Metrohm 781 pH/Ion Meter - Manual (Page 12)

1.1 Instrument description
2
780/781 pH/Ion Meter, Manual
tomatic pH electrode test. Up to 100 values can be stored in the
memory together with the most important additional data; these can be
viewed and outputted as a report. All the parameter settings for a
measuring mode can be permanently stored as a method.
All stored information (measured values, configuration, parameters,
etc.) can be transmitted via the RS 232 interface to a printer or comput-
er for output as a report.
Both instruments have the following features:
•
Dot-matrix display for both the continuous display of the measured
value and for showing the user dialog.
• High-impedance measuring input for pH, redox or ISE sensors, a
connection for a separate reference electrode and an input for tem-
perature sensors (Pt1000 or NTC).
• MSB connection (Metrohm Serial Bus) for a stirrer and for a
Dosimat Plus.
• RS 232 connection for a serial printer or a computer.
• A connection for an external keyboard or a barcode reader.
The 781 pH/Ion Meter has an additional Conc mode which allows the
measurement of the concentration by using ion-selective electrodes, ei-
ther directly after calibration or by standard or sample addition meth-
ods. Such a calibration or standard addition can be carried out either
manually or automatically. In the latter method a standard solution is
added automatically by a Dosimat Plus included in the system. The cal-
ibration concentrations or the standard additions are calculated auto-
matically according to the given conditions and these are added with
great accuracy.