41
Fluoride Ion Selective Electrode User Guide
Troubleshooting Checklist
•
No electrode fi lling solution added –
Fill the electrode with fi lling solution up to the fi ll hole.
Refer to the
Electrode Preparation
section for details.
•
Incorrect electrode fi lling solution used –
Refer to the
Electrode Preparation
section to verify the
correct electrode fi lling solution.
•
Electrode junction is dry –
Push down on the electrode cap to allow a few drops of
fi lling solution to drain out of the electrode.
•
No reference electrode present –
The 9409BN and 9409SC fl uoride half-cell electrodes
require a separate reference electrode, Cat. No. 900100.
•
Electrode is clogged or dirty –
Refer to the
Electrode Maintenance
section for cleaning
instructions.
•
Standards are contaminated or made incorrectly –
Prepare fresh standards. Refer to the
Measurement Hints
and
Analytical Techniques
sections.
•
TISAB not used or incorrect TISAB used –
TISAB must be added to all standards and samples. Refer
to the
Required Equipment
section for information on
TISAB solutions.
•
Samples and standards at different temperatures –
Allow solutions to reach the same temperature.
•
Air bubble on sensing element –
Tap the electrode gently to remove the air bubble or
remove the electrode from the solution and immerse again.
•
Electrode not properly connected to meter –
Unplug and reconnect the electrode to the meter.
•
Meter or stir plate not properly grounded –
Check the meter and stir plate for proper grounding.
•
Static electricity present –
Wipe plastic parts on the meter with a detergent solution.
•
Defective meter –
Check the meter performance. See the meter user guide.
