A Low Flow Oxygen Ratio Controller (Orc) Adjustment; 5-10A - Dräger Narkomed 2C Technical & Service Manual

NM2C

5.3A Low Flow Oxygen Ratio Controller (ORC) Adjustment

5.3.1A
5.3.2A
5.3.3A
5.3.4A
5.3.5A
5.3.6A
5.3.7A
5.3.8A
5.3.9A
5.3.10A Set the O
5.3.11A Decrease the oxygen flow rate.
5.3.12A If the nitrous oxide flow does not stop when the oxygen flow rate is
5.3.13A Repeat steps 5.3.7A thru 5.3.12A until no further adjustment is
5.3.14A Adjust the oxygen flow to a point where the nitrous oxide flowmeter
5.3.15A The oxygen concentration should be between 21% and 29% oxygen.
5.3.16A Slowly decrease the oxygen flow to 800 ml/min. The nitrous oxide flow
5.3.17A Reduce the O
Rev. D
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ADJUSTMENT AND CALIBRATION PROCEDURES (continued)
Remove the rear cover of the flowmeter housing.
Connect a calibrated oxygen monitor to the fresh gas outlet.
Disconnect the pipeline hoses.
Pinch the N O bypass line on the ORC. See Figure 5-3A.
2
Open the oxygen and nitrous oxide cylinder valves.
Set the System Power switch to ON.
Close the O and N O flow control valves.
2 2
Set the O flow control valve to 10 l/min.
2
Set the N O flow control valve to 10 l/min.
2
flow control valve to 800 ml/min for one (1) minute. Verify
2
that the O concentration indicates 21% to 29% O
2
between 325 and 350 ml per minute, loosen the adjusting screw
locknut and turn the adjusting screw (counter-clockwise to decrease
N O flow, clockwise to increase N
2
needed.
indicates 10 liters per minute.
should decrease proportionally, and the oxygen concentration should
remain between 21% and 29% oxygen.
flow to 500 ml/min. Verify that the N
2
than or equal to 600 ml/min.

5-10A

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O flow). Tighten the locknut.
2
.
2
O flow is greater
2