Thermo Products REDOX/ORP 9678BNWP - Manual (Page 20)

 Redox/ORP Electrode User Guide
Troubleshooting
Follow a systematic procedure to isolate the problem. The
measuring system can be divided into four components for ease
in troubleshooting: meter, electrode, sample/application
and technique.
Meter
The meter is the easiest component to eliminate as a possible
cause of error. Thermo Scientific Orion meters include
an instrument checkout procedure and shorting cap for
convenience in troubleshooting. Consult the pH meter user
guide for directions.
Electrode
1. Thoroughly rinse the electrode with distilled water.
2. Place electrode in the Orion ORP standard and wait until
the reading stabilizes.
3. The mV potential should be 220 mV ± 60 mV. If the mV
reading is out of range, repeat the measurement with
fresh ORP standard. If the electrode fails this procedure,
clean the electrode thoroughly as directed in the Electrode
Maintenance section. If the electrode response is slow
or drifting and the electrode is refillable, drain and refill the
electrode with fresh filling solution. Replace the electrode
if cleaning and maintenance fail to rejuvenate it.
Sample/Application
The electrode and meter may operate with standards, but not
with the sample. In this case, check the sample composition for
interferences, incompatibilities or temperature effects.
Technique
If trouble persists, review operating procedures. Review
calibration and measurement sections to be sure proper
technique has been followed.