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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 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 prescribe time it will be assumed that the controller
sub-system is not functioning properly and the “Controller Error” 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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