108
APT4000PH
Asymmetry
potential
Glossary
The voltage which a pH electrode provides
at a pH of 7. The asymmetry potential is
different for each electrode and changes
with age and wear.
Calimatic
Automatic buffer recognition. Before the
first calibration, the buffer set used must
be activated once. The patented Calimatic
then automatically recognizes the buffer
solutions used during calibration.
Combination
electrode
Combination of glass and reference elec-
trode in one body.
Calibration
Adjustment of the pH meter to the current
electrode characteristics. The asymmetry
potential and slope are adjusted.
You can conduct either a one or a two-
point calibration. With one-point calibra-
tion only the asymmetry potential (zero
point) is adjusted.
Buffer solu-
tion
Solution with an exactly defined pH value
for calibrating a pH meter.
Buffer set
Contains selected buffer solutions which
can be used for automatic calibration with
the Calimatic. The buffer set must be
selected prior to the first calibration.
109
DURAFET
DURAFET combination pH/ORP electrodes
consist of an ISFET measuring electrode, a
reference electrode, and a temperature
probe.
DURAFET
cap adapter
Adapter integrated in the protective cap of
the DURAFET electrode. Here, the signal of
the pH-sensitive FET is converted to volt-
age corresponding to the signal of a glass
electrode. This voltage is led to the pH
input of the analyzer and is processed fur-
ther as usual. The adapter is directly sup-
plied from the analyzer.
GainCheck
Device self-test which runs automatically in
the background at fixed intervals. The
memory and measured-value transmission
are checked. You can also start the
GainCheck manually. Then a display test is
also conducted and the software version
displayed.
Electrode
zero point
See asymmetry potential
Electrode
slope
Is indicated in % of the theoretical slope
(59.2 mV/pH at 25 °C). The electrode
slope is different for every electrode and
changes with age and wear.
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