A7™ Service Manual 046-006272-00 5 - 55
Repair and Troubleshooting Pneumatic Circuit System Problems
5.3.4.1 Leak Test of Flow Sensor Pressure Sampling Pipeline
If the flow waveform is displayed irregularly, the flow sensor pressure sampling pipeline may be leaky.
Perform the leak test by using the following tools:
• Anesthesia machine calibration device (quantity:1)
• Flow sensor pressure sampling pipeline test fixture (quantity:1)
• Circuit adapter test fixture (quantity:1)
• Injector (quantity:1)
• Ø6 silicone tube (quantity:3)
• Y piece (quantity:1)
Test procedures:
A. Leak test of the flow sensor pressure sampling pipeline (the four sampling pipelines of the
expiratory and inspiratory flow sensors are all tested)
1. Turn off the system switch.
2. Install the breathing system properly.
3. Remove the flow sensor assembly.
4. Mount the flow sensor pressure sampling pipeline test fixture onto the position where the
flow sensor assembly was originally mounted. Tighten the breathing connector rotary cap.
5. Connect the Ø6 silicone tubes to the pressure sensor connector (positive pressure end) on
the anesthesia machine calibration device), injector (before mounting, pull out the push rod
of the injector) connector and the connector for the flow sensor pressure sampling pipeline
test fixture by using a Y piece, as shown below.
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