Hach TitraLab AT1102, User Manual

Page: 51 / 80

Section 9 Troubleshooting
Refer to the following tables for problem messages and possible causes and solutions.
Table 9 Measurement
Error/Warning Description Possible solution
Measurement unstable
The measurement from the sensor is not
stable Make sure that there are no bubbles around the
sensor element or junction
Measurement out of range
The sample concentration is outside the
sensor measurement limits
Adjust the sample preparation to be inside the
sensor measurement range
Use a different sensor with a more applicable
measurement range
Temperature out of range
The sample temperature is outside the
sensor measurement limits
Adjust the sample temperature to be inside the
sensor measurement range
Use a different sensor with a more applicable
measurement range
Make sure that the sensor is operating correctly
Max. ordinate reached
The titration is stopped because the
measured signal is above or below the
ordinate stop point set for this application,
depending on the curve direction
Refer to the application note for best practices
and do the titration again
Adjust the maximum ordinate for the application
(refer to
Change application parameters
on page 63)
Below minimum range
This message is specific to amperometric
applications; the equivalence point has not
been found
Select an application range more adapted to the
sample
Above maximum range
This message is specific to amperometric
applications; the equivalence point has not
been found
Select an application range more adapted to the
sample
Insufficient curve resolution
This message is specific to amperometric
applications; the equivalence point has not
been found
Refer to the application note for best practices
and do the titration again
Clean the sensor using the recommended
procedures in the sensor documentation
Not enough excess titrant
This message is specific to amperometric
applications with back titration; the
equivalence point has not been found
Refer to the application note for best practices
and do the titration again
Check the excess titrant defined in the
application file and adjust if necessary or select
an application range more adapted to the
sample
Too much excess titrant
This message is specific to amperometric
applications with back titration; the
equivalence point has not been found
Refer to the application note for best practices
and do the titration again
Check the excess titrant defined in the
application file and adjust if necessary or select
an application range more adapted to the
sample
Flat signal
The titration is stopped because the amount
of sample is below the detectable limit of the
application
Refer to the application note for best practices
and do the titration again
Select an application range more adapted to the
sample
Analysis skipped
The titration has been stopped manually by
the user; the equivalence point has not been
found
Preferably use an automatic end titration
detection instead of a manual skip
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