50
In the event that measurements are performed
with solutions containing sulfides or proteins,
the cleaning of the diaphragm of the refer-
ence electrode must be performed (see page
20, "Cleaning Procedure").
In order to have a correct functioning of the
ORP electrode, immerse it into HI 7020 and
measure the response; the obtained value
should be within 200 and 275 mV.
After this functional test, it is suggested to
wash the electrode thoroughly with water and
proceed to the oxidizing or reducing pre-
treatment before taking measurements.
When not in use, the electrode tip should be
kept moist and far from any type of mechani-
cal stress which might cause damage. For
this reason, the use of the protective cap
supplied with the electrode and filled with
HI 70300 storage solution is advised.
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