
setup
