Replacing The Ph Reference Electrode O-Ring; Replacing The O-Ring - Thermo Scientific Dionex ED50A Operator's Manual

Dionex ED50A Electrochemical Detector
electrode block. Carefully wipe the surface of the block with a soft damp cloth
or tissue.
9. If you used the coarse polishing compound in Step 5, repeat Steps 5 through 7
with the fine compound.
10. Using a moist piece of polishing cloth (with no polishing compound added),
rub the polished surface free of residual polishing compound particles.
11. Inspect the surface of the working electrode to make sure that it is clean. If
necessary, repeat Step 9.
NOTE The polishing pads are reusable. Do not rinse the
12. Reassemble the cell. Reapply the electrode potential(s) and resume eluent
flow. The baseline will drift for more than 1 hour as the cell re-equilibrates.
Peak area values may require up to 12 hours to stabilize.
5.3

Replacing the pH Reference Electrode O-Ring

A defective pH reference electrode O-ring can cause liquid leaks from the pH
reference electrode or compression nut area when the cell operating pressure
is below 700 kPa (100 psi).
5.3.1

Replacing the O-Ring

1. Disconnect the inlet and outlet lines from the amperometry cell and
2. Loosen the cell cover thumbscrew and remove the cover.
3. Disconnect the reference electrode's J2 connector from junction J2 on
4. Unscrew the reference electrode cylinder from the cell body (see
5-4
polishing compound from the pads. After initial use, add
only enough polishing compound to maintain the
coating on the pad.
disconnect the cell's electrical cable. Remove the cell from its
mounting location in the chromatography compartment.
the electronics card (see Figure 5-2).
Figure 5-2).
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