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4.2.8 Oxygen Concentration Alarms
The oxygen concentration is allowed to operate within a ±3 %O2 range without alarming.
A Medium Priority alarm will activate whenever the product of the variance outside of the
FiO2 range and the duration (in seconds) of the variance exceeds 20.
A High Priority alarm will activate whenever the product of the variance outside of the FiO2
range and the duration (in seconds) of the variance exceeds 30.
For example: if the Set %O2 is 30% and the reading is 35% for a period of ten (10)
seconds, a Medium Priority alarm will activate. In this case the reading is 2 percentage
points outside of the ±3 percentage point range. If the Set %O2 is 30% and the reading is
35% for a period of 15 seconds, a High Priority alarm will activate.
4.2.9 Battery Alarms
An audible and visual Low Battery alarm has dual limits. The first limit will activate the
Medium Priority alarm when the battery falls below 10% remaining (approx. 24 minutes of
battery power remaining). The second limit will activate the High Priority alarm when the
battery falls below 5% remaining (approx. 12 minutes of battery power remaining). There is
a 2-second delay for this alarm. An audible and visual Battery Charge Fail alarm will
indicate if the battery is not charging properly. The system verifies proper charging at start
up and routinely during operation. There is a 5-second delay for this alarm.
4.2.10
Oxygen Calibration Alarm
An audible and visual High Priority Oxygen Calibration alarm will indicate if an error occurs
during the Oxygen Sensor calibration. A Warning Screen will appear indicating that an
error occurred during the Oxygen Sensor Calibration and informing the user to either
remove the patient from the device and cycle power or remove the device from service.
While the alarm is active, the driver provides CPAP and FiO2; however, the FiO2 may not
be accurate. The system calibrates the Oxygen Sensor during the Power-On Self Test and
routinely during operation. There is no delay for this alarm.
4.2.11
Software Fault
An audible and visual High Priority Software Fault alarm will indicate if a software fault is
detected. The system will display a fault code, which should be recorded. If the fault is
non-fatal, the alarm can be cleared and the system will return to normal operation. If the
fault is fatal, the driver will need to be removed from service as soon as possible. There is
no delay for this alarm.
4.2.12
Flow/Pressure Sensor
An audible and visual Sensor Calibration alarm will indicate if either the flow or pressure
sensor has failed the calibration during the Power-On Self Test. A Warning Screen will
appear indicating which sensor has failed to calibrate and informing the user to remove the
device from service.
© © © © 2008, Cardinal Health
AirLife
Page 13 of 81
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nCPAP Driver Service Manual
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