Tailing Peaks; Amperometry Cell Ph Readout Always 7.0 - Thermo Scientific Dionex ED50A Operator's Manual

Dionex ED50A Electrochemical Detector
•
(DC Amperometry and Integrated Amperometry modes)—Regular
baseline oscillation on high-sensitivity ranges
Reconnect the short length of titanium tubing to the cell inlet.
•
(DC Amperometry and Integrated Amperometry modes)—Dirty or
pitted working electrode
If a disposable working electrode is being used, replace it. If the working
electrode is non-disposable, polish it (see Section 5.2).
•
(Integrated Amperometry mode)—Regular baseline oscillations
The water used to prepare the eluent contains trace contaminants. Remake the
eluent, using high purity deionized water containing no contaminants.
4.5

Tailing Peaks

•
(DC Amperometry and Integrated Amperometry modes)—Dirty or
pitted working electrode
Clean the working electrode with solvent (methanol) and rinse with deionized
water. Dry with a clean soft cloth or tissue.
If a disposable working electrode is being used, replace it. If the working
electrode is non-disposable, polish it (see Section 5.2).
4.6

Amperometry Cell pH Readout Always 7.0

The pH reading is displayed on the
•
Short circuit in pH reference electrode
Check connections to the cell pre-amp board:
1. Disconnect the inlet and outlet lines from the amperometry cell and
2. Loosen the cell cover thumbscrew and remove the cover.
4-4
disconnect the cell's electrical cable. Remove the cell from its
mounting location in the chromatography compartment.
screen (press
DETAIL
, ).
Menu 2
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