8-71
(7) Repeat step 3 to step 7 in 4 Leakage Test on Each Tributary of the Circuit Transit
Adapter. If the test is not passed, the ACGO assembly is damaged, replace the seal ring
of the ACGO assembly or replace the ACGO assembly.
8.4.5 Tidal Volume
The following table lists the faults that may cause inaccurate tidal volumes.
Failure
Description
Possible Cause Recommended Action
Inaccurate tidal
volumes
The flow sensor is installed
incorrectly.
Reinstall the flow sensor.
The fresh gas flow is set
incorrectly.
Reset the fresh gas flow.
There is a leak in the breathing
system and the fresh gas flow is
too light.
Perform check according to the steps
described in sections 2.2.3 and 2.2.4 and
repair the leak points.
*There is water build-up in the
flow sensor.
Remove the flow sensor and eliminate the
water build-up.
*The film of the flow sensor is
deformed or contaminated, or
the internal resistance of the
flow sensor is changed. Zero
drift occurs on the pressure
sensor on the control board of
the ventilator.
Enter the service mode and calibrate the flow
sensor according to section 7.3.2 Flow
calibration (Service).
*There is a leak on the pressure
sampling line of the flow sensor.
Perform check according to the steps
described in the leak test for the pressure
sampling line of the flow sensor and repair
the leak points.
*The flow sensor is damaged. Replace the flow sensor.
*The pressure sensor on the
control board of the ventilator is
damaged.
Replace the control board of the ventilator.
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