Unit fails to
calibrate, even
with new sensor.
Calibration settings outside
of allowable limits due to
previous failed calibration.
Initialise the unit. See section
15.
Unit attempts
Span calibration
instead of Zero
calibration.
Sensor has Zero error.
Thoroughly rinse sensor in
distilled water and allow to
completely dry in air before
attempting zero calibration.
If instrument does not
calibrate at Zero with sensor
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. Sensor is not immersed
deeply enough.
2. Sensor may have a build-
up of dirt or oily material
on sensor wires.
3. Platinum-black coating
has worn off.
4. Standard solution is
inaccurate.
5. Sensor is faulty.
6. Faulty instrument.
7. k-factor incorrectly set if
using k=0.1 or k=10
sensor.
Immerse sensor at least to
the vent hole in the white
plastic cover.
Clean sensor, as per the
instructions detailed in
section 18.1.
Sensor requires
replatinisation.
Return to the factory, or see
details in section 18.2.
Replace standard solution.
Return sensor to factory for
repair or replacement.
Return to factory for repair.
Set the correct k-factor, as
per section 14.
Continued next page...
Page 36
17.2
Conductivity/TDS/Salinity Troubleshooting
Symptom
Possible Causes
Remedy