Chapter 6 Maintenance and Troubleshooting
6.1 pH (ORP) electrode maintenance
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HORIBA
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Washing the electrodes
If the tip of the pH electrode is extremely dirty, the speed of its response
may slow and it may cause errors in measurement. If the electrode is so
dirty that it cannot be cleaned by rinsing with pure (de-ionized) water,
wash the electrode using the most appropriate method below.
General dirt & oily grime
Wipe the dirt/grime off using cotton gauze that contains a neutral
detergent.
Inorganic grime
Rinse using a hydrochloric acid solution or cleaning liquid #220 of
approximately 1 mol/L. Be sure not to soak the electrode in strong acid
for a long period of time.
1 mol/L hydrochloric acid solution is made by diluting commercially available
concentrated hydrochloric acid by a factor of ten.
