Dräger Narkomed 2B Service Manual page 74

REPLACEMENT PROCEDURES (continued)
4.13.12 Connect the compression fittings to the valve. Be sure the flow
restrictor is in place at the right-angle fitting.
4.13.13 Place the washer and the O
4.13.14 Hold the O
through an access hole in the guard ring. Tighten the set screw.
Rotate the button 180 degrees until the other set screw is visible, and
tighten the set screw.
4.13.15 Disconnect the absorber freshgas hose from the freshgas outlet.
Connect a test gauge and B.P. bulb to the freshgas outlet, and
perform the following test:
4.13.15.1
4.13.15.2
4.13.15.3
4.13.15.4
4.13.15.5
4.13.15.6
4.13.15.7
4.13.15.8
4.13.15.9
4.13.15.10 Connect a volumeter to the freshgas outlet, and reset the
4.13.15.11 Press the O
4.13.15.12 Disconnect the volumeter from the freshgas outlet.
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Flush button on the valve shaft.
2
Flush button in and turn it until a set screw is visible
2
Open the oxygen cylinder valve.
Release any pressure that is indicated on the test gauge.
Over the next 60 seconds, the test gauge should not show
a pressure increase greater than 2 cm H
Increase the pressure to 50 cm H
The pressure should not drop more than 10 cm H
the next 30 seconds.
Disconnect the test gauge from the freshgas outlet.
Open the oxygen cylinder valve and allow the pressure to
stabilize. (The cylinder pressure must be at least 1000 psi
for this test.)
Close the oxygen cylinder valve.
The pressure should not drop more than 50 psi in two
minutes.
volumeter to zero.
Flush button and observe the flow rate. It
2
should be between 45 and 65 liters per minute.
4-42
NM2B
O.
2
O.
2
O in
2
Rev. A