Sample Draw/Data Logger– Manual
CO2Meter.com
Rev. 27 October 2014
Pg. 10 of 15
Theory of Operation
The
zirconia
oxygen
sensor
utilizes
solid
‐
state
electrochemical
reactions
to
produce
a
voltage
proportional
to
the
current
oxygen.
This
voltage
is
then
digitalized
and
filtered
to
a
usable
value.
The
oxygen
sensor
has
also
been
factory
calibrated
to
meet
specifications.
Calibration
The
calibration
process
varies
depending
on
the
type
of
unit
and
whether
it
has
optional
data
logging
functionality
or
not.
All
units
are
factory
‐
calibrated
with
multiple
reference
points
of
gas,
and
have
been
verified
to
be
accurate
within
their
specific
functionality
before
shipment.
However,
if
the
unit
is
severely
jolted
or
otherwise
mechanically
disturbed,
the
sensor
can
drift,
requiring
recalibration.
All
calibration
procedures
follow
a
single
‐
point
calibration
routine
that
effectively
shifts
the
zero
‐
point
of
the
O2
sensor.
