Table of Contents
Advertisement
3.8
Routine Maintenance
This section describes routine maintenance procedures that can be performed by
the user. Any other maintenance procedures must be performed by qualified
Thermo Fisher Scientific personnel.
NOTE The Dionex ED50A electronic components are not
•
Periodically check liquid line connections to the cells (inside the
chromatography module) for leaks and clean up any spills.
The Dionex ED50A amperometry cells are designed to require minimal
maintenance. If you observe the following precautions, the working electrode
should rarely require polishing.
•
To prevent electrode contamination:
a. Run only clean, filtered samples.
b. Prepare all eluents with high purity deionized water.
c. Avoid contamination of the cell with incompatible eluents.
•
Never apply potential to the electrode unless a stream of eluent or water is
flowing through the cell.
•
Be careful to keep the polished surface of the amperometry cell body clean
and dry. The gold, spring-loaded working electrode contact must also remain
clean and dry. If a salt bridge forms, it can cause an electrical short between
the working electrode contact and the cell body.
•
If the working electrode becomes discolored or if you notice a degradation in
performance (baseline noise, tailing peaks, etc.), polish the electrode as
instructed in Section 5.2.
•
Over the lifetime of the working electrode, the gold, silver, platinum, or
glassy carbon surface may gradually become pitted or receded. Receded
electrodes can be repaired by sanding (use 600 grit sandpaper or similar).
Continue sanding until the metal surface is again flush with the Kel-F
electrode block surface. Then, polish the electrode with the coarse and fine
polishing compounds as instructed in Section 5.2.
Doc. 065551-01 6/13
customer-serviceable. Repair of electronic components
must be performed by Thermo Fisher Scientific
personnel.
3 • Operation and Maintenance
3-15
Advertisement
Table of Contents
