Troubleshooting; Error Messages - Hach TitraLab Total Hardness Basic User Manual

Troubleshooting

Error messages

Error displayed Cause
The maximum volume is
reached before the
Maximum volume
titration is completed.
reached.
The titration is cancelled
automatically.
No equivalence points
found during titration.
Equivalence points
not found.
Total Hardness value
below measuring range.
No results are stored or
Data logger empty. no results match the
search filter.
All data will be All data in the data log
erased. will be erased.
Printer is connected but
Printing error.
not activated.
Computer is activated
PC not connected.
but not connected.
Defective electrode and/
Unstable mV reading. or insufficient
immersion.
English 15
Resolution
Empty the titration cell and
restart the titration.
Check the system with a
calcium standard of known
concentration (for example
40 ppm of total Hardness)
Verify that, after TRIS addition,
the pH of the sample is
between 9.5-10.
Check the electrode according
to manufacturer
recommendations, maintain
electrode as required. Check if
porous diaphragm is covered by
the sample.
Change the search filter criteria.
Switch on the printer.
Check the computer
connection.
Check electrode according to
manufacturer
recommendations, maintain
electrode as required. Check
sensitive part of electrode is
covered by sample.
Incorrrect results
Incorrect results Cause
The selected units and
The result differs from
the factor introduced for
the expected value
them is not correct.
Resolution
In case of problems or wrong
results it is always
recommended verify that the
titration has finished correctly
adding, after the analysis, some
drops of Hardness 2 Solution
(P/N 425-32). Blue color
indicates that the titration has
finished properly. If not, verify
all the points mentioned in this
section.