Mindray WATO EX-55Pro, Service Manual

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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 lines of the
flow sensor:
1. Connect the tubes of the anaesthesia machine with constant flow. For details, see section
5.4.1.
2. Ensure that the gas source supplies gas normally.On the
Diagnostic Tests
interface, set
the PEEP safety valve to the ON state and the D/A value of the PEEP valve to be larger
than 1500 so that the pressure of the PEEP valve is higher than 30 cmH2O.
3. Increase the D/A value of the inspiratory valve gradually. The sampling A/D value
measured by the flow sensor increases accordingly. As the gas supply pressure increases
gradually:

If the sampling A/D value measured by a flow sensor decreases gradually, the two
sampling lines of the flow sensor may be connected reversely.

If the sampling A/D value measured by a flow sensor remains unchanged, the two
sampling lines of the flow sensor may be fractured or not connected.
 If the sampling A/D value measured by a flow sensor reaches the saturation value
(over 6000) quickly, the sampling line of the low pressure end (exhaust end) may
not be connected.
4. For any sampling line connection errors, reconnect all sampling lines and ensure that
they are connected correctly.
 Perform the following operations to diagnose the measurement error of the flow sensor:
After confirming that the zero point of the sensor is correct and that the sampling lines
are connected correctly, check the accuracy of the flow sensor:

As the actual flow volume increases, the measurement value of the flow sensor
increases accordingly.Otherwise, the calibration data is incorrect. In this case, you
need to recalibrate the flow sensor.

The measurement value of the flow sensor is accurate compared with that of
standard flow measurement equipment (calibration equipment of the anaesthesia
machine). Otherwise, the calibration data is incorrect. In this case, you need to
recalibrate the flow sensor.
For details about how to check the accuracy of the flow sensor, see section 6.6.5 Check the Flow
Sensor Accuracy.