Xylem CG 853 - Manual (Page 70)

Lists
144
Glossary
AutoRead Monitors the electrode drift and releases the measured val-
ue only after the stability criterion has been reached. In this
way, this procedure ensures the highest degree of precision
and reproducibility.
Calibration The cell constant is determined through calibration. To do
so, the conductivity measuring cell is immersed into a series
of aqueous salt solutions with exactly known electric con-
ductiviy. The relevant conductivity values are determined
using the conductivity measuring instrument.
Cell constant Linear factor describing the geometrical dimensions of a
measuring cell and its electrodes.
l With the value of the cell constant you can roughly de-
scribe the application range of a conductivity measuring
cell.
l The cell constant is determined through calibration in one
or several calibration solutions.
Conductivity The conductivity value is a sum parameter for the ion con-
centration of a test sample.
Control standard
solution
Solution with a known conductivity to determine or check the
conductivity.
Drift control See A UTO R EAD .
Reference
temperature
In order to compare values measured at different tempera-
tures, the values have to be converted to a fixed tempera-
ture. This temperature is 25 °C, or, as an exception, 20 °C.