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FCML 412 N(-S), FCML 412-M12
ba77197e02
01/2024
5
Maintenance, cleaning, storage
5.1
Cleaning the measurement electrode / exchanging the mem-
brane cap and electrolyte
We recommend to disconnect the sensor from the measuring transmitter
before starting any maintenance work.
If calibration is not possible due to readings that are too low, the measure-
ment electrode has to be cleaned with the enclosed polishing strip. Proceed
as follows:
1.
Using a blunt object, lift the hose ring out of the guiding groove and
push it to the side so that the valve opening is uncovered.
NOTE
Negative pressure in the membrane cap can destroy the membrane
disk. Therefore, make sure the valve opening is not inadvertently
closed by your fingers while unscrewing the membrane cap.
2.
Unscrew the membrane cap from the sensor shaft and pour away the
electrolyte solution.
3.
Rinse the electrode finger and membrane cap with clean water and
dab them dry with a clean paper towel.
4.
Clean the measurement electrode with the polishing strip.
To do so, place the polishing strip on a paper towel and hold it by a
corner. Then hold the electrode finger vertically with the tip down and
run the tip over the polishing strip two or three times.
NOTE
The brown coating on the shell (reference electrode) of the electrode
finger must not be polished off. This would destroy the sensor!
Maintenance, cleaning, storage
1 Valve opening
2 Hose ring
1
2
15
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