Cylinder Pressure Regulator Adjustment - Dräger Medical Fabius Tiro Technical & Service Manual

Adjustment and Calibration Procedures
1 Cylinder Pressure
Regulator Adjust-
ment
Dräger Medical AG & Co. KGaA
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1. Set the System Power switch to OFF.
NOTE
Minimum cylinder pressures for this adjustment shall be
N2O: 700 psi; O2 or Air: 1000 psi.
NOTE
Figure 1 shows test connections for the O2 regulator adjustment. If you
are adjusting the N2O regulator, connect the test gauge in series with the
N2O pipeline hose.
2. Connect test pressure gauge (P/N 4114807) between machine's pipeline
inlet connector and the pipeline supply hose.
3. Open the cylinder valves and set the System Power switch to ON.
4. Set the oxygen flow to 4 liters per min. (If you are adjusting the N2O reg-
ulator, also set the nitrous oxide flow to 4 liters per minute.)
5. Depress the push button on the test device.
6. Release the push button. After the pressure decay stabilizes, the gauge
should indicate 32 - 40 psi.
NOTE
If the Core Unit is wall mounted, refer to the
Procedure prior to performing the following step.
7. Remove the Service Access Panel at the rear of the unit. Refer to
1.
8. Remove the acorn nut from the regulator to expose the adjusting screw.
For N2O, turn the screw until the test gauge indicates 35 psi. (50 psi for
CSA machines). For O2 and Air, use the compensated regulator output
setting based on the cylinder pressure given in the following table.
CAUTION
Based on information supplied by the cylinder regulator manufac-
turer, when the regulator is used for O2 or Air, its output pressure will
decrease 0.5 psi for every 100 psi increase in cylinder pressure above
1000 psi. Currently, these pressure regulators are calibrated at 35 psi
with a cylinder supply of 1000 psi. If a 2000 psi cylinder is then
installed, the regulator output will be 42 psi. This change in output
must be compensated for to provide accurate performance through-
out the cylinder's working range.
6002.002
Fabius Tiro
Wall Mount Service Access
Revision B Released
Figure
205