Ion concentration pH/Cond 3320
38 ba77054e03 03/2018
7 Ion concentration
7.1 Measuring
7.1.1 Measuring the ion concentration
NOTE
When connecting an grounded PC/printer, measurements cannot be
performed in grounded media as the values would be incorrect.
The USB interface is not galvanically isolated.
Stability control
(AutoRead )
The stability control function (AutoRead) continually checks the stability of the
measurement signal. The stability has a considerable impact on the reproduc-
ibility of measured values (see section 9.2.3 A
UTOMATIC STABILITY CONTROL,
Incorrect calibration of ion sensitive electrodes will result in incor-
rect measured values. Calibrate regularly before measuring.
For precise ISE measurements the temperature difference
between measurement and calibration should not be greater that
2 K. Therefore, adjust the temperature of the standard and
measuring solutions accordingly. If the temperature difference is
greater the [TempErr] warning appears in the measured value
display.
1. Connect the ISE electrode to the meter.
The pH/U/ISE measuring window is displayed.
2. If necessary, select the ISE display (unit, mg/l) with <M>.
3. When measuring without temperature sensor:
– Temper the test sample, or measure the current temperature.
4. Calibrate or check the meter with the electrode.
While no valid calibration is available, e.g. in the delivery condition,
"Error" appears in the measured value display.
5. Immerse the electrode in the test sample.
ISE
0.157mg/l
25.0
°C
Ag
15.02.2014
12:12
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