
C-5
C.2.4 Masimo SpO
2
Module Alarm Messages
Alarm message A B L Cause Action
SPO2 SENSOR
OFF
No Yes * The sensor is
disconnected from
the patient or the
monitor.
Make sure that the
sensor is placed at an
appropriate position
and the monitor is
connected to cables
correctly.
SPO2 PULSE
SEARCH
No No L The monitor is
searching for the
patient’s pulse
signal.
If the pulse reading is
not displayed after 30
seconds, check if the
sensor is properly
connected to the
patient. Change the
sensor site for better
signals if necessary.
SPO2
INTERFERENCE
No No L The pulse signals
are subject to great
external
interference.
Reduce or remove
external interference.
SPO2 LOW
PERFUSION
No No L The pulse signal is
too weak.
Move the sensor to a
site with better
perfusion.
SPO2 TOO MUCH
LIGHT
No No L Too much light on
the sensor.
Turn down or off the
lighting, move the
sensor to a place of
weaker light or cover
the sensor.
UNKNOWN SPO2
SENSOR
No No L The monitor cannot
recognize the SpO
2
sensor type.
Check whether the
type of the sensor is
correct.
SPO2 BOARD
FAULT
No No H The SpO
2
board
malfunctions and
might not be able to
measure the pulse
signals correctly.
Stop using the SpO
2
module, and contact
biomedical engineers
or us for
maintenance.
SPO2 SENSOR
FAULT
No No H The sensor is
damaged.
Stop using the sensor.
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