Air
Life
®
nCPAP Driver Service Manual
2008, Cardinal Health
Page 64 of 81
15. With the power supply connected, verify that the battery charging lightning bolt icon is illuminated,
the green battery LED is lit, the “plug” icon is displayed, and the word “Charge” is displayed. Circle
PASS or FAIL
16. Unplug the external power and verify that a single audible alarm (beep) occurs and the lightning bolt
in the battery icon is replaced with bars indicating the percent charge remaining. Circle PASS or
FAIL
17. Reconnect external power to unit.
Bleed Flow Measurement:
A minimum bleed flow is essential for accurate and responsive FiO
2
blending
18. Connect tubing to the bleed flow outlet port located on the bottom housing of the Driver (See figure
in section 3). Do not occlude the bleed flow port as this may damage the oxygen sensor within the
Driver.
19. Normal Bleed flow specifications for inlet pressures at 50 ± 1 psi is 0.9 to 2.7 LPM with a circuit and
generator connected.
To allow for normal variations in inlet source pressure of 41- 66 PSI (and potentially the
unavailability of a breathing circuit and generator), the acceptable bleed flow specification is
0.7 – 3.0 LPM.
If the bleed flow falls outside of the range stated, then check the plumbing inside the Driver for
loose connections and/or kinks in the tubing and re-test the bleed flow.
20. If the bleed flow falls within specification, circle “PASS”. If the bleed flow is not within the stated
specification, then circle “FAIL” and remove the Driver from service.
21. Turn the main power switch off and confirm that the bleed flow drops to zero
FiO
2
Blender Performance:
This test is performed to ensure accuracy of the delivered FiO
2
.
Note: The Driver utilizes a long-life, ultrasonic O
2
sensor that is automatically calibrated at start-
up, at 20 minutes, 40 minutes (to compensate for warm-up), and every 12 hours thereafter.
22. Set the FiO
2
to 21% and allow the system to equilibrate for 60 seconds (to allow for the normal 20
second grace period and the response time of the external O
2
sensor).
23. Record the %0
2
reading on the Driver’s LCD screen. The value must be /- 3% of the FiO
2
set point.
24. Record the % O
2
as read by an independent Oxygen Analyzer.
25. Repeat for FiO
2
settings of 30%, 50%, 70% and 100%.
26. The value must be within the Driver’s stated accuracy (+/- 3 percentage points) PLUS the accuracy
of the analyzer being used to collect the data (the accuracies are cumulative and must be
included/added to properly disposition the results).
27. Record PASS if all values are within the stated accuracy or FAIL if the results fall outside the stated
accuracy. If the FiO
2
readings fall outside of the stated range, check the following:
