Mindray WATO EX-55Pro, Service Manual

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8.5.3 Preparations Before Using the Valve Diagnosis Tool
Before identifying valve or sensor faults by using the valve diagnosis tool, make preparations as
follows:
1 Connect the airway according to the type sensor or valve to be checked.
Before using the diagnosis test menu, connect the tubes of the anaesthesia machine with
constant flow to check the flow sensor and inspiratory valve. For details, see section
7.3.2 Flow calibration (Service).
2. Ensure that the gas supply pressure complies with the regulations.
3. When the system is in standby mode, choose
Main
>
Service
>
Diagnostic Tests
to
access the diagnostic test menu.
8.5.4 Diagnosing Zero Point Exceptions of Sensors
You can easily determine whether the zero points of all pressure sensors and flow sensors comply
with the regulations.
To diagnose the zero points of the sensors, perform the following operations:
1. Disconnect all gas sources and ensure that the actual values of the sensors are 0.
2. Query the A/D sampling value of each sensor in the menu of the valve diagnosis tool.
This value is the zero point of the sensor.
3. If the zero point of any sensor exceeds the specified range, the VCM is faulty. You need
to replace the VCM.
You can also check the zero points of sensors according to section
6.6.4 Check the Sensor Zero
Point
.
Note

For details about the normal range of zero points of sensors, see section 3.7.3.
8.5.5 Diagnosing Flow Data Exceptions of Sensors
The flow sensor has two sampling tubes. Connection exceptions include:
 The two sampling lines are connected reversely.
 One sampling line is not connected.
 Neither sampling line is connected.