SmartController
7000
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Care and cleaning of
the electrode
The accuracy of the pH or mV measurement depends on the
cleaning condition of the electrode. For this reason, it should
be treated with special care.
Never stick the electrode into the sand to test the pH or
mV value in the ground. The sensitive glass sphere could
be destroyed as a result, whereas the damage would be
irreparable and the warranty would become void. (1).
During the operation, the electrode should be half immersed
in water. Cable and screw connections must not come into
contact with water.
The cable of the electrode should not be pinched or
mechanically stressed.
A strong algae growth on the electrode will falsify the measured
value. Please mount in position which is as dark as possible.
A dirty or algae-covered electrode may not be cleaned
mechanically: the delicate glass membrane would be
destroyed (2).
Cleaning in intervals of 1 - 3 months
The electrode should be cleaned to avoid faulty measurements.
Please clean using the TUNZE
®
cleaning solution 7040.200 in
intervals of 1 to 3 months.
Let the electrode soak in the cleaning solution for about 10
minutes (3).
Then rinse with very clean water (aqua dest.) and dry with very
soft paper (4).
Service life of the electrode
If a clean electrode is properly stored, the self discharge
(consumption) is lower than when it is used in measuring
media. Therefore, the electrode tip should always be kept
moist between the measurements, and preferably stored in a
KCl solution. The electrode has a salt reservoir made of KCl (5)
on the inside. This salt reservoir will be gradually consumed. If
it is exhausted, there could be severe incorrect measurements
and the electrode must be replaced.
If the electrode is exposed to the open for several hours, the
membrane at the tip can dry out, resulting in a defect of the
electrode.
The service life of the electrodes during continuous operation
is approx. one to two years, whereas this time can usually be
extended with good care and occasional measurements. A
storage time of the mV or pH electrode for several months
before first use only slightly shortens the service life, if the tip
of the electrode remains in the protective cap with KCl solution
and is kept moist. Exact specifications are thereby not possible
here, because the lifetime depends on the respective usage.
The date of manufacture of the electrode is located on the
outer side of the electrode packaging.
