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11. Maintenance
Generally speaking, if normally operate, the controller produced by our company
need no maintenance expect regular cleaning and calibration of the electrode, in order
to ensure accurate and stable measurement value and normal system operation.
The cleaning cycle for the electrode depends on the pollution degree of the
tested water sample. Generally speaking, it is recommended to make weekly cleaning.
The following chart gives introductions of different cleaning methods in light of
difference pollutions, in order to provide the operators with reference for cleaning and
maintenance.
Pollution types Cleaning methods
In the testing solution, there is protein that
can pollute the electrode film.
Soak the electrode in Pepsin/HCL solution for
several hours, such as METTLER-TOLEDO
9891 electrode cleaning solution.
Sulfide pollution
(electrode film becomes black)
Soak the electrode in Thiourea/HCL solution
until the electrode film turns white, such as
METTLER-TOLEDO 9891 electrode cleaning
solution.
Pollution by grease or organic substance.
Use acetone or ethanol to clean the electrode
temporarily for a few seconds.
Common pollution
Use 0.1moL/1NaOH or 0.1mol/1HCL to clean
the electrode for a few minutes.
After using the above methods to clean the electrode, please wash it cleanly with fresh water,
and soak the electrode in 3MKCL solution for about 15 minutes. After that, make calibration
for electrode again.
During the electrode cleaning process, please do not rub the electrode glass sensor or clean
the electrode with mechanical way; otherwise, there will be statics that influence the electrode
reaction.
For the cleaning of platinum electrode, wipe the platinum ring with watered cloth.
※ The electrode cleaning cycle depends on the pollution degree of the
water sample. Generally speaking, weekly cleaning and calibration is
suggested, or clean it according to the electrode operation manual or as
suggested by the original factory.
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