Page 35
Conductivity and TDS Troubleshooting, continued...
Standard calibration
fails, and k factor
is less than 0.075,
0.75 or 7.5,
(depending on k
factor of sensor).
1.
White protective cover is
not fitted or upside down.
2.
Standard solution is
inaccurate.
3.
Electrode may have a build-
up of conductive material,
such as salt.
4.
Electrode is faulty.
5.
Faulty instrument.
6.
k-factor incorrectly set if
using k=0.1 or k=10 sensor.
The white protective cover
MUST be fitted for correct
readings. The vent hole must
be towards the cable end of the
electrode.
Replace standard solution.
Clean electrode, as per the
instructions detailed in section
20.1.
Return electrode to factory for
repair or replacement.
Return to factory for repair.
Set the correct k-factor, as per
section 14.
Inaccurate readings,
even when
calibration is
successful.
1.
Electrode may have a build-
up of dirt or oily material
on electrode wires.
2.
Platinum-black coating has
worn off.
Clean electrode, as per the
instructions detailed in section
20.1.
Electrode requires
replatinisation.
Return to the factory, or see
details in section 20.2.
Readings drift.
1.
Electrode may have a build-
up of dirt or oily material
on electrode wires.
Clean electrode, as per the
instructions detailed in section
20.1.
Readings are low or
near zero.
1.
Electrode may have a build-
up of dirt or oily material
on electrode wires.
2.
Electrode is not immersed
deeply enough.
3.
Electrode is faulty.
4.
Faulty instrument.
5.
k-factor incorrectly set if
using k=0.1 or k=10 sensor.
Clean electrode, as per the
instructions detailed in section
20.1.
Immerse electrode at least to
the vent hole in the white
plastic cover.
Return electrode to factory for
repair or replacement.
Return to factory for repair.
Set the correct k-factor, as per
section 14.