JUMO 202710, Operating Manual

Page: 26 / 58

6 Calibration of the pH combination electrode
26
With 1 point calibration selected, the condition of the combination electrode
is then briefly displayed and then the 1 point calibration is completed and the
device returns to measurement mode.
Rinsing
✱
Rinse the combination electrode with de-ionized (distilled) water and dry.
Calibration point 2
✱
Insert the combination electrode into the second buffer solution and gently
stir.
The device detects the selected buffer solution automatically and saves the
measured pH value for calibration point 2 as soon as it is stable.
✱
Use the and keys to set the temperature value for the second buffer
solution and then save by pressing the key.
With 2 point calibration selected, the condition of the combination electrode
is then briefly displayed and then the 2 point calibration is completed and the
device returns to measurement mode.
Rinsing
✱
Rinse the combination electrode with de-ionized (distilled) water and dry.
Calibration point 3
✱
Insert the combination electrode into the third buffer solution and gently stir.
The device detects the selected buffer solution automatically and saves the
measured pH value for calibration point 3 as soon as it is stable.
The values "4.0" and "10.0" appear alternately on the
main display of the device, "Pt.2" and a revolving
symbol appear on the subsidiary display of the device
to indicate that a buffer solution with either pH 4 or
pH 10 is expected as the second buffer solution.
rH mV mV
H
pH
ATC ok AL Logg pH CAL
The display changes so that the temperature value
(t.2) for the second buffer solution can be entered.
The value of the third calibration point flashes on the
main display of the device, "Pt.3" and a revolving
symbol appear on the subsidiary display of the
device.
rH mV mV
H
pH
ATC ok AL Logg pH CAL
rH mV mV
H
pH
ATC ok AL Logg pH CAL
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