Monitoring
124
Instructions for use Fabius plus SW 3.n
Calibrating the O
2
sensor
The O
2
sensor must be exposed to the ambient air
during the entire calibration. The calibration of the
O
2
sensor is done in the scope of the daily
checkout of the readiness for operation of Fabius.
The O
2
sensor can be calibrated in the following
ventilation modes:
– In
Standby
mode, see chapter ''Calibrating the
O
2
sensor'' on page 134.
– During ventilation (in all available ventilation
modes), see chapter ''Calibrating the O
2
sensor'' on page 149.
Consequences of incorrect O
2
calibration
If the O
2
sensor is not correctly calibrated, it can
lead to faulty measurements. With an air mixture
with too high or too low O
2
concentration, Fabius
does not perform a calibration completely.
However, if the deviating concentration is within
defined limits, Fabius completes the calibration
even with non-optimal conditions. This can have
the consequence that the displayed, measured
sensor values indicate an O
2
percentage that is
higher or lower than the actual percentage. During
the entire calibration, it must therefore be ensured
that the O
2
sensor is only exposed to ambient air.
The diagram illustrates the correlation between the
air mixture during calibration and the accuracy of
the oxygen measurement.
A
Displayed O
2
percentage
B
Actual O
2
percentage
C
During calibration, the sensor was exposed to
ambient air with <21 % O
2
. Therefore, the
displayed O
2
percentage is higher than the
actual O
2
percentage.
D
Correct calibration with ambient air (21 % O
2
)
during the entire calibration time period.
Displayed O
2
percentage = actual O
2
percentage
E
During calibration, the sensor was exposed to
ambient air with >21 % O
2
. Therefore, the
displayed O
2
percentage is lower than the
actual O
2
percentage.
20957
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
A
B
C
D
E