Flowmeters - Dräger Narkomed 2C Technical & Service Manual

REPLACEMENT PROCEDURES (continued)
4.5

Flowmeters

The flowmeter tubes are held by compression in gaskets at the top and bottom
of each tube. Each upper gasket is seated in an adjustable retainer that allows
removal of the tube as shown in Figure 4-5. Access to the flow tubes and their
retainers requires removal of the plexiglass cover on the gas instrumentation
panel.
4.5.1 Disconnect all pipeline hoses and set the System Power switch to ON.
4.5.2 Close all cylinder valves except the O
4.5.3 Set the oxygen flow to 5 liters per min.
4.5.4 Open the other gas flow control valves to drain pressure from the
system.
4.5.5 Close the O
the O
4.5.6 Set the System Power switch to STANDBY.
4.5.7 Remove the screws holding the table top to the machine and lift out
the table top.
4.5.8 Remove the six screws holding the flowmeter shield and vapor box
front cover panel, and pull the panel forward approximately ½ inch.
4.5.9 Remove the oxygen flow control knob. The knob has two setscrews.
NOTE:
4.5.10 Remove the two screws holding the knob guard in place, and remove
the knob guard.
4.5.11 Carefully remove the plexiglass cover from the front of the flowmeter
housing.
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cylinder valve, and close the flow control valves. Press
2
Flush valve to drain oxygen pressure from the system.
2
If the knob must be rotated to allow access to a setscrew,
carefully note its position so that it can be re-assembled
in the same position with the "Off Stop" properly set.
4-16
valve.
2
NM2C