Digital Dissolved Oxygen Sensor | Fluorescence DO Probe with 4–20 mA & RS485

This fluorescence-based dissolved oxygen sensor delivers stable, high-accuracy DO measurements without the drawbacks of traditional electrochemical probes. Using optical quenching principles, the sensor determines oxygen concentration by measuring the phase shift between excitation light and emitted fluorescence, with automatic temperature and salinity compensation applied to the final reading.

The solid-state optical design eliminates electrolyte consumption and membrane replacement, providing fast response, long service life, and minimal maintenance. Multiple industrial outputs—RS485 digital and 4–20 mA analog—allow straightforward integration with PLCs, RTUs, SCADA systems, data loggers, and IoT platforms.

With a waterproof, corrosion-resistant construction and configurable housing materials, the sensor is suitable for continuous immersion in fresh or salt water across demanding environments.

Key Applications

• Aquaculture and fish farming

• Rivers, lakes, and environmental monitoring

• Wastewater and water treatment plants

• Industrial process water monitoring

• Reservoirs and surface water assessment

• Smart water and IoT water quality systems

Compliance & Design Considerations

• Optical fluorescence DO measurement (no electrolyte, no stirring requirement)

• Supports RS485 digital communications and 4–20 mA current loop

• Suitable for ISO-aligned water quality monitoring programs

• Waterproof, corrosion-resistant construction

• Environmentally safe design with no hazardous chemicals