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An online dissolved oxygen (DO) analyzer is a device used to continuously monitor and measure the concentration of dissolved oxygen in water or wastewater. These analyzers are typically employed in industries like water treatment, aquaculture, environmental monitoring, and chemical processing. They provide real-time data that is critical for maintaining water quality, ensuring efficient processes, and meeting regulatory standards.

The analyzer supports continuous process monitoring through a digital display, configurable measurement ranges, temperature compensation, calibration functions, and programmable alarm thresholds. Depending on the selected configuration, the system can provide concentration measurements in mg/L or ppm, percentage saturation, 4–20 mA analog output, relay contacts, and RS-485/Modbus communication for integration with PLC, SCADA, and DCS automation systems. Advanced optical sensor configurations can offer reduced maintenance requirements by eliminating the need for a continuously applied polarization voltage and reducing routine membrane and electrolyte servicing.

Designed for reliable online monitoring in industrial and environmental applications, the analyzer is suitable for effluent treatment plants (ETP), sewage treatment plants (STP), biological wastewater treatment, activated sludge processes, aquaculture, fish farming, surface water monitoring, and industrial process water systems. Continuous dissolved oxygen measurement helps operators optimize aeration control, improve biological treatment efficiency, reduce unnecessary energy consumption, and maintain the required oxygen concentration for process stability.