Monitoring
124 Instructions for use Fabius plus SW 3.n
Calibrating the O2 sensor
The O2 sensor must be exposed to the ambient air
during the entire calibration. The calibration of the
O2 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 O2
calibration
If the O2 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 O2 percentage.
D Correct calibration with ambient air (21 % O
2)
during the entire calibration time period.
Displayed O
2 percentage = actual O2
percentage
E During calibration, the sensor was exposed to
ambient air with >21 % O
2. Therefore, the
displayed O2 percentage is lower than the
actual O
2 percentage.
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