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3.7.3 Breathing System Leak Test in Manual Ventilation Mode
NOTE
z Perform leak test again each time after servicing the anesthesia machine, replacing
the components, or re-connecting the tubes.
The test aims to check if the pneumatic circuit has leaks in manual ventilation mode. Test
items include APL valve, check valve, sodalime canister, patient tubes, flow sensors and their
connectors.
To do the breathing system leak test in manual ventilation mode:
1. Make sure that the system is Standby. If not, press the
key and select [Ok] from the
pop-up menu to enter Standby.
2. Set the bag/mechanical ventilation switch to the bag position.
3. Connect the manual bag to the manual bag port.
4. Turn the APL valve control to fully close the APL valve (75 cmH
2
O).
5. Turn the O
2
flow control to set the O
2
flow to 0.15 to 0.2 L/min.
6. Close the breathing system at the patient connection.
7. Push the O
2
flush button to let the pressure increase to approximately 30 cmH
2
O on the
airway pressure gauge.
8. Release the O2 flush button. A pressure decrease on the airway pressure gauge indicates
a leak. Look for and repair the breathing system leak.
NOTE
z If there is indeed a leak, check the pneumatic circuit system for leakage and
troubleshoot the problems as described in 5.3Pneumatic Circuit System Problems.
z After leak failure is troubleshot, do the leak test again and make sure the test is
passed.
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