PBI Dansensor CheckPoint O2/CO2, Manual

Page: 14 / 53

PBI-Dansensor A/S COPYRIGHT © PBI-200616-G 03/2010
CheckPoint O
2
/CO
2
EN User Manual 13
Calibration
CheckPoint O
2
/CO
2
can be calibrated with
atmospheric air (20.9 % O
2
), 0 % CO
2
and
100 % CO
2
.
If CheckPoint does not show approx. 20.9
% O
2
(between 21.3 % and 20.5 %) when
measuring atmospheric air, calibrate
CheckPoint with atmospheric air.
If CheckPoint indicates a value that
deviates by more than 2-3 % when
measuring gas with a known CO
2
content,
calibrate CheckPoint with 0 % CO
2
or 100
% CO
2
.
Calibration with air (20.9 % O
2
):
The needle must only suck air when
calibrating with air.
Calibration with 0 % CO
2
and 100 % CO
2
:
Before calibrating with 100 % CO
2
you
must calibrate with 0 % CO
2
. The
calibration gas must not be forced through
the CheckPoint. Let the needle suck the
gas from an overflow to which between 0.2
and 1.0 l/min is supplied.
Note: In connection with 0 % CO
2
calibration, 100 % N
2
and air with a known
content can be used. When using
atmospheric air for 0 % CO
2
, please ensure
that there are no increased or unstable
CO
2
concentrations in the air, as this may
result in erroneous measuring at relatively
high CO
2
measurements. Carry out any
such calibration far away from the CO
2
application area, and ventilate CheckPoint
thoroughly using atmospheric air by
carrying out 5 measurements with "clean"
atmospheric air before calibrating with 0 %
CO
2
.
Start calibration
‚
(2) +
–
(3) :
Press the
‚
key, and hold it down. Press
–
, and release both keys. Throughout the
calibration process the CheckPoint
measures the calibration gas and
automatically determines whether 20.9 %
O
2
, 0 % CO
2
or 100 % CO
2
is being
supplied.
CheckPoint shows the calibration gas
supplied in the display: In case of 20.9 %
O
2
it switches between "CAL." and "20.9",
in case of 0 % CO
2
it switches between
"CAL." and "0.0", and in case of 100 % CO
2
it switches between "CAL." and "100".
Check that CheckPoint has determined the
calibration gas supplied. If CheckPoint has
chosen the wrong calibration gas it is
important to interrupt the calibration
process or manually select the correct
calibration gas. Calibration takes 25
seconds.
Manual selection of calibration gas
When calibrating, you can select the
calibration gas (20.9 % O
2
, 0 % CO
2
or 100
% CO
2
) manually by pressing
‚
+
–
again.
Pressing
‚
+
–
switches between the
gases.
Stop calibration
Press
Ê
to interrupt the calibration
process.