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26. Alarms
26.1 Alarm Protocols
The following descriptions summarize the alarms to
be generated by the ventilator. The alarms are
sorted by their priority ratings. An alarm of a high
priority can interrupt a medium priority alarm,
effectively, masking medium 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.
26.2 Alarm Sounds
The ventilator produces three types of alarm tones.
Two pulsed tones and one continuous.
The two pulsed tones correspond to the alarm
sounder priorities, High, and Medium.
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 ventilator has no low priority alarms.
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.
26.2.1 Un-recognized alarm condition
The ventilator can display an unrecognized alarm
condition. This will be displayed as “- - 00" in the
alarm history.
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