Ion concentration
112
7.4 Measuring the ion concentration
Preparatory
activities
Perform the following preparatory activities when you want
to measure the concentration using ion-sensitive
electrodes:
Note
Incorrect calibration of ion-sensitive electrodes will result in
incorrect measured values. Calibrate regularly before
measuring.
Temperature probe The temperature measurement is absolutely essential for a
reproducible measurement. You can perform concentration
measurements using an NTC30 or Pt1000 external
temperature probe using the integrated temperature probe
of another probe, or without a temperature probe. The
temperature probe that is used is indicated on the display by
v, y, or z.
Note
The measuring system automatically recognizes the type of
the temperature probe used. If the measurement is made
without a temperature probe, proceed as follows:
1 Connect the electrode to the measuring module.
2 Adjust the temperature of the solutions, or measure
the temperature if the measurement is made without
a temperature probe.
3 Select the ISE measuring mode.
4 Calibrate or check the measuring system using the
ion-sensitive electrode.
1 Measure the current temperature of the test sample.
2 Adjust the temperature of the test sample and the
calibration standards to the same temperature
(maximum deviation: ± 2 °C).
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