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Dionex ED50A Electrochemical Detector
•
Do not allow the reference electrode to dry 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, follow the procedure in
Section 3.9.
•
To help determine when the reference electrode needs regenerating or
replacing, monitor the pH value displayed on the
Section C.1.3) or on the Chromeleon 6.8 control panel. Note the pH value
displayed after initial calibration and the first chromatographic run.
Thereafter, if the pH value drifts by 0.5 pH units from the value first observed,
check the reference electrode by following the instructions in Section 4.12.
3.9
Shutdown
•
Whenever the amperometry cell is not being used, remove the pH reference
electrode and store it in a solution of saturated KCl, as instructed in the
procedure below. If the reference electrode is left in the cell and mobile phase
is not being pumped through the cell, the reference electrode frit may partially
dry out. If this occurs, regenerate the electrode by soaking it in a solution of
1 M KCl plus 1 M HCl.
Storing the amperometry cell:
1. Prepare a saturated solution of KCl in deionized water.
2. Remove the cap of the soaker bottle in which the electrode was
3. Fill the soaker bottle at least three-fourths full with the prepared KCl
4. Remove the pH reference electrode from the cell. Remove the
5. Slip the electrode through the hole in the soaker bottle lid until the
6. Screw the soaker bottle lid, with the electrode attached, onto the
7. Store the assembly in the original shipping box.
3-16
shipped.
solution.
electrode sealing O-ring and O-ring retainer and save them.
electrode cap bottoms out on the top of the lid.
soaker bottle.
screen (see
DETAIL
Doc. 065551-01 6/13
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