horiba LAQUA-PC1500, Instruction Manual

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Maintenance and Storage
62
● Maintenance and Storage of Electrodes
This section describes an overview of the procedures for maintenance and storage of pH, ORP
and conductivity electrodes. For the detailed procedures, refer to the instruction manual for
each electrode.
● How to clean the electrodes
When the tip of an electrode (responsive membrane and liquid junction) becomes dirty, the
response time may slow or an error may occur in the measurement results. To avoid such
errors, clean the electrode. For dirt that cannot be washed off by pure water (or deionized
water), use the cleaning solution indicated below depending on the type of dirt. After cleaning,
rinse the electrode with pure water (or deionized water).
However for pH and ORP electrodes, different cleaning solutions should be used to clean
different types of dirt.
For pH Electrode
For ORP Electrode
Type of dirt Cleaning solution
General Diluted neutral cleaning solution
Oil Alcohol, or diluted neutral cleaning solution
Inorganic
substance
1 mol/L HCl or electrode cleaning solution (model 220)
Protein Cleaning solution including protein-removing enzyme (model 250)
Alkaline
Dip in 1 mol/L HCl or electrode cleaning solution (model 220) for 1h to
2 h
Type of dirt Cleaning solution
General
Dilute neutral cleaning solution (General dishwashing liquid
works reasonably well.) Oil
Inorganic substance Immerse dilute nitric acid (1:1 nitric acid)