Ion concentration
pH/ION 3310
40
ba77052d01
03/2014
7.2
Calibration
7.2.1
Why calibrate?
Ion-selective electrodes age and are temperature-dependent. This changes
the slope. As a result, an inexact measured value is displayed. Calibration
determines the calibration line of the electrode and stores this value in the
meter.
Thus, you should calibrate before each measurement and at regular intervals.
7.2.2
When to calibrate?
Before any measurement if possible
After connecting another ISE electrode
When the sensor symbol flashes, e.g. after a voltage interruption (empty
batteries)
7.2.3
Calibration (ISE Cal)
ISE Cal is the conventional
two-point
to
seven-point calibration procedure
that uses 2 to 7 freely selectable standard solutions. The concentration
expected in the measurement determines the concentration of the calibration
standards.
1.
Connect the ISE combination electrode to the meter.
The pH/U/ISE measuring window is displayed.
2.
Keep the standard solutions ready.
3.
When measuring without temperature sensor:
– Temper the test sample, or measure the current temperature.
– Enter the temperature value with
<
> <
>
.
4.
In the measured value display, select the ISE measuring window with
<
> <
>
and
<M>
.
5.
If necessary, change the unit of the measurement result and calibration
standards in the
ISE setup
/
Unit
menu.
6.
Start the calibration with
<CAL>
.
The calibration display appears.
ISE
0.0
24.8 °C
Ag
0.010
mg/l
1
15.02.2014
12:12
Standard
mV
Содержание WTW pH/ION 3310
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