Xylem ProLab 4000 MULTIPARAMETER BENCHTOP METER - Manual (Page 122)

Ion concentration ProLab 4000
122 ba75646e02 01/2010
9.6.5 Sample addition
In the Sample addition procedure, a known amount of test sample is
added to the standard solution.
The ion concentration in the sample is calculated from the change in
potential.
Calibration
Measuring
1 Check the currently displayed ion.
If the ion to be measured is displayed incorrectly:
Select the ion type in the menu, Measuring / ISE methods / Ion
type.
2 In the Measuring / ISE methods menu, select the method,
Sample addition.
3 Carry out a two-point calibration according to the user guid-
ance (see page 106).
As soon as a stable value is achieved for the second standard
calibration solution, the slope (mV) and evaluation (Error, +++)
of the electrode after calibration is displayed.
The infotext, Accept calibration and terminate is displayed.
4 Using [OK], confirm the infotext Accept calibration and termi-
nate.
The calibration record is displayed and output to the interface.
The calibration procedure is finished.
5 Close the calibration record with [OK].
The ISE method: The Sample addition window pops up. The
Standard register is displayed.