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Sensors For Liquid Analysis

Prominent Gmbh

  • Redox sensor (ORP)
  • Redox sensor (ORP)

Article: 00123297

Redox sensor (ORP)

The Redox potential quantifies the existence of oxidants or reducing agents in a medium. The measurement of this parameter is relatively cost-efficient, however, it has also some disadvantages: No selective determination of a defined oxidant or reducing agent, strong pH dependence, the measuring signal takes a saturation curve with increasing concentration.

The Redox potential is an unspecific sum parameter that does not permit selective determination of a defined oxidant or reducing agent at simultaneous presence of further redox active reagents. Moreover, the measuring signal is strongly pH dependent and takes a saturation curve with increasing concentration. However, the Redox measurement can be used as a cost-efficient alternative to selective direct determination of oxidants and reducing agents (e.g. via amperometric probes) or as a redundant measuring additionally to selective direct determination. For this purpose, the following conditions must be observed:

The connection to be analyzed is potential determinating and there are no further redox active connections
The pH value of the process fluid remains constant
The concentration to be expected is located in the steep section of the saturation curve

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