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20.2 Alarm messages and sounds.
20.2.1 Alarm messages.
Alarm messages ranked in order of priority. The current message of highest priority ranking
is stored in the history log. Simultaneous lower ranking messages are often the
consequence of a higher priority, and they are not stored in the history log. The term ‘alarm’,
when used in the Action column, means sounding and displaying a conforming audio-visual
alarm.
20.2.1.1 Latching and non latching alarms
A latching alarm is an alarm message that once generated will continue to display both the
audible and visual elements even though the original alarm condition has cleared.
A non latching alarm is an alarm message that will display both the audible and visual
elements only during the alarm condition. If the alarm condition clears the audible and visual
elements self cancel.
Alarm message Description Action
Simultaneous ‘Battery
Error’ and ‘Mains
disconnect’
(blank display)
Total power loss. Battery has
emptied or battery fuse has failed,
while in battery operating mode.
The 1 to 2 l/min bypass air flow will
cease once the volume chamber is
empty.
Priority: HIGH
Type: TECHNICAL
Device appears as switched
off. Normal alarm system
and history log is
inoperable.
Power manager sounds
backup sounder
continuously, while backup
capacitor power exists
(approx 10 minutes), or until
user presses power ON-
OFF button.
Remove the unit from
service.
Calib Faulty Calibration integrity error
Latching HIGH priority alarm.
Cannot be disabled.
Priority: HIGH
Type: TECHNICAL
Remove patient to an
alternative form of
ventilation. Remove the unit
from service.
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