26
4: Troubleshooting
Table 4. Troubleshooting the Certifier
®
FA Test System (cont.)
Symptom
Possible Cause
Corrective Action
Can’t select
AIR O
2
mixtures.
Oxygen sensor not
connected. Look for
oxygen sensor
symbol,
.
Connect oxygen sensor
cable to High Flow
module and oxygen
sensor.
Volume, minute
volume, peak
flow, peak
pressure, PEEP,
respiratory rate,
or I:E ratio
measurement
isn’t updated.
Less than two
consecutive full
breaths have been
supplied to flow
module, or flow is
not supplied as a
breathing waveform.
Bias flow is greater
than auto trigger
level.
Inhalation cycle is
less than 0.25
milliseconds
Testing pressure
mode on ventilator
and no test lung
attached.
Wait for at least two
consecutive full breaths
to be supplied to the
flow module.
Ensure that flow is
supplied as a breathing
waveform.
Manually set flow
trigger level.
Certifier
®
FA cannot
measure shorter than
0.25 millisecond flow
delivery.
Use a test lung so that
at least 0.25
milliseconds of flow
delivery is generated to
generate pressure.
Can’t change
measurement
units.
Measurement isn’t
displayed while
changing units.
Press the
Top line
select
or the
Bottom
line select
key to
display measurement,
then press the
DISPLAY UNITS
key to
change units.
Can’t zero low-
pressure
transducer.
Transducer is
connected to a
pressure source.
Disconnect pressure
tubing from flow
module, then zero low-
pressure transducer.
Can’t zero
barometric
pressure
transducer.
Barometric pressure
transducer does not
require a zero
calibration.
Resume normal system
operation.
