Mindray WATO EX-55Pro, Service Manual

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4-27
NOTE

In case of leak test failure, check the machine for leakage and roughly assess the
amount of leakage by using the following methods.

Method 1: In the default VCV mode, stop fresh gas supply. If the bellows rises to
the top each time, it indicates that the machine is not leaky. Otherwise, the machine
is leaky. Gradually increase fresh gas. The amount of fresh gas when the bag rises
to the top at each expiration can be roughly calculated as the amount of leakage.
 Method 2: During leak test, observe the airway pressure gauge. A period of time
(about 30 s) belongs to pressure holding stage after the airway pressure rises. If the
airway pressure gauge shows that airway pressure is gradually falling, it indicates
that the machine is leaky. Slowly increase fresh gas until airway pressure stops
falling. The amount of the then fresh gas can be calculated as amount of leakage.

If there is indeed a leak, check the pneumatic circuit system for leakage and
troubleshoot the problems as described in section 8.3 Leak and Compliance Tests.

After leak failure is troubleshot, do the leak test again and make sure the test is
passed.
4.11.5 APL Valve Test
1. Make sure that the system is Standby. If not, press the key and select [
Ok
] from the
pop-up menu to enter Standby.
2. Set the Bag/vent switch to the bag position.
3. Connect the manual bag to the manual bag port.
4. Connect the Y piece on the breathing tube to the leak test plug on the manual bag port.
5. Turn the APL valve control to let the pressure of APL valve stay at 30 cmH
2
O.
6. Push the O2 flush button to inflate the manual bag.
7. Make sure that the reading on the airway pressure gauge is with the range of 25 to 35
cmH
2
O.
8. Turn the APL valve control to the SP position.
9. Set the O
2
flow to 3 L/min. Turn any other gases off.
10. Make sure that the reading on the airway pressure gauge is less than 5 cmH
2
O.
11. Push the O
2
flush button. Make sure that the reading on the airway pressure gauge does
not exceed 10 cmH2O.
12. Turn the O
2
flow control to set the O
2
flow to minimum. Make sure that the reading on
the airway pressure gauge does not decrease below 0 cmH
2
O.
4.11.6 O2 Sensor Related Tests
4.11.6.1 O2 Sensor Disconnection Alarm Test
1. Select , and then [
System
], and enter password: 799789.
2. Set [
O
2
Cell Monitoring
] to [
On
], and select [
Confirm
].
3. Disconnect the plug of O2 sensor, a prompt message of O2 Sensor Disconnected should
appear. Connect O2 fixture (0611-K08-XX), this message should disappear.