Check Valves - Datex-Ohmeda S/5 Avance Technical Reference Manual

7.2.1 Check Valves

1009-0357-000 11/03
Make sure that the check valves on the breathing circuit module work
correctly: The Inspiratory check valve rises during inspiration and falls at the
start of expiration. The Expiratory check valve rises during expiration and falls
at the start of inspiration. A leak across one of the check valves may be great
enough to cause a "reverse flow" alarm.
Inspiratory check valve
1. Set the system switch to On.
2. Set fresh gas flow to minimum.
3. If equipped with an ACGO, connect a tube between the ACGO outlet and
the Inspiratory port.
• Set the ACGO switch to the ACGO position.
• Verify that the Airway Pressure reading increases to 10 cm H
30 seconds.
4. If not equipped with an ACGO, select End Case and connect a tube to the
Inspiratory port.
• Stretch the tube approximately 5 cm.
• Occlude the open end of the tube.
• Release the tension on the tube.
• Ensure that the Airway Pressure reading increases to between 20 and 40
cm H O. If not, repeat the above steps, but stretch the tube a little
2
further.
• Verify that the Airway Pressure reading does not drop by more than 10
cm H O in 30 seconds.
2
Expiratory check valve
1. Set all gas flows to minimum.
2. Set the Bag/Vent switch to Bag.
3. Fully close the APL valve (70 cm H
4. Connect a tube between the Inspiratory port and the Bag port.
5. Slowly increase the O
2
• The leak rate is equal to the flow needed to maintain 30 cm H
• The leak rate should be less than 500 mL/min.
O).
2
flow to achieve 30 cm H O.
2
7 Troubleshooting
O in
2
O.
2
7-5