8-72
Failure
Description
Possible Cause Recommended Action
The inlet flow sensor on the
integrated airway of the
expiratory valve is damaged.
Replace the expiratory valve or its integrated
airway.
Expiration begins in advance
because the specified Plimit
value is too small.
Set the Plimit to a larger value so that the
Paw value does not exceed the limit.
The displayed TVe and TVi
values are different.
In the valve test tool, compare the
measurement errors of the three sensors and
determine whether to calibrate the sensors
according to section 7.3.2 Flow calibration
(Service).
In the preceding table, the items marked with an asterisk (*) are possible causes of inaccurate
measurement values of the flow sensor. Perform the following steps to check whether the fault of
inaccurate breathing capacity is induced by the causes marked with an asterisk (*):
1. Turn off the flow regulator.
2. Ensure that the patient is disconnected from the system and the auto/manual ventilation
switch is turned to the mechanical ventilation position.
3. Remove the bellows and then install the bellow housing correctly.
4. Remove the water collection cup.
5. Connect the inspiratory connector and the expiratory connector by using a corrugated
tube. See the figure below.
The water collection cup
h
n r
m
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