Metrohm 781 pH/Ion Meter - Manual (Page 69)

6 Methods / Parameters
780/781 pH/Ion Meter, Manual
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report: OFF, short, full
After the calibration it is possible to output the calibration data automat-
ically in the form of a report. You should chose between the 'short' ver-
sion which contains all the relevant data and the 'full' version which ad-
ditionally shows the calibration curves in the form of a graph (see Sec-
tion 7.2.4).
Such a report can also be exported at a later date with the calibration
data of each stored electrode Id.
cal. interval OFF, 1...999 h
The pH/Ion Meter can automatically remind you about any recalibration
of the pH electrode which is due. This means that if a calibration is car-
ried out with a preset calibration interval then, when this interval has
elapsed, a message will appear on the display:
cal.interval expired
This message remains and will be printed out on every measuring point
report until a new calibration has been carried out.
no. of buffers 1, 2...9
Up to 9 buffers can be used for the pH calibration. If calibration is car-
ried out with only one buffer then the program will use the theoretical
value of 100.0% for the slope. This also applies when a calibration with
several buffers is canceled with or after the first
buffer has been measured and then confirmed with .
If three or more buffers are used then the variance will be included in
the calibration data. More detailed information about the evaluation is
given in Section 9.2.
buffer type: Metrohm, NIST, DIN, Fisher,
Fluka-BS, Mettler, Merck Tit.,
Merck Cer., Beckman, Radiometer,
Baker, Hamilton, Precisa, special,
own, mixed
For the automatic temperature-specific buffer recognition during the
calibration and for the electrode test, information about the type of buff-
er used is required. In the pH/Ion Meter the temperature-dependent pH
values of reference buffer solutions and technical buffer solutions from
some suppliers are stored. Such a buffer table for Metrohm buffers
looks like this: