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27
SENSORS
CALIBRATION
CALIBRATION CO
2
CO
2
850 ppm
<ESC> exit/cancel
<ENTER> confirm
The instrument display shows the measured CO
2
.
The CO
2
sensor can be calibrated:
•
at 400ppm in clean air
•
at 0ppm with nitrogen bottles (code MINICAN.12A).
The instrument can automatically detect the calibration methods used: whether 400ppm or 0ppm.
The calibration should be performed at one point only: each new calibration cancels the previous
one.
Proceed as follows:
1.
Unscrew the hexagon slot peg located in front of the
instrument. In the place of the peg, screw the small metal tube
at the end of the plastic tube connecting to the bottle for
calibration MINICAN.12A.
2.
Let the inlet open if you want to perform a calibration at 400
ppm: For this second calibration procedure,
ensure the
instrument is really in clean air.
3.
For the calibration at 0 ppm, after connecting the CO
2
input to
the small tube from the nitrogen bottle, adjust the bottle flow
meter to get a constant flow from 0.3 to 0.5 l/min.
4.
Wait about 15 minutes before continuing.
5.
Supply CO
2
for at least 2 minutes so as to stabilize the
measurement.
6.
Press ENTER on the instrument. After few seconds, the new
value read by the probe will appear. Wait the two minutes necessary for calibration without
changing the working conditions.
7.
At the end, close the bottle spigot, unscrew the small tube from the instrument and close the
hole using the M6 hexagon slot peg.
Input for
CO
2
calibration
