CETAC M-7600 Mercury Analyzer Operator's Manual

5 Maintaining the
Mercury Analyzer
Routine maintenance of the analyzer consists of daily and weekly cleaning of
specific analyzer components. Routine maintenance also includes checking for
leaks or other damage. Additional periodic maintenance tasks may be
required, including replacement of the following analyzer components:
peristaltic pump tubing, sample probe, rinse station tubing, GLS capillaries,
GLS drain tubing and Perma Pure ® dryer cartridge.
CAUTION
Discharge static buildup and ground to the analyzer base or cabinet before
performing any maintenance. Avoid touching the contacts on the communication
ports.
Maintenance Schedule
Daily Maintenance (Always Check Before Analysis)
‣ Ensure the autosampler rinse bottle is rinsed between analytical batches
with small amounts 10% HNO 3 follow by DI water and refilled with
acidified rinse solution. For concentration of standards and samples
greater than 20 µg/L, a 5% HCl / 2% HNO 3 v/v should be sufficient. For
trace to ultra-trace calibrations (such as 0 to 500 ng/L) a rinse solution of
1% HCl / 1% HNO 3 v/v should be sufficient.
‣ Ensure the rinse bottle tubes are completely submerged in rinse solution.
The rinse station supply tubing should be at the bottom of the rinse bottle
and the rinse station return tubing should be at the top of the rinse bottle.
This will ensure that the rinse is a true recirculating rinse. Inspect the
rinse station flow and ensure that the rinse is not removed via the sample
probe faster than it is supplied. If the rinse station is being drained faster
than the supply rate, you may need to adjust the autosampler pump rate in
the method or change rinse pump tubing. Replace the autosampler rinse
pump tubing periodically for best performance (See the Autosampler
Operator’s Manual).
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