Storage SenTix®
6ba75739e03 11/2016
Subsequent cali-
brations
The frequency of subsequent calibrations depends on the application. Many
meters provide an option where you can enter a calibration interval. After the
calibration interval has expired, the meter will automatically remind you of the
due calibration.
Storage
During short
measuring breaks
With the refilling opening open, immerse the electrode in reference
electrolyte (KCl 3 mol/L, Ag+free). Observe the minimum depth of
immersion. Prior to the next measurement, shortly rinse the electrode with
the test sample or deionized water.
Overnight or
longer
Put the clean electrode in the watering cap that is filled with reference
electrolyte (KCl 3 mol/L, Ag+free) and close the refilling opening.
NOTE
pH electrodes must not be stored dry or in deionized water. The elec-
trode could be permanently damaged by this. If the liquid in the
watering cap has dried up, condition the electrode in reference electro-
lyte (KCl 3 mol/L, Ag+ + free) for at least 24 hours.
Aging
Please note that pH electrodes are consumables. Every pH electrode under-
goes a natural aging process. With aging, the responding behavior becomes
slower and slower and the electrode slope and asymmetry change. More-
over, extreme operating conditions can considerably shorten the lifetime of
the electrode. These are:
Strong acids or lyes, hydrofluoric acid, organic solvents, oils, fats, bro-
mides, sulfides, iodides, proteins
High temperatures
High changes in pH and temperature.
The warranty does not cover failure caused by measuring conditions and
mechanical damage.
Prevent contact of the pH membrane to the beaker bottom to
avoid scratches on the pH membrane.
During longer storing periods, salt sediments may develop on the
watering cap. They do not affect the measuring characteristics
and can easily be removed with deionized water when the elec-
trode is put into operation again.
