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26.3 Alarm descriptions and actions to
be taken
Alarm 1. Monitor Failure
Alarm message.................... Monitor EEPROM
Fail
Alarm sub message............. Remove ventilator
from service
Priority of alarm ................... 1
Monitor mode....................... None
Can alarm be muted ........... No
Sounder Priority................... High
Alarm Description:
If the monitor system fails this alarm is generated
by the controller system.
Action: Remove patient to alternative form of
ventilation, then remove ventilator from
service.
Alarm 2. Sustained Sub-ambient Pressure
Alarm message.................... Sustained Sub
Ambient Pressure
Alarm sub message............. Safety shutdown
activated and
ventilation restarting
Priority of alarm ................... 2
Monitor mode....................... All
Can alarm be muted ........... No
Sounder Priority................... High
Alarm Description:
If the proximal pressure falls below -2mbar for
>50ms a Sub-Ambient Pressure alarm is
generated and a message will be sent to the
control sub-system to shut off all gasses. If the
gas is not cut off during the next 50ms the
monitor will intervene and cut all the gasses.
Fresh gas is reinstated after 6 seconds ventilation
restarted after a further 2 seconds.
In all HFO modes it is the mean pressure that is
checked for sub-ambient level.
Action: Remove patient to alternative form of
ventilation, then remove ventilator from
service.
Alarm 3. Sub-Ambient Pressure
Alarm message.................... Sub Ambient
Pressure
Alarm sub message ............. Safety shutdown
activated and
ventilator restarting
Priority of alarm.................... 3
Monitor mode....................... All
Can alarm be muted ........... No
Sounder Priority ................... High
Alarm Description:
If the proximal pressure falls below -2mbar for
<50ms a Sub-Ambient pressure alarm is
generated but mean pressure is maintained.
Fresh gas maintained for 6 seconds ventilation
restarted after a further 2 seconds.
In all HFO modes it is the mean pressure that is
checked for sub-ambient level.
Action: Check patient. Adjust ventilation
parameters. If a alarm continues to be
triggered remove patient to alternative form of
ventilation, then remove ventilator from
service.
Alarm 4. Controller Failure
Alarm message.................... Controller Failure
Alarm sub message ............. REMOVE
VENTILATOR
FROM SERVICE
Priority of alarm.................... 4
Monitor mode....................... All
Can alarm be muted ........... No
Sounder Priority ................... High
Alarm Description:
The controller sub-system sends life-ticks at
regular intervals to the monitor. If the above life
ticks are interrupted for more than a prescribed
time it will be assumed that the controller sub-
system is not functioning properly and the
“Controller Failure” alarm will be generated. Any
system error message received from the
controller will also activate this alarm.
After the generation of the alarm all gasses to the
patient will be cut-off.
Action: Remove patient to alternative form of
ventilation, then remove ventilator from
service.
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