There is a delay between a physiological event at the measurement site and the corresponding alarm
indication at the monitor. This delay has two components:
The general measurement delay time is the time between the occurrence of the
physiological event and when this event is represented by the displayed numerical values.
This delay depends on the algorithmic processing and, for certain measurements (SpO
BIS), on the configured averaging time. The longer the averaging time configured, the longer the
time needed until the numerical values reflect the physiological event.
The time between the displayed numerical values crossing an alarm limit and the alarm
indication on the monitor. This delay is the sum of the alarm delay configured for the specific
measurement plus the system alarm delay. The system alarm delay is the processing time the
system needs for any alarm on the monitor to be indicated after the measurement has triggered the
alarm. See the performance specifications in the Specifications chapter for the system alarm delay
The alarm delay configured for a specific measurement is normally a fixed time. For SpO
possible to configure a Smart Alarm Delay that is calculated using an intelligent algorithm. See "Smart
Alarm Delay" on page 177 in the SpO
If more than one alarm is active, the alarm messages are shown in the alarm status area in succession.
An arrow symbol next to the alarm message informs you that more than one message is active.
The monitor sounds an audible indicator for the highest priority alarm. If more than one alarm
condition is active in the same measurement, the monitor announces the most severe. Your monitor
may be configured to increase alarm indicator volume automatically during the time when the alarm is
Visual Alarm Indicators
An alarm message text appears in the alarm status area at the top of the screen indicating the source of
the alarm. There is a field for INOPs (light blue, red or yellow) and a field for patient alarms, which is
shared for red and yellow alarms. If more than one measurement is in an alarm condition, the message
changes every two seconds, and has an arrow at the side. If both red and yellow alarm conditions are
active simultaneously, they alternate every two seconds in the patient alarms field. The background
color of the alarm message matches the alarm priority: red for red alarms, yellow for yellow alarms,
light blue for standard INOPs, red for red INOPs and yellow for yellow INOPs. The asterisk symbols
(*) beside the alarm message match the alarm priority: *** for red alarms, ** for yellow alarms, * for
short yellow alarms. Standard INOPs do not have a symbol, red and yellow INOPs have exclamation
marks beside the alarm message: !!! for red INOPs and !! for yellow INOPs.
Depending on how your monitor is configured, it may display alarm limit violation messages:
in text form, for example
in numeric form, for example
deviation from the alarm limit, and the second number shows the currently set limit.
The numeric of the measurement in alarm flashes.
chapter for more details.
** SpO₂ Low
where the first number shows the maximum
, EEG and
it is also