68 7 Alarms
fabian +nCPAP evolution | SW V5.1.x
Ref: 122003.EN / Date : 26Jan2021
7.4.2 Pressure release behaviour
In case of detected obstruction of the breathing tubes, the ventilator alarms and also ceases gas
flow to the outlet, and opens the exhalation valve to reduce the pressure in the breathing circuit
to ambient pressure (ZEEP). The tube obstruction alarm is terminated once the airway pressure
measured by the proximal pressure sensor has fallen below set PEEP and the time of the next
breath trigger is reached.
This pressure relief occurs:
• 12 mbar above the set PIP in IPPV, SIPPV, SIMV, SIMV+PSV, PSV and CPAP modes.
• 10 mbar above the set PIP in NCPAP and DUOPAP modes.
In case of detected high inspiratory pressure, the ventilator alarms and switches to the
expiratory phase – the exhalation valve pressure control is reduced to PEEP, and the outlet gas
flow is switched from I-Flow to E-Flow. Only if this subsequently transitions to a tube obstruction
alarm, the outlet flow is switched off and exhalation valve opened as above.
7.4.3 Application error
If the device software encounters an unexpected ERROR, a window appears in the middle of the
screen with the following text in English: “Application fabian.exe encountered a serious Error
and must shut down.”
Figure 7-4: Application error displayed
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