CETAC M-7600 Mercury Analyzer Operator's Manual

Operator’s Manual
Chapter 5: Maintaining the Mercury Analyzer
exhaust.” If liquid has passed through the system, then proceed with the below
corrective action steps.
3 Remove the sample cell, GLS, and Perma Pure ® cartridge (with all tubing still
attached). Place all parts on a clean lab cloth (or equiv.) on the lab bench.
4 Dismantle the sample cell completely. See page 109.
CAUTION
Do NOT remove the cell window blocks over the optical rail if the cell is wet or full
of water. Do this instead outside the instrument to avoid spillage onto the optical
components.
5 Dump out all water and brine from the sample cell glass tube.
6 Rinse the sample cell glass tube with deionized water and oven dry.
Alternatively, dry by rinsing with alcohol (recommended spectophotometric
isopropyl alcohol (isopropanol)) and blowing dry with clean air, nitrogen, or
argon.
You can supply drying gas from the argon carrier gas source by simply
disconnecting the instrument gas supply and turning down the gas pressure to
create a low flow.
WARNING
The flow used for drying of the optical components must be less than 100
mL/min or extremely low psig such as < 5 psi. If a flow greater than this is
used, the gas could blow the optical parts from your grip and cause
personal injury.
7 Rinse and all remaining cell holder parts, fittings and transfer tubing with
deionized water. Dry these parts by rinsing with alcohol (recommended
spectophotometric isopropyl alcohol (isopropanol)) and blowing dry with
clean air, argon, or nitrogen. Inspect closely to be sure all water, and/or all
residual alcohol is completely eliminated from all fittings, tubes, parts, and gas
ports.
When you re-assemble the cell components and install the cleaned cells, use
new or clean, dry reference and sample cell tubing.
CAUTION
Do not oven dry any of the parts except for the sample cell glass tube. Instead, use
the alcohol rinse/blow-dry procedure. Excessive heat could damage these parts.
8 Clean the sapphire window first with water and then as described on page
109.
9 Reassemble the window and cell end caps. Handle the window with clean
forceps or hold by the edge with fingertips while wearing gloves (verify
cleanliness by inspection with low-angle room light reflection).
10 Install the glass tube into the cell end caps, and seat firmly to fully engage both
O-rings.
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