Redoxsensors

Redox sensors, also known as electrochemical sensors, are devices used to measure the oxidation-reduction potential (ORP) of a solution. ORP is a measure of the tendency of a chemical species to acquire electrons and therefore be reduced, or to lose electrons and become oxidized. This potential is expressed in millivolts (mV) and provides an indication of the overall oxidizing or reducing capacity of a liquid.

The core component of most redox sensors is an electrode, typically made of an inert noble metal like platinum or gold. This electrode is immersed in the solution being tested. A reference electrode, which maintains a stable and known potential, is also part of the sensor assembly. The difference in electrical potential between the working electrode and the reference electrode is measured by a voltmeter. This measured potential is the ORP value.

Redox sensors are widely employed in various applications. In water treatment, they are used to monitor the effectiveness of disinfection processes, assess the presence of oxidizing agents like chlorine, and control aeration in wastewater treatment. In swimming pools and spas, they help maintain water quality by ensuring proper sanitization levels. Industrial processes also utilize redox sensors for monitoring chemical reactions, controlling plating baths, and ensuring product quality. Environmental monitoring relies on redox sensors to assess the redox state of natural waters, which can indicate pollution or the presence of anaerobic conditions. The interpretation of ORP values requires understanding the specific chemistry of the system being monitored.