LaMotte DO 4000 Dissolved Oxygen Meter - Manual (Page 20)

CLEANING THE PROBE
THE CATHODE
1. Remove membrane cartridge, wipe probe dry.
2. Lay crocus paper on a table or other flat surface.
3. Holding the electrode vertically, gently move the tip over the crocus
paper in a circular motion.
THE ANODE
1. Remove membrane cartridge.
2. Dip a toothbrush in a dilute ammonia solution.
3. Gently rub toothbrush over the silver anode. Continue until the
deposits have been removed.
4. Rinse with deionized water before reassembly.
5. Reassemble the probe. Wait 15 minutes for probe to polarize before
use.
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