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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 rear cover, and remove the cover.
NOTE:
4.5.8
Remove the screws holding the table top to the machine and lift out
the table top.
4.5.9A
Early models: Remove the two screws (from the back) holding the
front plate at the top of the plexiglass cover. Hold the front plate as
the screws are removed from the back.
4.4.9B
Later models (without the O
screws holding the flowmeter shield and vapor box cover panel, and
remove the panel.
4.5.10
Remove the O
NOTE:
4.5.11
Remove the two screws holding the knob guard in place, and remove
the knob guard. (For earlier machines with the bar-type knob guard,
the screws holding the guard assembly are accessible through the
back 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
Steps 4.5.8, 4.5.10, and 4.5.11 apply to later machines
with a one-piece flowmeter and gauge cover.
flow control knob. The knob has two setscrews.
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
/N
O ratio alarm lamp): Remove the six
2
2
NM3
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