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Figure 4 Replace the membrane
8.2 Electrode rejuvenation
After some months of operation (3 to 12 depending on sample oxygen concentration, plant shutdown
frequency, etc.), a dark coating of silver bromide (AgBr) may cover part of the silver anode. This
coating does not affect the measurement unless more than 90% of the surface is contaminated.
When changing the electrolyte and membrane, visually check the silver anode. If more than 2/3 of
the surface is coated with silver bromide then an electrode rejuvenation is required. To do this, very
softly polish the areas coated with the deposit using a soft abrasive (N° 400 to 600). After polishing,
rinse with demineralized water and wipe dry with a soft cloth. Some of the dark coloring may be left
to improve sensor stabilization time.
After cleaning, replace the sensor in the sample and leave for 30 minutes for the measurement to
stabilize. Once stable, the sensor must be calibrated.
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