JUMO 202710, Operating Manual

Page: 22 / 58

6 Calibration of the pH combination electrode
22
6.3 Calibration with temperature probe
6.3.1 Calibration with standard buffer series, example using technical
buffer series
Calibration point 1
✱
Press the key for at least 2 seconds to start the calibration.
✱
Insert the combination electrode and the temperature probe into the first
buffer solution and gently stir.
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 and the temperature probe with de-ion-
ized (distilled) water and dry.
Calibration point 2
✱
Insert the combination electrode and the temperature probe into the sec-
ond buffer solution and gently stir.
NOTE!
If the 2 or 3 point calibration has been selected as the calibration method,
the device expects a neutral buffer solution within the range pH 6.5 to pH 7.5
for the first calibration point.
The device automatically detects the buffer solutions of the technical buffer
series and the DIN buffer series.
If the 1 point calibration has been selected as the calibration method, any
buffer solution can be employed (so, for example, also pH 4 or pH 10 when
selecting a technical buffer series).
The value "7.0" appears on the main display of the
device, "Pt.1" and a revolving symbol appear on the
subsidiary display of the device.
If the measured pH value is outside of the acceptable
range, the value "7.0" flashes.
If the measured pH value is within the acceptable
range and is stable, the device saves the value auto-
matically as calibration point 1.
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
rH mV mV
H
pH
ATC ok AL Logg pH CAL
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