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Manual PRO50-150 V.2
regenerate the probe by cleaning it. In any event, annual cleaning is always
advisable.
-
Stir the probe in a glass of water, in which a spoonful of dishwashing
detergent has been mixed. Rinse well in clean water.
-
Mix a commercial brand of hydrochloric acid at 23% in a glass, with
four times its volume of water. Leave the probe in the solution for a few
minutes, stirring from time to time.
-
Thoroughly clean the probe in pure, preferably distilled water. Shake
the probe to remove the water.
Recheck the value of the probe. A probe that gives an error lower than around
30 mV can continue to be used provisionally while it is replaced.
Never leave the probe outside. If the probe has been dry for a time, it can be
regenerated with the hydrochloric acid solution.
5.3- Checking and maintenance of the pH probe
It is recommended to clean and check the probe at least once a year. Stir it in a
glass of water in which a spoonful of detergent has been dissolved. Then wash
3
it under the tap and leave it for a few hours in a glass of water in which 1 cm
of hydrochloric acid has been added.
Recalibrate the probe again.
If well maintained, a probe can last for two or three years.
The probe should never be left to dry. If it is kept outside the installation, the
original cap should be placed, or it should be submerged in a glass of water. If
a probe has been left to dry, it can be regenerated by leaving it for 12 hours in
a glass of water, preferably adding a few drops of hydrochloric acid.
5.4- Checking and maintenance of the Amperometric probe
(PRO/2 kit)
Please, read carefully the 3.5.2 section of this manual.
To locate any possible problems, you can follow the recommendations in the
following table:
PROBLEMS
CAUSE
SOLUTION
Reading = 0, does not
coincide with the DPD-
1 measurement
Failure in the connection of
the sensor with the controller
Check connections
