Mindray WATO EX-55Pro, Service Manual

Page: 111 / 474

4-11
4.8.2 With O2 Sensor
Do as described in
4.12.2Test the O2 Concentration Monitoring and Alarms
before testing.To do
the flow control system tests:
1. Connect the pipeline supplies or slowly open the cylinder valves.
2. Turn all flow controls fully clockwise (minimum flow).
3. Set the system switch to the position.
4. Connect the AC power source if battery capacity shortage occurs. Do not use the system
if other ventilator failure alarm occurs.
5. Set the flow controls to mid range. Check that the flowtube float moves smoothly and
that the electronic flowmeter displays normally.
WARNING

During steps 6 through 7, the O2 sensor used must be correctly calibrated and the
Link system must be kept in working status.
6. Test the Link system with N2O flow increasing:
a. Turn the O2 and N2O flow controls fully clockwise (minimum flow).
b. Turn the N2O flow control only.
c. Increase the N2O flow gradually and the O2 flow should increase accordingly. The
measured O2 concentration must be
≥ 21% through the full range.
7. Test the Link system with O2 flow decreasing:
a. Set the N2O flow to 9.0 L/min.
b. Set the O2 flow to more than 3 L/min.
c. Slowly turn the O2 flow control clockwise and the N2O flow should decrease
accordingly. The measured O2 concentration must be
≥ 21% through the full range.
8. Cut off the N2O pipeline supply or close the N2O cylinder valve. Turn the O2 and N2O
flow controls counterclockwise respectively and turn on the O2 and N2O flowmeters.
Make sure that there is no residual gas in the N2O pathway and the pressure gauge in the
N2O pathway goes to zero. Then turn the O2 and N2O flow controls clockwise
respectively and make sure that the O2 and N2O flows are at the minimum.
9. Disconnect the O2 pipeline supply or close the O2 cylinder valve.
NOTE

During O2 supply disconection, with the decrease in O2 pressure, alarms of O2
Supply Failure and Drive Gas Pressure Low are triggered.
10. Set the system switch to the position.