GE Analytical Instruments ©2006 15-8 DLM 14291 Rev. A
loosen the nut from the inside of the bulkhead fitting, then use a 1/4” wrench
to loosen the 1/16” nut at the reaction cell. Carefully pull the 1/16” tubing out
of the reaction cell and rinse thoroughly with deionized water. Remove the frit
restrictor and use a squeeze bottle to rinse the bulkhead fitting on the back of
the NOA. Replace the tubing in the reaction chamber, tighten the 1/16” nut
hand tight, connect the 1/8” nut to the bulkhead, then secure both the 1/8
and 1/16” nuts with wrenches. Replace the frit restrictor and tighten with a
wrench.
• There are two o-rings in the reaction cell. The inner o-ring provides the
vacuum seal and the outer o-ring provides the light-tight seal. These o-rings
must be seated in the o-ring grooves of the reaction cell. If the o-rings fall out,
carefully reseat them in the grooves. If the o-rings do not stay in the grooves, a
very small amount of silicone vacuum grease can be applied to the o-rings to
help secure them. Be sure to wipe any excess grease from the o-rings before
replacing the cooler.
• After cleaning the filter and reaction cell, carefully slide the cooler being sure
that the o-rings and red filter remain in place. Slide the cooler back until it
contacts the o-rings on the reaction cell.
• Insert one of the Allen screws into the back panel and through the reaction
cell. The screw should be aligned with the threaded hole in the cooler. If
aligned, then carefully thread the screw by hand into the cooler. If the hole is
not aligned, adjust the position of the cooler to align the hole with the screw.
• Follow the same procedure to install the remaining two Allen screws, carefully
tightening the screw by hand.
• Once all three screws are started, use the Allen wrench to tighten the screws.
Do not overtighten the screws; the optical filter will break! The best
procedure is to hold the Allen wrench by the sort arm, then tighten one screw
2-3 turns, tighten the next screw 2-3 turns, then tighten the last screw 2-3
turn. Continue alternatively tightening the three screws until tight.
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