1 Introduction
780/781 pH/Ion Meter, Manual
1
1 Introduction
This Manual provides you with a comprehensive overview of the instal-
lation, working principles and operation of the
and
. As these two instruments are identical as far as the three
measuring modes of the 780 pH Meter are concerned (pH, temperature
and potential) and their operation in these modes is also identical, the
Manuals for both have been incorporated in a single document. The
special measuring mode of the 781 pH/Ion Meter – the measurement of
concentration – is, like the other measuring modes, described in sepa-
rate sections. These sections, which apply only to the operation of the
781 pH/Ion Meter, are marked accordingly.
Information about the use of Metrohm pH or ion-selective electrodes
can be found in the appropriate leaflet and the ISE Manual that is in-
cluded with the electrode.
Additional theoretical principles can be found in the Metrohm Mono-
graph "
Electrodes in Potentiometry
".
You can also request our descriptions of applications involving pH and
ISE measurements in the form of
and
from your local Metrohm agency or download them from the
Internet under
www.metrohm.com.
Fig. 1: 781 pH/Ion Meter connected to 801Magnetic Stirrer
1.1 Instrument description
Both instrument versions, the
and the
are used for measuring pH, temperature and potential reliably and at
high resolution. The
differs from the
by
having an additional operating mode for the potentiometric determina-
tion of the concentration by using ion-selective electrodes (
).
Both instruments have comprehensive monitoring functions (for calibra-
tion, validation and service intervals), diagnostic functions and an au-
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