Calibration With Any Buffers - JUMO 202710/20 Operating Manual

6 Calibration of the pH combination electrode
Rinsing
Calibration point 3

6.3.2 Calibration with any buffers

Calibration point 1
The device detects the selected buffer solution automatically and saves the
measured pH value as calibration point 2 as soon as it is stable.
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.
rH mV mV pH
H
ATC ok CAL AL Logg pH
Rinse the combination electrode and the temperature probe with de-ion-
ized (distilled) water and dry.
Insert the combination electrode and the temperature probe into the third
buffer solution and gently stir.
The device detects the buffer solution automatically and saves the measured
pH value as calibration point 3 as soon as it is stable.
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!
For a sufficiently accurate reading of the slope, the pH values of the selected
buffer solutions should not be too close together (minimum gap of 2 pH from
the neutral buffer).
Press the key for at least 2 seconds to start the calibration.
Use the and
Insert the combination electrode and the temperature probe into the first
(neutral) 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.
If the 1 point calibration has been selected as the calibration method, any
buffer solution with a known pH value can be employed.
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.
keys to set the value for the neutral buffer solution.
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