cytiva ÄKTA pilot 600 Operating Instructions Manual page 164

7 Maintenance
7.2 Cleaning procedures
7.2.4 Clean and store the pH electrode
Step
1
2
3
If the electrode performance is still unsatisfactory, replace the electrode.
Storing the electrode
Store the electrode in the storage position in a 1:1 mixture of pH 4 buffer and 1 M KNO
whenever it is not in use. Check periodically that the electrode tip is submerged in the
storage solution.
Reconditioning a dry electrode
If the electrode tip dries out it is important to restore the hydrated glass layer. Use the
following method to regenerate a dried-out pH electrode.
Step
1
2
3
If the electrode performance is still unsatisfactory, replace the electrode.
164
Action
Heat a 1 M KNO solution to 60°C to 80°C.
3
Place the electrode tip in the heated KNO
Allow the electrode to cool while immersed in the KNO
testing.
Action
Rinse the electrode carefully with deionized water.
Soak the electrode in 0.1 M HCl for 1 hour.
Soak the electrode overnight in pH 4 buffer.
solution.
3
solution before re-
3
ÄKTA pilot 600 Operating Instructions 29261688 AC
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