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30 Troubleshooting
917 Coulometer
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293
Problem Cause Remedy
The sample contains oxi-
dizable substances.
ï¿ Consider using a KF oven.
ï¿ See technical literature.
The parameter Stop drift
is set too low.
ï¿ Set the Stop drift higher or use the Rela-
tive stop drift.
The drift correction is too
small (e.g. for the use of a
KF oven or for manual drift
correction).
ï¿ Start the titration as long as the gas flow
still exists between the conditioning vial
and the titration cell.
ï¿ Set the parameter Drift correction to
auto (= automatic drift correction).
The result is too
low.
The sample releases iodine. ï¿ Consider using a KF oven.
ï¿ See technical literature.
The parameter Stop drift
is set too high.
ï¿ Set the Stop drift lower.
The drift correction is too
large (e.g. with excessively
high start drift, with fluctu-
ating drift or with manual
drift correction).
ï¿ Ensure stable and lower drift.
ï¿ Set the parameter Drift correction to
auto (= automatic drift correction).
The parameter Min. rate
is set too low.
ï¿ Set the parameter Min. rate higher.
ï¿ Reset the Control parameters to default
values.
The results are
spread widely.
The sample is nonhomoge-
nous.
ï¿ Homogenize the sample if possible.
ï¿ Possibly use a larger sample size.
The sample addition is diffi-
cult to reproduce.
ï¿ Observe the instructions in .
The drift fluctuates. ï¿ Ensure stable drift.
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