Description Of Probes; Ph Electrodes - Testo 252 Bedienungsanleitung

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Description of probes

Watch out for the measuring ranges in
the sensor. These may be
destroyed if overheated.
To avoid grinding never use pH
electrodes or conductivity measuring
cells with surface temperature probes.
As
practical equipment for pH measurements, we
offer a variety of electrodes which are suitable for
all types of measurements.
There is a choice of combination electrodes with or
without a temperature sensor as well as redox
electrodes.
pH combination electrodes
Combination electrodes represent a constructive
combination of a glass electrode with a reference
electrode. The advantage of this solution is the
small amount of space and the small volume of
measuring liquid required for a measurement.
The important features of pH combination
electrodes:
- the composition of the membrane glass
(which influences the measuring charac-
teristics of the glass electrode),
- the composition of the reference electrode
(mostly KCl),
- the diaphragm, which enables the connection
from the internal reference system to the
measuring solution
- the possibility of an additional temperature
measurement.
The table opposite supplies the necessary
information on the different electrodes.
Special electrodes are available on request
for applications in lacquers and paints, highly-
viscose solutions, photographic solutions,
measurements on pure surfaces, part aqueous
solutions with < 10% H
substances, and for measurements at O ° C (+32
°F).

pH electrodes

O, non aqueous
2