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6 Calibration of the pH combination electrode
6.6
Displaying specifications of the combination electrode
Displaying asymmetry
Displaying slope at 25 °C
30
less than 30 %: The combination electrode is severely aged or contami-
nated.
If there is no improvement after cleaning (see chapter 11.2
"Cleaning", page 50) and subsequent calibration, the com-
bination electrode must be replaced.
NOTE!
During the evaluation, both the asymmetry and the slope of the combination
electrode are considered.
Press the
key twice in an interval of approx. 1 second.
rH
mV
mV
pH
H
ATC
ok
CAL
AL Logg
pH
Admissible range:
Optimal:
NOTE!
Contamination can cause the asymmetry of the combination electrode to
deteriorate significantly.
Briefly press the
rH
mV
mV
pH
H
ATC
ok
CAL
AL Logg
pH
Admissible range:
Optimal:
The asymmetry of the pH combination electrode is
displayed for approximately 3 seconds.
Example: asymmetry -30 mV
±55 mV
0 mV
key three times in an interval of approx. 1 second.
The slope of the pH combination electrode is dis-
played for approximately 3 seconds.
Example: slope -52.9 mV/pH
-62 to -45 mV/pH
-59.2 mV/pH
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