12-13
12.10 Water Build-up in the Flow Sensor
12.10.1 Prevent Water Build-up
The patient’s exhaled warm and moist gas is condensed when it flows through the expiratory
hose. The condensed water remains on the hose wall and finally enters the water trap. When
the patient’s exhaled gas arrives at the expiration valve, condensed water may appear at the
expiration valve (including the expiratory flow sensor), compromising the measurement
accuracy of expiratory flow sensor.
Check the expiration valve for water build-up when abnormal flow waveform or unstable
tidal volume fluctuation is detected. If there is water build-up inside the expiration valve,
clear it before use.
Check the expiratory water trap for water during the use of the ventilator. If there is water
build-up, empty it promptly. Water condensation in the expiration valve can be reduced by
using a bacteria filter between the expiratory tube and expiration valve.
12.10.2 Clear Water Build-up
If there is water built up inside the expiration valve, remove the expiration valve and clear the
water. Then reinstall the valve for use.
WARNING
Ensure that all breathing system parts are dry every time when the breathing
system is cleaned and disinfected.
Check the expiration valve for water build-up when abnormal flow waveform or
unstable tidal volume fluctuation is detected. If there is water build-up inside the
expiration valve, clear it.
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