5-62
NOTE
z For the normal range of sensors’ zero points, refer to 4.2.4Check the Sensor Zero
Point.
5.4.3.2 Problems Related to Sampling Line Connections of the Sensors
The flow sensor has two sampling lines. Connection errors include:
The two sampling lines are connected reversely.
One sampling line is not connected.
Two sampling lines are not connected.
The pressure sensor has one sampling line. Connection errors include:
The sampling line is not connected.
The sampling line is connected incorrectly.
By using the valves-test tool, you can detect if the sampling lines are connected normally.
To diagnose the sampling line connection of the flow sensor:
1. Connect the tubes of the anesthesia machine following the constant-flow connection
method. Refer to 5.4.1Preparations before Using the Valves-test Tool.
2. Make sure that gas supplies are normal. In the [Valves-Test Tool] menu, set the PEEP
safety valve to ON and the D/A value of the PEEP valve to more than “1500”, making
sure that the PEEP valve closes at 30 cmH2O above.
3. Increase the D/A value of the inspiratory valve gradually and the A/D value of the
flow sensor should also increase. With the gradual increase of gas supplied,
If the A/D value of one sensor decreases gradually, it is possible that the two
sampling lines of the sensor are connected reversely.
If the A/D value of one sensor keeps unchanged, it is possible that the two
sampling lines of the sensor are broken or not connected.
If the A/D value of one sensor nears saturation (above “4000”) quickly, it is
possible that the sampling line at the low pressure end (gas outlet end) of the
sensor is not connected.
4. If sampling line connection errors are detected, re-connect the sampling lines and
check their connection correctness.
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