Problem
Potential Cause
Corrective Action
Cannot achieve
Leak in the
1. Check and secure all
80-82cmH2O peak
breathing
connections and ensure
inspiratory
circuit.
the patient connector
pressure.
is attached to the
mechanical test lung
OR
OR
for a closed system.
Minimum
cycling
pressure less
than 8cmH2O.
Outflow-valve
2. Ensure diaphragm is
diaphragm not
positioned correctly and
seating
is not ruptured. Replace
properly or
the diaphragm, if needed,
diaphragm
with P/N 5630.
ruptured.
OR
Leak in the
3. Apply a liquid leak
inspiratory
detector to both ends of
relief pressure
tubing connections color
tubing system.
coded blue. Tighten or
OR
correct any connection
which bubbles.
Gas escaping
4. Use 1/2 inch open-end
around O-ring
wrench to remove valve.
on inspiratory
Check condition of small
relief pressure
O-ring on end of valve.
valve.
Replace if worn, flat, or
OR
cut.
Faulty
5. Replace with new valve.
inspiratory
relief pressure
valve
(P/N 344B).
Inspiratory
6. Adjust inspiratory
time set for
time as discussed earlier
less than 1
in step (4) above.
second.
Minimum
Faulty
7. Replace with a new
cycling
inspiratory
valve (P/N 344B).
pressure is
relief pressure
greater than
valve.
14cmH2O.
Table 2-10. Inspiratory relief pressure troubleshooting.
MD0355
2-21