Product Introduction

The KH.SZ-RDO Optical Dissolved Oxygen (RDO) Sensor is a high-precision water quality monitoring instrument based on the principle of fluorescence quenching. When excitation light strikes the sensor’s fluorescent surface, the emitted fluorescence is quenched proportionally to the dissolved oxygen concentration. The sensor measures the phase difference between fluorescence and excitation light and calculates the oxygen level using an internal calibration curve, with automatic temperature and salinity compensation. Designed for submersible applications, the KH.SZ-RDO provides stable, fast, and accurate dissolved oxygen measurements in environmental, industrial, and aquaculture monitoring systems. It supports RS-485 Modbus RTU output for easy integration with PLC, DCS, SCADA, or other industrial platforms.

Key Features

• Fluorescence quenching measurement: Accurate and reliable oxygen detection without chemical reagents.
• Wide measurement range: 0–20 mg/L or 0–200%, adjustable for different monitoring needs.
• High precision and repeatability: Accuracy ±0.3 mg/L, repeatability ≤0.3 mg/L.
• Fast response: T90 <60 seconds.
• Long-term drift stability: Zero drift ±0.3 mg/L, range ±0.3 mg/L.
• Temperature and salinity compensation: Automatic adjustment ensures accurate measurements under varying conditions.
• Durable and waterproof: IP68-rated housing, submersible up to 60 meters.
• Easy integration: RS-485 Modbus RTU output compatible with industrial monitoring systems.
• Low maintenance: Fluorescence-based measurement avoids electrode fouling and calibration drift.

Application Scenarios

• Environmental water quality monitoring in rivers, lakes, and reservoirs
• Wastewater treatment plants and industrial effluent monitoring
• Aquaculture and fish farming dissolved oxygen management
• Laboratory, tanks, and pipeline oxygen monitoring
• Chemical, pharmaceutical, and food processing applications

Technical Specifications