15
Standardizing for
Millivolt Measurement
(Relative Millivolt)
You will normally use millivolt measurements for
determining ion concentration and for measuring
redox potential (also called ORP, oxidation reduction
potential).
You will use an ion selective electrode (ISE),
combined with a reference electrode, to measure ion
concentration. The ISE senses the ion concentration
and responds with a millivolt potential. The millivolt
readings are then used to determine ion concen-
trations (on the basis of a previously entered
calibration curve).
You will normally use a redox/ORP electrode to
measure redox potential (ORP). ORP measurements
indicate the oxidizing or reducing capability of a
solution. You can use ORP values to monitor or
control solutions requiring a set amount of oxidants
or reductants.
1. Immerse electrode in a standard solution.
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