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Oxidation-Reduction Potential (ORP) or Redox potential
measurements are used to monitor chemical reactions, to
quantify ion activity, or to determine the oxidizing or
reducing properties of a solution. ORP is a measurement of
the electrical potential of a redox reaction and serves as a
yardstick to judge how much oxidation or reduction takes
place under existing conditions.
ORP electrodes
measure the voltage across a circuit formed by the measuring
metal half cell and the reference half cell. When the ORP
electrode is placed in the presence of oxidizing or reducing
agents, electrons are constantly transferred back and forth
on its measuring surface, generating a tiny voltage. The ORP
measurement can be made using the millivolt mode of a pH
meter.
Major areas of
usage include the treatment of industrial wastes, study of
biological systems, oxidation of cyanide, bleaching of pulp,
manufacture of bleach and reduction of chromate wastes. The
measurement of ORP is also useful in pool water treatment as
an indication of sanitation in relation to free chlorine
parameter.
Eutech offers a
wide range of ORP meters that measure both pH and ORP values
in various educational, laboratory and industrial
applications. These include ORPTestr™10 pocket tester,
portable
meters CyberScan Series pH 300, pH 310, pH 11 and pH 110,
EcoScan pH 6 and the CyberScan
bench meter series 510, 1100, 2100, 1500 and the colour
touchscreen research-grade series 6000.
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Special
Instrument
ORP/REDOX
