
NM2B
REPLACEMENT PROCEDURES (continued)
4.4
Cylinder and Pipeline Pressure Gauges
Replacement of the cylinder and pipeline pressure gauges requires that the
plexiglass front cover be removed from the gas instrumentation panel, and also
the rear cover for access to the gauge connections. Figure 4-4 shows
disassembly and mounting details.
4.4.1
Disconnect all pipeline hoses and set the System Power switch to ON.
4.4.2
Close all cylinder valves except the O
2
valve.
4.4.3
Set the oxygen flow to 5 liters per min.
4.4.4
Open the other gas flow control valves to drain pressure from the
system.
4.4.5
Close the O
2
cylinder valve, and close the flow control valves. Press
the O
2
Flush valve to drain oxygen pressure from the system.
4.4.6
Set the System Power switch to
STANDBY
.
4.4.7
Remove the screws holding the rear cover, and remove the cover.
4.4.8
Remove the screws holding the table top to the machine and lift out
the table top.
4.4.9A
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
2
/N
2
O ratio alarm lamp): Remove the six
screws holding the flowmeter shield and vapor box cover panel, and
remove the panel.
4.4.10
Remove the O
2
flow control knob. The knob has two setscrews.
NOTE:
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.
4.4.11
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.)
4.4.12
Remove the screws holding the plexiglass cover over the flow tubes
and gauges, and carefully remove the cover.
Rev. A
4-11
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