Maintenance
12-7
cylinder is not important; either end can be inserted into the source or
detector housing.
16. Re-assemble the LI-8100A case. Make sure that the foam insulation on the
inside top cover is positioned over the optical bench; it is required for thermal
stability.
17. Perform zero and span calibrations as described in Section 5, User
Calibration.
Replacing the Air Filters
There are two Balston air filters located inside the Analyzer Control Unit. One of
the filters is on the flow path to the attached chamber, and the other is on the
bellows air path, and is used only when the Survey Chamber is attached. The
bellows air path draws air from outside of the Analyzer Control Unit through a port
on the front panel. This port also has a built-in filter, so the Balston air filter on this
line should not need to be changed with any regularity, if at all.
The air filter on the flow path will need to be replaced after about every three
months of continuous use, depending upon the conditions under which the
instrument is used. You can look at the clear Bev-a-line tubing to get a visual
indication of how much dirt is present in the line, or alternatively, if the instrument
zero and span settings are fluctuating widely (see Section 5, User Calibration), it
may be time to change the filter. Follow these steps to replace the Balston air filters
(there are two in the spares kit under p/n 300-01961):
1. Power the instrument off and disconnect the battery or other external power
source.
2. Open the Analyzer Control Unit case and remove the access panel by
loosening the four thumbscrews.
3. Never swap one used filter for another! This is important, as the filter that is
in-line with the bellows air circuit to the Survey Chamber is bi-directional,
meaning dirt can be introduced into the filter in both directions. If this filter is
inserted into the optical bench air path, dirt can be inadvertently blown into
the optical bench.
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