Ametek 241CE II Operator's Manual page 128

6-14 | Model 241CE II Hydrocarbon Dewpoint Analyzer
5. Remove the (8) M6 X 20 screws securing the Measuring (Sample) Cell
to the Opto-Ring Assembly.
Remove the Measuring Cell from the Opto-Ring Assembly by rotating
and pulling it straight out from the Opto-Ring Assembly.
!
The tolerances between the two parts are very fine. When removing
the Measuring Cell, take care to avoid binding them together, which
CAUTION
can damage the o-ring.
6. If the o-ring (P/N 300-4511) is still present in the Measuring Cell,
remove it using an o-ring removal tool or a small, blunt instrument to
avoid damaging the groove.
!
If the o-ring sticks to the epoxy mirror support, remove it from the
support using only your fingers. Do not use a sharp probe as it can
CAUTION
damage the o-ring, o-ring groove, mirror support, or mirror.
Inspect the o-ring for damage, such as nicks, cuts, or scratches. Typi-
cally, AMETEK recommends replacing the o-ring annually, or any time
the Measuring Cell is disassembled.
!
The mirror support is an epoxy resin, the optic-path windows are
made of polycarbonate, and the Measuring Cell and mirror are made
CAUTION
of aluminum. Do not use any solvents that may damage these materi-
als. Isopropanol is a suitable cleaning agent.
Take care to avoid scratching or otherwise damaging the mirror
surfaces. If it is scratched or damaged, it will have to be replaced to
ensure accurate measurements.
7. If the interior of the Measuring Cell is severely contaminated, wash it
and the mirror support using cotton swabs and a diluted solution of
a non-abrasive agent (such as Isopropanol). Gently wipe the mirror
surfaces with cotton swabs soaked in Isopropanol. Clean the sample
gas inlet and outlet channels.