87
System Checks
31. Increase the pressure to 30 cmH
2
O.
32. After 12 breaths, verify that the pressure measuring device reads 30 ±3
cmH
2
O.
33. Continuously squeeze test lung at the expiratory phase to simulate a high
pressure alarm. Ensure that the high pressure alarm is displayed on the
ventilator.
34. Remove all test equipment from the breathing circuit. Run the ventilator in
volume control mode with the following settings:
• Volume = 500 ml
• BPM = 8
• I:E = 1:2
• PEEP = OFF
35. Disconnect the O
2
supply and air supply (if fi tted). Verify that the following
alarms are displayed on the ventilator.
• Apnea
• Sustained Pressure
• Low Gas Pressure
• Pressure Low
• O
2
Supply Fail
36. Reconnect the O
2
and Air (if fi tted) supplies and let the ventilator stabilize.
37. Lower the pressure limit to 20 cmH
2
O. Secure the test lung so that it
cannot infl ate until the pressure limit alarm is displayed on the ventialtor
screen. After it is displayed, increase the pressure limit to 50 cmH
2
O.
38. Verify that the minute volume (MV) is displayed on the ventilator. Increase
the minute volume (MV) lower limit to 8, then verify that the Minute
Volume Low alarm is displayed on the ventilator.
39. Decrease the minute volume (MV) lower limit to 2 and the higher limit to
3. Verify that the Minute Volume High alarm is displayed.
40. Disconnect the O
2
sensor from the absorber and expose it to room
temperature. Wait for the O
2
to read 21%. Increase the oxygen lower
alarm limit to 25, then ensure that the Oxygen Low alarm is displayed on
the ventilator.
Ensure that the O
2
sensor used is calibrated.
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