Oxygen Sensors & Transmitters

Oxygen Sensors & Transmitters

Oxygen sensors and transmitters measure dissolved oxygen (DO) to support quality assurance and process control across a wide range of aqueous applications. DO is a primary control variable in biological treatment and fermentation and a critical indicator in processes where oxidation, inerting, or oxygen-sensitive reactions must be tightly managed.

Two core measurement technologies are common. Amperometric sensors use electrodes and a membrane to convert oxygen transport into an electrical current proportional to oxygen partial pressure; they provide accurate, linear measurement from trace levels to higher concentrations but require periodic maintenance. Optical sensors use fluorescence quenching: oxygen attenuates emitted fluorescence from marker molecules, enabling stable measurement with very low routine maintenance and fast availability of steady readings.

Continuous DO measurement supports energy optimization in aeration systems, stabilizes biological treatment performance, and improves product consistency in fermentation. It also supports safer operation in applications requiring oxygen control from trace detection up to high concentrations, including duties involving hygienic or hazardous environments.

Typical applications include aeration control in wastewater treatment plants, environmental monitoring, and fish farming. Fermentation and bioprocessing benefit from responsive DO control to maintain metabolic conditions, while chemical and life sciences operations use DO monitoring to support inertization strategies and oxygen-sensitive steps.

Engineering considerations include selecting the sensing principle based on maintenance philosophy and process dynamics, ensuring proper installation for representative mass transfer conditions, and planning cleaning strategies for fouling-prone services. Transmitters commonly provide multiple display formats (concentration, partial pressure, or percent saturation) to align the signal with control objectives.

Engineered Equipment Company, a leading supplier of specialized industrial equipment.