10-12 624074/07
10 Responding to alarms
Automatic
calibration
Operator Message. Autozero of
pressure sensors is in progress.
Curve display may be inter-
rupted.
No action required.
NOTE:
During ventilation the device periodically performs an
autocalibration (autozero) function to “zero” or adjust
the device's pressure sensors to a zero value. This is
controlled periodically by applying ambient pressure to
the sensor, measuring the pressure, comparing it to the
expected ambient pressure, and making an internal
correction to remove pressure sensor drift due to tem-
perature changes or other factors. Autocalibration is
performed automatically at defined intervals.
Breath
detected
within 20 s
Operator message. A CO
2
sen-
sor/adapter calibration was
attempted, but insufficient time
has elapsed since last patient
breathing effort.
Ensure the sensor and air-
way adapter are removed
from the breathing circuit.
Wait at least 20 seconds;
then recalibrate.
Brightness
test alarm
Medium priority.
Alarm is shown while changing
the alarm lamp brightness.
none
Calibration
faulty
Operator message The flow sen-
sor calibration could not be per-
formed.
Repeat the calibration. If
the message is displayed
again, install a new flow
sensor.
Calibration
in progress
Operator message. An operator-
initiated calibration is in progress.
Wait.
Table 10-2. Alarms and other messages
Alarm Definition Complete these actions
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