7-9
3. Use a screwdriver to adjust the zeroing screw, letting the pressure gauge pointer go to
zero.
4. Set the bag/mechanical ventilation switch to the mechanical position.
5. Plug the Y piece into the leak test plug to close the breathing system.
6. Push the O2 flush button repeatedly to sweep the pointer across the pressure gauge.
7. Remove the plug from the patient connection 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.
9. If the pointer goes to zero, re-install the lens onto the gauge. If not, replace the airway
pressure gauge.
Zeroing point
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