Product Introduction

The KH.SZ-RDO Optical Dissolved Oxygen Sensor is a high-precision online monitoring instrument based on fluorescence quenching technology, designed for continuous dissolved oxygen (DO) measurement in rivers, lakes, reservoirs, wastewater treatment plants, aquaculture facilities, and industrial process water systems.

Using excitation light interaction with a fluorescent membrane, the sensor measures fluorescence intensity and phase shift changes, which are processed by internal calibration algorithms to calculate accurate dissolved oxygen concentration. With automatic temperature and salinity compensation, the KH.SZ-RDO delivers stable and reliable readings over long-term deployment.

Its IP68-rated submersible design enables continuous immersion up to 60 meters, providing maintenance-free operation without chemical reagents or electrode replacement. RS485 Modbus RTU output ensures seamless integration with PLC, DCS, SCADA, and industrial IoT monitoring platforms, supporting smart environmental monitoring, industrial process control, and aquaculture management.

Key Features

• Optical Fluorescence Measurement Principle: Fluorescence quenching technology ensures accurate DO monitoring without electrolyte consumption or chemical reagents
• Wide Measurement Range: Supports 0–20 mg/L or 0–200% saturation, configurable for diverse environmental and industrial applications
• High Accuracy and Repeatability: Measurement accuracy ±0.3 mg/L with repeatability ≤0.3 mg/L, providing reliable long-term monitoring
• Fast Response Performance: T90 response time less than 60 seconds, ideal for real-time DO monitoring
• Automatic Temperature and Salinity Compensation: Maintains stable readings under varying environmental conditions
• Low Drift and Long-Term Stability: Zero drift and range drift within ±0.3 mg/L, reducing recalibration frequency and maintenance needs
• IP68 Submersible Design: Waterproof housing supports continuous submersion up to 60 meters in harsh environments
• Industrial Communication Interface: RS485 Modbus RTU output allows direct integration with PLC, DCS, SCADA, and IoT monitoring systems
• Low Maintenance Operation: Optical measurement eliminates electrode fouling, electrolyte loss, and frequent calibration, ensuring stable field performance

Application Scenarios

• Environmental Water Quality Monitoring: Continuous DO measurement in rivers, lakes, and reservoirs
• Wastewater and Industrial Effluent Monitoring: Online dissolved oxygen measurement in wastewater treatment plants, chemical, pharmaceutical, and food production systems
• Aquaculture and Fish Farming: Precise DO management for fish tanks, ponds, and aquaculture facilities
• Industrial Process Water Monitoring: DO monitoring in pipelines, tanks, and laboratory systems for process optimization and safety
• Smart IoT and Remote Monitoring: Integration with telemetry, SCADA, and cloud-based IoT platforms for automated and remote water quality management

Technical Specifications