Dräger Medical Fabius Tiro Technical & Service Manual page 218

Fabius Tiro
Setting O2 Control Pres-
sure
Adjusting the Operating
Point
Adjusting the O2/N2O
Ratio
O2 Concentration Test:
Flow Test
212
Dräger Medical AG & Co. KGaA
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Adjustment and Calibration Procedures
1. Set the System Power switch to OFF.
2. Remove the two screws that secure the Service access panel near the
rear of the unit.
3. Loosen the two captive screws in the access panel securing the flow
meter bezel assembly. Carefully pull the assembly out of the machine for
access to the SORC.
4. Connect a test pressure gauge to the O2 port on the SORC shown in
ure 4.
5. Connect an oxygen analyzer to the fresh gas outlet.
6. Connect the pipeline supplies.
7. Set the System Power switch to ON.
8. Set the oxygen flow to 200 mL/min.
9. The test pressure gauge should read 25 ±1 cmH2O. If needed, turn the
O2 control pressure adjustment screw until the test gauge reads 25
±1 mbar. Apply a small amount of thread sealant to the screw head.
10. Fully open the N2O flow control valve.
11. Set the oxygen flow to 200 mL/min.
12. The N2O flow should be 50 ± 30 mL/min. Make the following adjustment
if needed:
a) Loosen the lock nut on top of the SORC.
b) Turn the operating point adjustment counter-clockwise to decrease
the N2O flow, or clockwise to increase the N2O flow until it is at 50 ±
30 mL/min.
13. Tighten the lock nut and verify the N2O flow is 50 ±30 mL/min. Apply a
small amount of thread sealant where the lock nut meets the threads of
the adjustment point.
14. With the N2O flow control valve fully open, set the oxygen flow to 1 L/min.
15. The N2O flow should be 3 ±0.3 mL/min, resulting in an O2 concentration
of 25 ± 3 vol.% O2 at the fresh gas outlet.
If needed, turn the N2O flow adjustment screw until the flow is 3 ±
0.3 mL/min, resulting in an O2 concentration of 25 ± 3 vol.% O2 at the fresh
gas outlet. Apply a small amount of thread sealant on the adjustment screw.
16. Verify O2 concentration at the fresh gas outlet, with the O2 flow settings
in the following table
O2 Flow
0.5 ± 0.05 L/min.
1.0 ± 0.1 L/min.
3.0 ± 0.2 L/min.
17. Fully open the N2O flow control valve.
6002.002
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N2O Flow Control
Valve
Fully Open
Revision B Released
Fig-
O2 Concentration
23 - 33
23 - 28
23 - 33