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Airvo 3 - USER MANUAL | A - 41
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9.4.2 SpO
2
Alarm Delay
The SpO
2
Alarm Delay setting defers the audible Low SpO
2
and High SpO
2
alarms for up to 15 seconds. This delay helps reduce non-
actionable alarms for short desaturations. The audible alarm will start, if the alarm condition remains, after the delay.
9.4.3 Alarm response time
Audible and visual alarms are subject to an alarm response delay. The alarm response delay has three parts, the:
1. Alarm condition delay: the duration for a physiological change to be recognized by pulse oximetry,
2. Alarm signal generation delay: the period between detecting a condition and signaling the alarm, and
3. Alarm reporting delay: the period between receiving an alarm signal from a monitoring device and reporting the alarm to the user.
Measurement averaging will affect the signal generation delay: a larger Averaging Time will increase the signal generation delay. These
delay concepts are illustrated on the graph below for a decrease in SaO
2
leading to a SpO
2
Low alarm as an example. The illustration does
not reflect the actual length of delays. Refer to ISO 80601-2-61 for more information about alarm response delays.
SpO
2
reaches
alarm threshold
SaO
2
reaches
alarm threshold
Low SpO
2
alarm raised
Time
Alarm condition delay
Alarm signal generation delay
Alarm reporting delay
Total alarm system delay
Low SpO
2
alarm threshold
SpO
2
SaO
2
Blood o
xy
gen sa
tur
ation (%)
100
95
90
85
80
75