Calibration With Any Buffers - JUMO 202710 Operating Manual

6 Calibration of the pH combination electrode
ATC
Use the
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.

6.4.2 Calibration with any buffers

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).
Calibration point 1
Press the
Use the
Insert the combination electrode 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.
ATC
Press the
appears on the display above the yellow "ok" label).
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rH mV mV pH
H
The display changes so that the temperature value for
the third buffer solution can be entered.
ok CAL AL Logg pH
and keys to set the temperature value for the third buffer
key for at least 2 seconds to start the calibration.
and keys to set the value for the neutral buffer solution.
rH mV mV pH
H
The set value for the neutral buffer solution is on the
main display of the device, "Pt.1" and a revolving
symbol appear on the subsidiary display of the
device.
ok CAL AL Logg pH
key when the measured value is stable (small triangle
key.
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