LI-COR LI-6400, Manual

Page: 491 / 846

Maintenance & Service
Chemical Tubes
Using the LI-6400 19-3
Cleaning The End Cap Threads
It is important that the threads be kept very clean. If dust or other debris ac-
cumulates on them, you will have a difficult time putting the end cap on far
enough to compress the O-ring, and the tube will leak.
After you dump out the old chemicals from a tube, use a stiff brush to clean
the threads of both the end cap and the tube barrel. For especially dirty
threads, soak them in water briefly, then wipe them clean and dry.
Do not lubricate the threads. Lubricant will accumulate dust, and aggravate
the problem. When you reassemble the tube, make sure the threads are clean
and dry. No grease, please.
Figure 19-2. Air mufflers in soda lime
and desiccant tubes.
Replacing the Air Mufflers
There are two air mufflers attached to the air hoses inside the chemi-
cal tubes (Figure 19-2). These mufflers may become clogged, re-
stricting air flow through the tubes and thus reducing the maximum
flow rates. (This is one of several things that can reduce flow rates.
See
CanÕt Achieve High Flow Rates on page 20-13.)
To replace the mufflers, remove the bottom cap, empty the chemicals
and then remove the top cap. The old mufflers can then be unscrewed
and replaced with new ones. Do not overtighten the mufflers, as they
can break at the threads very easily. There are air mufflers in the spare
parts kit.
Muffler
Muffler
DESIC
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