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Thermo Scientific Orion Star LogR™ Meter User Guide
Appendix C
Advanced Orion Star LogR
Meter’s Electrode Diagnostics
Electrode Trouble-Shooting Using LogR Technology
Many factors affect the performance of your pH combination electrode. While the
majority of problems seen in electrode performance relate to reference issues,
changes over time in the sensing glass can negatively impact performance. Thermo
Scientific Orion Star LogR meters allow you to monitor these effects. This can save
time, helping to identify cases where cleaning and maintenance will not be able to
rejuvenate your electrode.
Viewing Electrode Resistance
To view the electrode resistance, the third line of the display, indicating the
temperature reading and compensation setting, should show
. If
or
is shown, refer to the user guide, chapter 5
Temperature Reading and
Compensation Settings
section, to change this setting. With
displayed on the
third line, press
to move the arrow icon to the second line and press
/
to display the resistance value.
Out-of-the-box electrode check
This is a quick check to diagnose a bad electrode from the start.
1. Remove the pH electrode from the box.
2. Connect the pH electrode to the meter.
3. Read the resistance value.
a. If this is 0, the electrode needs to be replaced.
b. Otherwise, follow the instructions in the electrode manual to fill and prepare
the electrode for measuring. Perform the initial electrode check when the
electrode is ready.
