multi EA 5100
Maintenance and care
151
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Do not touch the measuring cell and the electrode during operation (during a mea-
surement or an end point routine). The measurement result will be falsified other-
wise.
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The generator anode is located at the bottom of the measuring cell in the form of
the stable silver plate (silver circle). The silver electrode wears out with increasing
use. If necessary, the entire measuring cell must be replaced.
Sensor electrode
NOTICE
Risk of damage to the sensor electrode
The sensor pin and the gold contact of the sensor electrodes are sensitive to touch.
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Apply scratch protection to the sensor pin for storage.
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Rinse the sensor pin with ultrapure water before use or to clean it. Do not touch it
again after this. Do not dry the pin or wipe it dry!
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Before use or to clean it, wipe the gold contact with a cloth and some ethanol. Do
not touch it again after this.
Storing the sensor electrode:
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The sensor electrode can be stored in the measuring cell for several days if it is suffi-
ciently filled with electrolyte solution.
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Clean the sensor electrode with ultrapure water before longer storage. Apply scratch
protection to the sensor pin. Store the electrode in a dry place.
Reference electrode
CAUTION
Risk of injury
A risk of injury due to broken glass is present when handling glass parts.
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Handle glass parts with extreme caution.
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Check the condition and filling level of the bridge electrolyte weekly. The bridge
electrolyte must be clear and free of deposits or other particles.
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If necessary: Refill or replace the electrolyte solution.
Storing the reference electrode:
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The reference electrode can be stored in the measuring cell for several days if it is
sufficiently filled with electrolyte solution.
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For storage of less than 1 month: Close the refill opening. Apply the empty protec-
tive cap to the electrode.
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For storage longer than 1 month: Empty the bridge electrolyte completely via the re-
fill opening with a syringe or disposable pipette. Close the refill opening. Apply the
empty protective cap to the electrode.
Putting the reference electrode back into operation after longer storage:
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Rinse the inside of the electrode with approx. 2 ml electrolyte solution.
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Fill the electrode with electrolyte solution up to the refill opening.
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Fill the measuring cell with electrolyte solution. Insert the electrode in the measur-
ing cell and allow the solution to stir for several hours in the detection module. Do
not connect the electrode to its electrical connection for this.
