A single voltage is called the Oxidation-Reduction Potential, where a positive voltage shows a solution attracting electrons (oxidizing agent). For instance, chlorinated water will show a positive ORP value whereas sodium sulfite (a reducing agent) loses electrons and will show a negative ORP value.
ORP is measured in millivolts (mV), with no correction for solution temperature. Like pH, it is not a measurement of concentration directly, but of activity level. In a solution of only one active component, ORP indicates concentration. As with pH, a very dilute solution will take time to accumulate a measurable charge.
An ORP sensor uses a small platinum surface to accumulate charge without reacting chemically. That charge is measured relative to the solution, so the solution
ground voltage comes from the reference junction, the same type used by a pH sensor.
Practically, ORP as a measurement performed on a pH meter with a mV mode with an ORP electrode
This high technology device is connect ready for applications in harsh environments like mining and resource recovery industries, remediation and aquifer redraw applications as examples only of the capability.
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