Hach AutoCAT 9000 - Accuracy and Warning Signs

Troubleshooting
Troubleshooting
Page 144
50081_Troubleshooting.fm
Accuracy of
Analysis
Results
The
concentration
for a known
standard
solution
obtained using
the AutoCAT
9000 does not
match its
actual value.
If the measured
concentration does not
match actual value (within
an acceptable uncertainty
range) then the
concentration of the titrant
currently installed on the
instrument is probably
wrong or the wrong
sample volume has been
entered.
• Confirm that the correct titrant concentration has been
entered into the instrument.
• Confirm that the titrant concentration has the correct units.
• Confirm that the correct sample volume has been entered.
• Restandardize the titrant using the embedded calibration
procedure.
• Replace the current bottle of titrant with a fresh bottle of
titrant and enter the proper titrant concentration for the new
titrant.
Warning
Signs
“Stormy” icon
on Titrant Tab
Indicates that there is a
problem with the titrant or
burette.
• The stormy icon may appear due to many related causes. To
correct the problem complete the following sequence:
1. Verify that the desired method has been selected.
2. Verify that the burette has been properly installed in the
software.
3. Verify that the correct titrant has been installed.
4. Verify that the titrant concentration has been properly set by
either entering the value manually or by running the
appropriate calibration routine.
If the stormy icon appears
immediately after
selecting a new method,
then it indicates the
currently installed titrant is
not appropriate for the
newly selected method.
• Install the appropriate titrant and then enter the titrant
concentration, or run the titrant calibration routine. See
Setting Titrant Concentration on page 40.
“Stormy” icon
on Electrodes
Tab
Indicates that the
electrode and/or the
temperature sensor have
not been properly
installed in the software.
• Install (connect) the electrode and temperature probe in the
software. See Software Setup for Electrode and Temperature
Sensor Installation on page 34.
Question Mark
on Titrant Tab
Indicates that the titrant
calibration is about to
expire.
• Recalibrate the titrant or reset the titrant concentration to the
correct value.
Problem
Category
Symptom Probable Cause Corrective Action