Sensors and Valves Problems Repair and Troubleshooting
5 - 74 046-006272-00 A7™ Service Manual
By using the Diagnostic Tests tool, you can detect if the sampling lines are connected correctly.
To diagnose the sampling line connection of the pressure sensor: ...............................................................................
• During normal ventilation, if a sampling line connection error occurs, it is easily detected through
the Paw waveform and technical alarms. If with the increase of actual pressure, pressure
waveform data decreases and the alarm of “Paw Too Low” or “Patient Circuit Leak” occurs
simultaneously, it is possible that the sampling line of the airway pressure sensor is connected
incorrectly.
• You can enter the [Diagnostic Tests] menu to set the PEEP safety valve to ON. Gradually increase
the D/A value of the PEEP valve and observe if the A/D value of the PEEP pressure sensor also
increases gradually. If not, it further indicates that the PEEP pressure sensor may be connected
incorrectly.
To diagnose the sampling line connection of the pressure sensor in case of pressure calibration
failure:
1. Connect the tubes of the anesthesia machine just like described in ‘‘Preparations before Using
Diagnostic Tests’’ on page 5-72.
2. Make sure to mount the water collection cup again
3. Make sure that gas supplies are within specifications. In the [Diagnostic Tests] menu, set the
PEEP safety valve to ON. Set the Insp. Valve at 5 L/min.
4. Increase the D/A value of the PEEP valve gradually and the A/D value of the pressure sensor
should also increase due to the gradual increase of actual pressure,
• If the A/D value of one sensor decreases gradually, it is possible that the sampling line of the
sensor is connected incorrectly.
• If the A/D value of one sensor remains unchanged, it is possible that the sampling line of the
sensor is not connected.
• The pressure of the airway pressure gauge should increase. If not, it is possible that the
airway pressure gauge is defective.
5. If sampling line connection errors are detected, re-connect the sampling lines and verify proper
connection of all lines.
To diagnose the measurement error of the flow sensors:
1. With the gradual increase of actual pressure, the measured value of the pressure sensor should
also increase. Otherwise, the calibration data have errors. You need to calibrate the pressure
sensor again.
2. Compared with the measured value of the standard pressure measurement device (anesthesia
machine calibration device), the measured value of the pressure sensor should be accurate.
Otherwise, the calibration data have errors. You need to calibrate the pressure sensor again.
For details, refer to “Check the Flow Sensor Accuracy” on page 3-25.
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