Problem
Potential Cause
Corrective Action
Leak in the
1. Secure all
Cannot achieve
breathing
connections.
at least -
10cmH2O on
circuit.
manometer with
OR
expiratory
flow valve
full CCW.
Gas escaping
2. Use 1/2 inch open-end
around O-ring
(P/N 114) in
Check condition of small
expiratory
O-ring on end of valve.
valve.
Replace if cut, flat, or
OR
worn.
Leak in
3. Adjust flow for 15 lpm
expiratory-flow
and apply liquid to both
tubing.
ends of tubes color coded
"yellow." Correct any
OR
connections that bubble.
Faulty
4. Use 1/2 inch open-end
expiratory flow
gradient valve.
Replace with new valve
OR
(P/N 1198).
Malfunction in
5. Remove cartridge from
inspiratory-
system so you can take it
cartridge (P/N
apart. Remove the back
4286).
of cartridge and check
the condition of
diaphragm, O-rings, and
spring. Replace any worn
parts.
OR
│
│
│ 6. Replace inspiratory-
│
│
│
│ interrupter cartridge (P/N│
│
│
│ 4286).
│
├────────────────┼──────────────────┼───────────────────────────┤
│ Cannot stop
│ Gas escaping
│ 7. See action #2 above.
│
│ expiratory flow│ around O-ring on │
│
│ with valve
│ expiratory valve.│
│
│ closed (full
│
│
│
│ clockwise).
│
OR
│
│
│
├──────────────────┼───────────────────────────┤
│
│ Faulty expiratory│ 8. See action #4 above.
│
│
│ flow valve.
│
│
└────────────────┴──────────────────┴───────────────────────────┘
Table 2-6. Expiratory flow gradient troubleshooting (concluded).
MD0355
2-16