Mindray A9 - Inaccurate Airway Pressure Control

7-48
Failure
Description
Cause Confirmation
Confirmation
Result
Solution
constant-flow test
for further analysis
by referring to
5.16.
replace the sensor (refer to
11.5.2).
Check the zero point of the
sensor by referring to 5.15.
Refer to 5.15.
Zero the sensor by referring
to 6.3.7.
If there is a significant
difference (greater than ±10
mL/min or 5% of the
setting) between TVe and
TVi displayed on the UI,
perform the constant-flow
test by referring to 5.16, or
perform flow sensor
diagnosis by referring to
7.6.1.2.
The difference
between TVe/TVi
displayed on the
UI and the flow
setting of the
machine exceeds
5% or 0.5 L/min,
or
the flow difference
found in flow
sensor diagnosis in
7.6.1.2
exceeds
5%.
1. Calibrate the flow sensor
by referring to 6.3.1.
(2) If the problem persists,
replace the sensor (refer to
11.5.2).
(3) If the problem persists,
replace the sensor adapter
board (refer to 11.1.16).
Check whether pressure
measurement of the pressure
sensor is accurate by
referring to
5.17 (device
required) or 7.6.1.3
(no
device required).
Make a judgment
by referring to 5.17
or 7.6.1.3.
(1) Perform pressure
calibration by referring to
6.3.5.
(2) If the problem persists,
replace the sensor adapter
board (refer to 11.1.16).
Open the service door (refer
to 8.1.1) and check whether
the sensor adapter board and
3-way valve sampling line
are connected properly.
The silicone tube
loosens or is
occluded.
Reconnect the silicone tube
and prevent it from
occlusion.
Remove the VE assembly
by referring to 8.29 and
check whether the sampling
line on the work surface is
connected properly.
The silicone tube
loosens or is
occluded.
Reconnect the silicone tube
and prevent it from
occlusion.
Check whether other
technical alarms are
generated.
A ventilation
technical alarm is
generated.
Refer to 7.3 to clear the
alarm.
The problem persists.
The problem
persists.
Replace the drive gas
assembly (refer to 11.1.17).
7.4.5 Inaccurate Airway Pressure Control
Failure
Description
Cause Confirmation
Confirmation
Result
Solution
Inaccurate
airway pressure
control in
pressure mode
Check whether the gas
supply is sufficient.
The gas supply
pressure is less
than 280 kPa (40
psi).
Connect or replace the gas
supply.
Check for leakage in the
breathing system.
The leakage is
greater than 200
Refer to 7.2.3.