www.bedfont.com
20
NOxBOX
®
mobile Operating Manual
English
Troubleshooting
The NOxBOXmobile is a device for use in
critical care applications. As such, any actions
carried out on the device must take into
consideration the condition and treatment of the
patient as the overall defining factor.
In all cases, in the event of a peripheral monitor
alarm sounding, first check the health and
condition of the patient and take necessary
actions to best serve the patient’s needs.
Details on remedial actions to take in the event
of the monitor alarm should be covered by the
monitor user manual.
Q: The INO monitor attached to the patient
circuit is indicating high NO
2
levels and a low
NO dose
A: Oxidation may have occurred in the NO high-
pressure supply line.
If qualified and you assess it to be safe to do so,
the fastest purge method is to crack pressure
at the high pressure line by following the steps
below:
●
Turn-off the cylinder control valve fully.
●
Using spanner provided, carefully turn
the connection nut until a sharp hissing
indicates the gas is being relieved in the
pressure line. This should stop within a few
seconds.
●
Fully tighten the connection nut with the
spanner
●
Open the cylinder control valve
Repeat for second supply lines.
During the above procedure, the regulated gas
in the system will continue to feed to the patient.
If deemed safe and appropriate for the patient,
reduce the flow of NO to minimise the level of
gas being delivered to the patient.
WARNING: sudden withdrawal from NO
therapy can have severe effects on the patient,
including, but not limited to, hypoxic rebound.
Ensure that best practice is observed at
all times to ensure the patient is not put at
unnecessary risk.
If the above procedure cannot be followed for
a quick system purge, then the system must be
purged through the flow meters. This must be
done without connection to the patient circuit
to prevent delivering high NO
2
for prolonged
periods of time.
●
Remove outlet from patient circuit (note
warning on sudden NO cessation)
●
Turn off the cylinder control valve on both
cylinders
●
Open the flow meter to approximately 600
cc/min (do not open valve above maximum
delivery scale, risk of damage to the control
mechanism)
●
Allow first system line to purge for 12
minutes
●
Turn the auto-changeover control knob to
the second system line and allow to purge
for 12 minutes.
●
Close the flow meter (do not over-tighten,
this may cause damage to the control
mechanism)
Open both cylinder valves to re-pressurise the
system. The system is ready to reconnect to
the patient circuit safely. Open flow meter to
appropriate setting to recommence delivery of
NO.
Q: Is the outlet pressure adjustable?
A: No, the outlet pressure is factory set and
is not user adjustable. This pressure has
been carefully designed to provide optimal
performance for the system. The flow control
equipment has been calibrated to operate at
this pressure. If any adjustment were made to
this pressure setting, the flow accuracy of the
NO flow meters cannot be guaranteed. This will
affect system performance and invalidate any
existing equipment warranty.
