91518 Multigas Analyzer Service Manual 4-5
Maintenance
4 Remove the water trap by pressing the release lever on the right side of the water trap. Pull the water trap
away from its recess.
5 Discard the water trap according to hospital policies.
6 Open the D-fend package and remove the water container by pulling it away from the D-fend body with a
slight twisting motion.
7 Examine the water container’s O-rings to verify that there are no cracks or cuts.
8 Examine the D-fend ports that slip over the front panel connection posts, and verify that the front panel
chambers are smooth and have no slivers or burrs.
9 Press the water container into the D-fend, and press the D-fend into its recessed area on the front panel
until it is latched.
D-fend Connection O-Ring Replacement
An O-ring on each side of the connection post mates with the D-fend water trap. The O-rings can be removed.
To remove the O-rings:
1 Use a hooked dental pick or similar instrument (refer to Figure 4-3) to remove the O-rings from the posts.
Figure 4-3: Removing O-rings
To replace the O-rings:
1 Position the gas analyzer face up.
2 Lay the replacement O-ring on top of the connection post, and press the O-ring onto the post using finger
pressure. Or, position one edge of the O-ring onto the post groove using small, curved needle nose pliers
or tweezers, place a finger over the edge to keep it in the groove, then use you finger to roll the O-ring over
the top of the post.
3 Visually inspect the installation to make sure the O-ring is in the groove, and is not distorted (refer to
Figure 4-4).
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