Xylem ProLab 3000 LABORATORY pH METER - Manual (Page 107)

ProLab 3000 Ion concentration
107 ba75645e02 01/2010
Continuing with three-
point to nine-point
calibration
Repeat the steps 9 to 16 in the same way with the third and further stan-
dard solutions as necessary. The new calibration values are displayed
after the last calibration step is finished.
16 Using [OK], confirm the Finish with 2-point calibration infotext
and take over the new calibration values.
The calibration record is displayed and output to the interface.
The calibration procedure is finished.
or
Continue the calibration with [Continue].
or
Cancel the calibration procedure without taking over the cali-
bration values with .
Note
A calibration line is determined for the two-point calibration.
Note
Based on the calibration data, the calibration line is determined in sec-
tions. A straight line of the calibration is determined according to the
Nernst equation between the highest and second highest calibration
standard.
Between the lowest and second lowest calibration standard, a calibra-
tion line is determined according to the Nernst equation modified by
Nikolski. The Nikolski equation reproduces the real course of the char-
acteristic curve of the electrode for the low concentration range.