C.2.7 Nellcor SpO2 Module Alarm Messages
Alarm message A B L Cause Measure
SPO2 SENSOR
OFF
No Yes 3 The sensor is
disconnected from the
patient or the monitor.
Make sure the sensor is placed
on the patient’s finger or other
parts, and the monitor is
connected to cables correctly.
SPO2 NO
SENSOR
Yes Yes 3 The sensor is
disconnected from the
patient or the monitor, or
the sensor is not
connected properly.
Disconnect and reconnect the
sensor as directed by the
instructions. If the alarm
remains, the sensor or the cable
might have been damaged.
The SpO2 probe is Disconnect and reconnect the
inserted upside down. sensor as directed by the
instructions. Pay attention to the
mark on the probe.
SPO2
INTERFERENCE
No No 3 The pulse signals are
subject to great external
interference.
Reduce or remove external
interference.
SPO2 BOARD No No 1 The SpO2 set board Stop using the SpO2module,
FAULT malfunctions and might
be unable to measure the
pulse signals correctly.
and contact biomedical
engineers or our company for
maintenance.
SPO2 MOTION No No 3 The patient is moving. Reduce patient motion.
SPO2 SENSOR
FAULT
No No 1 The probe is damaged. Stop using the sensor.
SPO2 WEAK
SIGNAL
No No 3 The SpO2 signal is weak. Change the sensor site for better
signals.
SPO2 WEAK
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