Metrohm 896 Professional Detector – Amperometry - Manual (Page 41)

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6 Troubleshooting
2.896.0020 896 Professional Detector – Amperometry
￭￭￭￭￭￭￭￭ 33
Problem Cause Remedy
baseline corresponds to the one in the Appli-
cation Works.
Detector parameters –
Potentials set incorrectly. Set the potentials to correspond to the specifi-
cations in the leaflet and in the Application
Works.
Incorrect eluent in the ref-
erence chamber. Remove purge stopper on the measuring cell,
wait until approx. 1 mL of eluent has emerged,
screw the purge stopper back in tightly.
Electrodes contaminated. ￭ Clean and polish working electrode.
￭ Possibly clean the auxiliary electrode.
￭ Replace the reference electrode with a
well-conditioned new reference electrode.
Very noisy baseline. Disruptive influences from
outside. ￭ In the DC mode: Switch on the damping.
￭ In the other measuring modes: Set a suita-
ble smaller measuring range.
￭ Attach the front lid.
Ag/AgCl reference elec-
trode worn out. Replace the reference electrode .
Auxiliary electrode conta-
minated. Clean the auxiliary electrode of the measuring
cell .
Working electrode conta-
minated. ￭ Clean and polish the working electrode
(see the leaflet for the working electrode).
￭ Replace the GC working electrode if it has
been used with oxidative potentials at the
upper limit and polishing no longer helps.
Air bubble in the measur-
ing cell. Deaerate the measuring cell (see Chapter 4.6,
page 24).
Background current too
high, e.g. caused by conta-
minated eluent. Check the background current, e.g. use fresh
eluent.