wtw inoLab Oxi Level 2, Operating Manual, Page: 35 / 82

Operation
119
Preparatory
activities
Perform the following preparatory activities:
Note
For calibration, use tempered standard solutions with a tem-
perature that differs by maximum
±
2 °C from the tempera-
ture of the test sample.
Calibration Use two or three different standard solutions out of the fol-
lowing range. For the three point calibration, the standards
must be selected in increasing or decreasing order.
Note
The measuring accuracy depends on the standard solutions
selected and on the expected concentration of the ISE mea-
surement following.
1 Switch on the instrument by pressing
e
.
2 Connect the electrode to the instrument.
3 Connect a temperature probe to the instrument in
order to notice whether there are temperature diffe-
rences too high while calibrating.
4 Keep the standard solutions ready.
5 Adjust the temperature of the solutions.
Parameter Values [mg/l]
Std 1 0.01; 0.02; 0.05; 0.1; 0.2; 0.5; 1; 2; 5; 10; 20;
50; 100; 200; 500; 1000
If Std 2
>
Std 1, Std 3 must be
>
Std 2
If Std 2
<
Std 1, Std 3 must be
<
Std 2
Std 2
Std 3