Bases for measurement | 5
B-H86.0.12.DB2-1.0
15 / 35
5.2 Redox measurement
5.2.1 Explanation
The Redox potential
0RP
specifies the extent to which the measured sample has an
oxidising or reducing effect relative to the standard hydrogen electrode.
This potential is frequently used in swimming pools as a measured variable for the dis-
infecting effect of a chlorination. For aquaria, the Redox value is also an important
parameter, because fish can only live within a specific Redox range. The measure-
ment is also important in drinking water preparation, waste water monitoring and in in-
dustrial applications.
Measurement takes place relative to the widespread silver/silver-chloride system with
3 mol/l KCL electrolyte. The measurements can be read directly (mV setting) or auto-
matically with the mV
H
unit setting and temperature compensation is calculated based
on the standard hydrogen electrode reference system.
Calibration comparable to the pH measurement does not take place for the Redox
measurement. However, the suitability of the electrodes can always be checked with
Redox testing solutions, such as GRP 100.
