Discolored Ph Reference Electrode; Leaking Ph Reference Electrode - Thermo Scientific Dionex ED50A Operator's Manual

Electrochemical detector

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Dionex ED50A Electrochemical Detector

•

Uncalibrated reference electrode

Calibrate the reference electrode from the

Section 5.4).

•

Contaminated reference electrode

Soak the reference electrode in a solution containing 1 M KCl and 1 M HCl.

Replace the electrode (P/N 046333) (see Section B.5 for instructions).

•

Dry reference electrode

Replace the electrode (P/N 046333) (see Section B.5 for instructions).

To prevent a reference electrode from drying out, make sure that mobile phase

is always being pumped through the cell. If the cell will not be used for a short

time (less than 2 days), disconnect the tubing from the inlet and outlet fittings

and install fitting plugs. For longer shutdowns, remove the electrode from the

cell and store it in its storage bottle filled with saturated KCl solution. See

Section 3.9 for detailed instructions.

4.10 Discolored pH Reference Electrode

A slightly discolored reference electrode may continue to function within normal

specifications. However, discoloration indicates reference electrode drift. If you

observe problems with amperometric detection and the reference electrode

appears discolored, perform the potential shift test described in Section 4.12. The

reference electrode typically lasts 6 months in normal use.

•

Defective pH reference electrode O-ring

Replace the pH reference electrode O-ring (see Section 5.3).

4-6

screen (see

pH CALIBRATION

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