wtw inoLab 740, Operating Manual

Page: 104 / 274

Ion concentration
104
Calibration Use two or three different standard solutions. For the three-
point calibration, the standard solutions have to be selected
in either increasing or decreasing order.
Note
The measurement precision is also dependent on the
selected standard solutions. Therefore, the selected
standard solutions should cover the expected value range of
the subsequent concentration measurement.
Standard
solution 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