4-10
5. Set the flow controls to mid range. Check that the flowtube float moves smoothly and
that the electronic flowmeter displays normally.
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 as shown in the table. Make sure that the O2 flow
must be greater than the minimum limits.
d. If the N2O flow is set crossing the limit, before continuing the test, turn the O2 flow
control clockwise till the N2O flow decreases to the preset value.
Step N2O flow (L/min) O2 flow (L/min)
1 0.6
≥0.2
2 1.5
≥0.4
3 3.0
≥0.8
4 7.5
≥2.0
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 to set the N2O flow to the rates shown in
the table. Make sure that the O2 flow must be greater than the minimum limits.
d. If the O2 flow is set crossing the limit, before continuing the test, turn the N2O flow
control counterclockwise till the N2O flow increases to the preset value.
Step N2O flow (L/min) O2 flow (L/min)
1 7.5
≥2.0
2 3.0
≥0.8
3 1.5
≥0.4
4 0.6
≥0.2
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.
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