Mindray WATO EX-65 - Adjust the APL Valve Accuracy

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4. Set the bag/mechanical ventilation switch to the mechanical ventilation position.
5. Plug the Y piece into the test plug to close the breathing circuit.
6. Push the O2 flush button repeatedly to sweep the pointer across the pressure gauge.
7. Remove the Y piece from the test plug and release the O2 flush button. Check if the
pointer goes to zero.
8. Repeat the steps above if the pointer fails to go to zero. If the pointer still fails to go to
zero, replace the airway pressure gauge.
9. If the pointer goes to zero, re-install the lens onto the gauge. If the pointer still fails to go
to zero, replace the airway pressure gauge.
4.6 Adjust the APL Valve Accuracy
To calibrate the APL valve:
1. Connect the inspiration connector and bag arm port using a breathing tube, as shown
below.