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6 Calibration of the pH combination electrode
Rinsing
Calibration point 3
6.5
Display of the condition of the pH combination electrode
rH
mV
mV
pH
H
ATC
ok
CAL
AL Logg
pH
Use the
and
Rinse the combination electrode with de-ionized (distilled) water and dry.
Insert the combination electrode and the temperature probe into the third
buffer solution and gently stir.
Press the
key when the measured value is stable (small triangle
appears on the display above the yellow "ok" label).
rH
mV
mV
pH
H
ATC
ok
CAL
AL Logg
pH
Use the
and
solution and then save by pressing the
Finally, the condition of the combination electrode is briefly displayed and then
the 3 point calibration is completed and the device returns to measurement
mode.
NOTE!
After every calibration, the condition of the pH combination electrode is dis-
played for approximately 3 seconds.
Briefly press the
rH
mV
mV
pH
H
ATC
ok
CAL
AL Logg
pH
100 %:
The combination electrode is in very good condition
90 to 30 %:
The condition of the combination electrode is adequate
The value on the main display of the device flashes,
"Pt.3" and a revolving symbol appear in the subsidi-
ary display of the device to indicate that the input of
the pH value for the third buffer solution is expected.
keys to set the value for the third buffer solution.
The display changes so that the temperature value
(t.3) for the third buffer solution can be entered.
keys to set the temperature value for the third buffer
key.
The condition of the pH combination electrode is dis-
played for approximately 3 seconds.
key.
29
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