A5/A3™ Operating Instructions 046-003777-00 7 - 9
Maintenance Water Build-up in the Flow Sensor
7.7 Water Build-up in the Flow Sensor
7.7.1 Prevent Water Build-up
Water comes from the condensation of exhaled gas and a chemical reaction between CO
2
and the
soda lime in the CO
2
absorbent canister. At lower fresh gas flows more water builds up because of
the following:
• Less gas in the breathing system is removed through AGSS and gets replaced with fresh gas.
•More CO
2
stays in the CO
2
absorbent canister to react and produce water.
• More moist, exhaled gas stays in the breathing system and CO
2
absorbent canister to
produce condensed water.
Check the inspiratory and expiratory flow sensors when abnormal flow waveform or unstable tidal
volume fluctuation is detected. Check the sensor for water. If there is water build-up, clear it
immediately before use.
To prevent water build-up:
• Use a filter between the flow sensor and the patient to limit water condensation in the flow
sensor.
• Check the water trap for water before using the A5/A3 Anesthesia System. If there is water
build-up, clear it immediately.
7.7.2 Clear Water Build-up
The water build-up inside the flow sensor will result in inaccurate measured value of tidal volume. If
there is water built up inside the flow sensor, remove the sensor and clear the water. Then reinstall the
sensor for use.
WARNING: Check water build-up inside the flow sensor before every system use.
Accumulated water in the flow sensor causes erroneous readings.
WARNING: Ensure that all breathing system parts are completely dried after the
breathing system is cleaned and disinfected.
7.8 Waste Gas Transfer Tube Maintenance
Check the waste gas transfer tube of the AGSS or DGSS. Replace it if it is damaged.
7.9 Electrical Safety Inspection
NOTE: Perform electrical safety inspection after servicing or routine
maintenance. Before the electrical safety inspection, make sure all the
covers, panels, and screws are correctly installed.
NOTE: The electrical safety inspection should be performed once a year.
7.9.1 Auxiliary Electrical Outlet Test
Verify the mains voltage is present at each auxiliary outlet when the A5/A3 is connected with power.
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