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4 Calibrating a pH combination electrode
4.5
Display of the electrode state
The state of the pH combination electrode will be displayed for approx. 3
seconds after every calibration.
The evaluation takes into account both the asymmetry and the slope of the
combination electrode.
4.6
Parameters in the combination electrode display
Show
asymmetry
Contamination can seriously worsen the asymmetry of the combination
electrode.
20
CAL
Briefly press the
2
3
The state of the pH combination electrode will be displayed for approx. 3
seconds.
rH
mV
mV
pH
H
mbar
ATC
ok
CAL
AL Logg
pH
100%
The combination electrode is in very good condition
90 — 30%
The state of the combination electrode is satisfactory
less than
The combination electrode is severely aged or contaminated.
30%
If there is no improvement after cleaning (see Chapter 7.2
"Cleaning", page 27) and a subsequent calibration, then the
combination electrode must be replaced.
CAL
Briefly press the
3
2
rH
mV
mV
pH
H
mbar
ATC
ok
CAL
AL Logg
pH
Permissible
±60 mV
range
Optimum
0 mV
key.
key.
Asymmetry -30 mV
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