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11.4
Oxygen Bleed Flow Measurement
The nCPAP driver utilizes a side-sampling of the blended gases to monitor the FiO
is referred to as Oxygen Bleed Flow and is channeled and vented outside of the driver via the
Oxygen Sensor Bleed Port in the Bottom Case. The Oxygen Bleed Flow must be within
specification to maintain the stated FiO
any service or repair. Never occlude the Oxygen Sensor Bleed Port as this may damage the
internal oxygen sensor or cause internal leaks.
1.
Connect air and O
pressure of 50 ± 1 psig.
2.
Connect a circuit and CPAP generator to the Patient Circuit Connection and
Proximal Pressure Port.
3.
Power up the driver and allow the unit to perform the Power-On Self Test (this takes
~ 45 seconds).
4.
Confirm that the driver passes the Power-On Self Test by ensuring that the driver
enters Patient Treatment Mode (the main screen) and that "System Active" appears
in the Message Bar.
5.
Measure the Oxygen Bleed Flow exiting the Oxygen Sensor Bleed Port, located on
the underside left-rear of the driver (refer to Figure 3 in section 3).
Do not block or occlude flow from exiting the Oxygen Sensor Bleed Port as
6.
Normal Oxygen Bleed Flow specifications for inlet pressures at 50 ± 1 psig
are 0.9 to 3.0 lpm.
7.
To allow for normal variations in inlet source pressure of 41 – 66 psig (and
potentially, the unavailability of a breathing circuit and generator), the acceptable
Oxygen Bleed Flow specification is 0.7 – 3.0 lpm.
8.
If the Oxygen Bleed Flow falls outside of the stated specification, check the
plumbing inside the driver for loose connections and/or kinks in the tubing.
9.
If the Oxygen Bleed Flow is within the stated specification, then the driver may be
released for normal use.
10. If the Oxygen Bleed Flow is not within the stated specification and cannot be
corrected, then the driver must be taken out of service and repaired (refer to section
15, Troubleshooting).
11.5
Fuse Replacement
There is one (1) Fast Acting 3.0 Amp 250 V fuse on the
rear of the unit. Replace the fuse if blown.
Replace the fuse with a Fast Acting 3.0A 250V fuse.
© © © © 2008, Cardinal Health
supply gases between 41 – 66 psig, preferably at a nominal
2
this may damage the internal oxygen sensor or create internal leaks.
AirLife
accuracy so it must be inspected routinely and after
2
CAUTION
Page 35 of 81
®
nCPAP Driver Service Manual
. This flow
2
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