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24. Alarms
24.1 Alarm Protocols
The following descriptions summarizes the alarms to be generated by the
ventilator. The alarms are sorted by their priority ratings. An alarm of a higher
priority can interrupt a lower priority alarm, effectively, masking lower priority
alarms. Upon the generation of alarms a message indicating the type of alarm will
be displayed and then an audible alarm with the correct priority level is generated.
Some alarms are mutable, the mute interval being 1 minute.
24.2 Alarm Sounds
The ventilator produces four types of alarm tones. Three pulsed tones and one
continuous.
The three pulsed tones correspond to the alarm sounder priorities, High, Medium
and Low.
The pulsed tones are generated when the ventilator encounters an alarm
condition. All the generated pulsed tone alarms are accompanied by visual alarm
indication.
The High alarm sounder consists of 3 bleeps followed by 2 bleeps which is
repeated once with a 10 second gap before restarting.
The Medium alarm sounder consists of 3 bleeps followed by a 20 second gap.
The Low alarm sounder consists of 1 bleep followed by a 10 second gap.
In Ventilation Off mode or when the ventilator is set to Standby all alarm sounds
are muted to the minimum setting (1).
When changing between modes, for any alarms that have been triggered the
alarm sounder volume is set to its minimum setting, for a period of 10 seconds.
After the 10 seconds has expired the volume will return to the user set value.
Note: In a mains power fail situation the user will hear two high priority
alarms. The ventilator’s power supply generates its own alarm as a backup
to the main alarm. The difference between the two sounds is that the power
supply alarm is of a higher pitch.
The continuous tone is generated in a complete power fail situation, where the
mains supply and the back-up battery supply both fail.
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