DO-100 Fluorescent Dissolved Oxygen Sensor

Overview

The DO-100 is a professional-grade fluorescent dissolved oxygen sensor featuring 316L stainless steel construction for reliable performance in demanding environments. Using advanced optical technology, the DO-100 provides accurate, maintenance-free DO monitoring without consuming oxygen or requiring frequent calibration. The robust stainless steel body ensures years of reliable service in aquaculture, wastewater treatment, and environmental monitoring applications.

Key Features

• Fluorescent Technology: No oxygen consumption, stable long-term readings
• Wide Measurement Range: 0-20 mg/L and 0-200% saturation
• High Accuracy: ±2% full scale precision
• 316L Stainless Steel: Corrosion-resistant for harsh environments
• Automatic Temperature Compensation: Integrated PT1000 sensor
• Digital Output: RS485 Modbus RTU communication
• IP68 Waterproof: Fully submersible operation
• Long Cable Options: Standard 5m, extendable to 100m
• Replaceable Cap: Field-replaceable membrane for easy maintenance
• No Stirring Dependency: Accurate readings in still or flowing water

Applications

• Aquaculture and fish farming
• Shrimp and shellfish cultivation
• Wastewater treatment plants
• Aerobic/anaerobic process control
• Drinking water quality monitoring
• Environmental water monitoring
• Industrial process water
• Brewery and beverage production
• Research and laboratory use

Technical Specifications

The DO-100 uses fluorescent quenching technology where dissolved oxygen quenches the fluorescence of a special dye. Blue light excites the fluorescent dye, and the sensor measures the phase shift of the returned red light, which correlates to oxygen concentration. This optical method provides superior performance compared to traditional electrochemical sensors.

Understanding Dissolved Oxygen

Dissolved oxygen is critical for aquatic life and biological processes. Typical levels include:

• Healthy water: 7-10 mg/L
• Fish farming: > 5 mg/L required, > 7 mg/L optimal
• Shrimp farming: > 4 mg/L minimum, > 6 mg/L optimal
• Wastewater aeration: 2-4 mg/L for activated sludge
• Hypoxic (low oxygen): < 2 mg/L

Factors affecting DO include temperature, salinity, organic load, and aeration. The DO-100’s automatic temperature compensation ensures accurate readings across varying conditions.

Advantages of Fluorescent Technology

vs. Traditional Electrochemical Sensors:

• No oxygen consumption during measurement
• No stirring sensitivity - works in still water
• Minimal drift over time
• No warm-up time required
• Longer lifespan with less maintenance
• More stable readings

Installation and Operation

The DO-100 is designed for easy installation with vertical or horizontal mounting options. The sensor should be fully submerged in the water being monitored, positioned to avoid air bubbles on the membrane cap. Installation locations should provide representative water flow and easy access for periodic maintenance.

Calibration is simple with one-point air calibration. Remove the sensor, expose the moist membrane cap to ambient air, and set to 100% saturation. Monthly calibration is recommended for optimal accuracy.

Maintenance consists of periodic cleaning of the membrane cap to remove biofouling. The replaceable membrane cap can be easily changed in the field when needed (typically every 1-2 years).

Connectivity and Integration

The DO-100’s RS485 Modbus RTU interface enables seamless integration with:

• SCADA systems for plant control
• Data loggers for continuous monitoring
• Wireless telemetry for remote access
• Aeration control systems
• Alarm and notification systems
• Cloud platforms for IoT connectivity

316L Stainless Steel Construction

The DO-100’s 316L stainless steel body provides:

• Excellent corrosion resistance in water and chemicals
• Durability for long-term field deployment
• Easy cleaning and maintenance
• Temperature stability
• Chemical compatibility with most cleaning agents

Why Choose DO-100

• Professional quality: Industrial-grade sensor for reliable operation
• Low maintenance: Minimal servicing requirements
• Long warranty: 3-year manufacturer warranty
• Proven technology: Fluorescent method used worldwide
• Cost-effective: Optimize processes and prevent losses
• Versatile: Suitable for freshwater, brackish, and light industrial applications