CETAC M-7600 Mercury Analyzer Operator's Manual

CETAC QuickTrace M-7600 Mercury Analyzer
Chapter 5: Maintaining the Mercury Analyzer
Figure 5-8 O-Ring NOT Engaged.
B - O-ring is visible E - Cell end
An alternate means of checking complete engagement of all O-rings in both
cells is to measure the overall length of the fully assembled cell with a ruler. If
the overall assembled cell length is: 8 29/32 inches (226.5mm), then both O-
rings are engaged; 8 31/32 inches (228mm) indicates one O-ring is not
engaged; 9 1/32 inches (229.5mm) indicates that two O-rings are not engaged
(one in each end).
CAUTION
The glass tubing is sufficiently thick-walled that there is almost no danger of
breakage (provided you have gripped near the end being inserted). However, for
maximum safety, grip the glass tube with a sufficient thickness of cloth or paper
towel to protect your hands in the unlikely event of glass breakage. Never insert or
try to use a cracked or chipped glass tube.
Once the cell has been completely assembled, with both O-rings fully engaged,
place the cell on a flat surface with both cell end cap “flats” facing downward.
Rotationally adjust the cells until both “flats” are flat against the surface and
parallel with each other. Recheck O-ring engagement (as above) and re-inspect
both windows under low-angle reflection illumination to verify that no
residual dust, lint, fingerprints, or other smudges exist on the windows. If both
windows are “clean”, attach the appropriate Viton ® interconnect tubing and
reinstall the cells.
To reinstall the clean (and/or re-tubed) sample cell, first check that the two
cell holder “flats” are parallel to each other. A simple check will reveal both cell
end cap flats to be completely “tight down” against a flat surface with no gap
visible between the end cap and the flat surface, when parallel.
Finally, reconnect the tubing and the optical cabinet cover.
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