Ion concentration
Multi 3320
38
ba77053e04
07/2018
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 10.2.3 A
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
0.157
mg/l
25.0
°C
Ag
15.02.2014
12:12
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