Redox, ORP measuring instrument
Eutech Instruments

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.