Mindray WATO EX-55Pro, Service Manual

Page: 343 / 474

8-89
11. Adjust the O2 flow regulator until the O2 flow reaches about 0.5 L/min and the reading
on the test pressure gauge decreases to 0.2 MPa (2 bar).
12. Turn off the O2 flow so that the reading on the test pressure gauge does not decrease. If
the alarm Drive Gas Pressure Low is generated after 10 seconds, the pressure switch in
the integrated airway of the expiratory valve is damaged. Handle this problem according
to the relevant fault identification table.
13. Adjust the O2 flow regulator until the O2 flow reaches about 0.3 L/min and the reading
on the test pressure gauge decreases to 0.15 MPa (1.5 bar).
14. Turn off the O2 flow so that the reading on the test pressure gauge does not decrease. If
the alarm O2 Supply Failure is not generated after 10 seconds, the pressure switch of the
O2 supply inlet is damaged. Handle this problem according to the relevant fault
identification table.
15. Adjust the O2 flow regulator until the O2 flow reaches about 0.3 L/min and the reading
on the test pressure gauge decreases to 0.05 MPa (0.5 bar).
16. Turn off the O2 flow so that the reading on the test pressure gauge does not decrease. If
the alarm Drive Gas Pressure Low is not generated after 10 seconds, the pressure switch
in the integrated airway of the expiratory valve is damaged. Handle this problem
according to the relevant fault identification table.
8.6.1.3 Adjusting the Pressure Switch
Adjust the pressure switches for the O2 source and drive gas according to the description below.
Adjust the O2 source pressure switch by using a screwdriver. Turn the switch moderately each
time, for example, for 30 degrees. Note that you can turn the pressure switch clockwise to reduce
the alarm limit or anticlockwise to increase the alarm limit. Test the pressure switch each time
after you adjust the pressure. Repeat this operation until the pressure switch is adjusted correctly,
that is, within the specified range of 220 kPa+/-10 kPa.