Dräger Narkomed 2B, Руководство по обслуживанию, Страница: 49 / 308

NM2B REPLACEMENT PROCEDURES (continued)
4.5.13 Loosen the screw directly above the flowmeter tube to be replaced.
Turning the screw counter clockwise will raise the upper flow tube
retainer. Raise the retainer far enough to be able to pull the top of
the tube outward, and remove the tube.
NOTE: If the bottom of the tube is seated in a flow restrictor, be
sure that the arrangement of the restrictor and its
gaskets is not disturbed.
4.5.14 Make sure that the replacement flow tube bears the correct markings
and has a ball.
4.5.15 Place the bottom of the flowmeter tube into the guide ring of the
lower gasket seal, and position the top of the flow tube into the center
guide ring of the top gasket seal. It will be easier to hold the tube if
the adjacent lighting channel is pulled forward and temporarily
removed.
CAUTION: The flowmeter tube must be properly centered over the
guide rings or damage to the flowmeter tube may occur.
4.5.16 Ensure that the markings on the flow tube are facing forward, and
turn the upper retainer screw clockwise until the flow tube is firmly
held in place.
CAUTION: Do not over-tighten the screw as the flowmeter tube may
break.
4.5.17 Perform the following leak test on the system:
4.5.17.1 Disconnect the absorber hose from the freshgas outlet.
4.5.17.2 Connect a test gauge and B.P. bulb to the freshgas outlet,
and pressurize the system to 50 cm H
2
O.
4.5.17.3 The pressure should not drop more than 10 cm H
2
O in
thirty seconds.
4.5.18 Disconnect the test gauge and re-connect the absorber hose to the
freshgas outlet.
4.5.19 Replace any lighting channels that were previously removed.
Rev. A
4-17
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