Mindray WATO EX-55Pro, Service Manual

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8.5.6 Diagnosing Pressure Data Exceptions of Sensors
 The pressure sensor has one sampling line. Connection exceptions include:
 The sampling line is not connected.
 The sampling line is connected incorrectly.
You can check whether the sampling lines are connected correctly by using the valve diagnosis
tool.
 Perform the following operations to check the connection of the sampling line of the
pressure sensor:
 During normal ventilation, sampling line connection errors will be easily noticed
through the Paw waveform and technical alarms. If the waveform value decreases
as the actual pressure increases and the alarm Paw Too Low or Patient Circuit Leak
is generated, the sampling line of the airway pressure sensor may be connected
incorrectly.
 Access the
Diagnostic Tests
menu and set the PEEP safety valve to the ON state.
Increase the D/A value of the PEEP valve gradually and observe whether the
sampling A/D value measured by the PEEP pressure sensor increases accordingly.
If no, it further proves that the PEEP pressure sensor may be connected incorrectly.
 To diagnose whether the sampling line of the pressure sensor is connected normally in
case of pressure calibration failure, perform the following steps:
1. Connect the tubes of the anaesthesia machine according to section 5.3Valves Diagnostic
Test Tools.
2. Ensure that the water collection cup is reinstalled.
3. Ensure that the gas source complies with the regulations. Access the
Diagnostic Tests
menu and set the PEEP safety valve to the ON state. Set the flow volume of the
inspiratory valve to 5 L/min.
4. Increase the D/A value of the PEEP valve gradually. The sampling A/D value measured
by the pressure sensor increases accordingly.

If the sampling A/D value measured by a pressure sensor decreases gradually, the
sampling line of the pressure sensor may be connected incorrectly.
 If the sampling A/D value measured by a pressure sensor remains unchanged, the
sampling line of the pressure sensor may not be connected.
 The pressure value on the airway pressure gauge increases. Otherwise, the airway
pressure gauge is damaged.