RS485 Fluorescence Dissolved Oxygen Sensor (Freshwater)

The RS485 Fluorescence Dissolved Oxygen Sensor (Freshwater) provides a high-stability solution for measuring dissolved oxygen, designed specifically for freshwater environments. It operates on the principle of fluorescence quenching, an optical method that measures the phase shift of light caused by oxygen molecules. This optical DO probe delivers a high-accuracy measurement range of 0-20 mg/L (0-200% saturation) with an error of just ±3% FS. Key advantages include its maintenance-free optical design, built-in automatic temperature compensation, and simple system integration via the standard ModBus-RTU protocol. With a robust IP68 waterproof rating, this water quality instrument is engineered for demanding applications in freshwater aquaculture, wastewater treatment, and long-term environmental monitoring.

Maintenance-Free Fluorescence Principle

Traditional electrochemical sensors require frequent calibration and electrolyte replacement due to electrode polarization and depletion. This fluorescence dissolved oxygen sensor utilizes an advanced optical method that does not consume oxygen or rely on electrolytes. This design results in excellent long-term stability, significantly reduces maintenance frequency, and lowers the total cost of ownership.

Accurate Data with Automatic Temperature Compensation

Dissolved oxygen levels are highly dependent on water temperature. This ModBus DO sensor integrates a dedicated temperature sensor to monitor water conditions in real time. It automatically applies temperature compensation to every measurement, ensuring accurate and reliable dissolved oxygen concentration and saturation readings, even in environments with fluctuating temperatures.

Seamless System Integration via RS485

The industrial-grade sensor is equipped with an RS485 communication interface and supports the standard ModBus-RTU protocol. This feature allows for reliable, long-distance data transmission and simple integration into existing data platforms, PLCs, data loggers, or other industrial control and monitoring systems. The unit comes factory-calibrated and also supports user-defined zero-oxygen and full-scale calibration via registers for optimization.

Robust Design for Harsh Environments

Engineered for long-term field deployment, the dissolved oxygen sensor is built to last. The probe is constructed from 316 stainless steel, offering superior resistance to corrosion. The entire unit is sealed to an IP68 waterproof rating, ensuring it can be continuously submerged and operate reliably in challenging freshwater conditions, including rivers, lakes, and treatment facilities.