Oxygen Ratio Monitor/Controller - Dräger Narkomed 2B Service Manual

REPLACEMENT PROCEDURES (continued)
4.10

Oxygen Ratio Monitor/Controller

The oxygen ratio monitor/controller (ORMC) is located in the vapor box and is
accessible by removing the rear cover panel above the vaporizer mounts.
Figure 4-10 shows the location of the ORMC mounting screws and connections.
Test and adjustment instructions are included in the following procedure.
NOTE: Steps marked with an asterisk (*) do not apply to later model
machines that do not have the O
channel.
4.10.1 Disconnect all pipeline hoses and set the System Power switch to ON.
4.10.2 Close all cylinder valves except the O
4.10.3 Set the oxygen flow to 5 liters per min.
4.10.4 Open the other gas flow control valves to drain pressure from the
system.
4.10.5 Close the O
O
4.10.6 Set the System Power switch to STANDBY.
4.10.7 Remove the four screws holding the vapor box rear cover, and remove
the cover.
4.10.8 Remove the two screws holding the ORMC to the bottom of the vapor
box.
4.10.9 Remove the four screws holding the bottom plate of the vapor box,
and remove the plate to gain access to the ORMC connections.
4.10.10 Disconnect the flexible O
disconnect the flexible N
switch. (Later models do not have the MPL switch.)
* 4.10.11 Cut the tie-wrap clamp on the in-line wiring harness connectors, and
separate the two ORMC connections.
4.10.12 While holding the ORMC, carefully disconnect the compression
fittings on the N
4.10.13 Disconnect the remaining flexible N
the front of the ORMC. (Later models do not have the tee fitting.)
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cylinder valve and the O
2
Flush valve to drain oxygen pressure from the system.
2
O lines.
2
4-30
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/N O ratio lamp on the alarm
2 2
valve.
2
flow control valve. Press the
2
tubing from the left side of the ORMC, and
2
O tubing from the right side of the MPL
2
O tubing from the tee fitting at
2
NM2B
Rev. A