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10.2 Conductivity and TDS Troubleshooting
Symptom
Possible Causes
Remedy
Unit fails to
calibrate, even with
new electrode.
Calibration settings outside of
allowable limits due to previous
failed calibration.
Initialise the unit. See section 9.
Unit attempts Span
calibration instead
of Zero calibration.
Electrode has Zero error.
Thoroughly rinse electrode in
distilled water and allow to
completely dry in air before
attempting zero calibration.
If instrument does not calibrate
at Zero with electrode
disconnected, then the
instrument is faulty.
Standard calibration
fails, and k factor is
greater than 0.133,
1.33 or 13.3
(depending on k
factor of sensor).
1.
Electrode is not immersed
deeply enough.
2.
Electrode may have a build-
up of dirt or oily material on
electrode plates.
3.
Platinum-black coating has
worn off.
4.
Standard solution is
inaccurate.
5.
Electrode is faulty.
6.
Faulty instrument.
7.
k-factor incorrectly set if
using k=0.1 or k=10 sensor.
Immerse electrode at least to the
vent hole in the glass body.
Clean electrode, as per the
instructions detailed in section
11.1.
Electrode requires
replatinisation.
Return to the factory, or see
details in section 11.2.
Replace standard solution.
Return electrode to factory for
repair or replacement.
Return instrument to factory for
repair.
Set the correct k-factor, as per
section 8.
Standard calibration
fails, and k factor is
less than 0.075, 0.75
or 7.5 (depending
on k factor of
sensor).
1.
Standard solution is
inaccurate.
2.
Electrode may have a build-
up of conductive material,
such as salt.
3.
Electrode is faulty.
4.
Faulty instrument.
5.
k-factor incorrectly set if
using k=0.1 or k=10 sensor.
Replace standard solution.
Clean electrode, as per the
instructions detailed in section
11.1.
Return electrode to factory for
repair or replacement.
Return instrument to factory for
repair.
Set the correct k-factor, as per
section 8.
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