Chinese
Spanish
Products Description
Nexisense RDO-406-A Online Fluorescence Dissolved Oxygen Sensor Product Definition
The Nexisense RDO-406-A Online Fluorescence Dissolved Oxygen Sensor is an advanced sensor designed based on the quenching principle of fluorescence. It monitors the concentration of dissolved oxygen in water, providing precise data support for various water quality testing. This sensor is suitable for laboratory environments and can deliver reliable measurement results in various industrial and natural water bodies.
Principle
The working principle of the Nexisense RDO-406-A is based on the phenomenon of fluorescence quenching. When excitation light shines on the fluorescent material on the sensor's surface, these materials are excited and emit fluorescence. Dissolved oxygen molecules interfere with this process, causing changes in the fluorescence quenching time. The sensor accurately calculates the concentration of oxygen molecules by detecting the phase difference between fluorescence and excitation light, combined with internal calibration curves. After automatic compensation for temperature and salinity, the final accurate measurement value is output.
Structural Analysis
Sensor Structure
The Nexisense RDO-406-A sensor consists of several key components. The following table summarizes its main structure and functionality:
| Component | Function Description |
|---|---|
| Fluorescent Membrane Head | Responsible for the excitation and emission of fluorescence. |
| Built-in Temperature Sensor | Automatically compensates for temperature to ensure accurate measurements. |
| Electronic Signal Processing Unit | Processes measurement signals and outputs data. |
| RS-485 Interface | Provides stable data communication and connection to field devices. |
| Power Supply Module | Ensures the device operates normally under low power consumption. |
Measurement Method
The Nexisense RDO-406-A online fluorescence dissolved oxygen sensor employs a non-consumptive measurement method that does not require electrolytes, preventing polarization and oxygen consumption issues seen in traditional sensors. Its advantages include:
High Accuracy: Low drift and quick response ensure real-time data output.
Strong Interference Resistance: Insensitive to various chemicals (like sulfides), improving measurement reliability.
Easy Maintenance: Simplified fluorescent cap replacement reduces long-term operational costs.
Measurement Process
Excitation Light Emission: The sensor emits excitation light.
Fluorescence Emission: The fluorescent material absorbs light energy and emits fluorescence.
Fluorescence Quenching: Dissolved oxygen molecules affect fluorescence emission.
Data Processing: The internal system calculates dissolved oxygen concentration and compensates for temperature and salinity.
Data Display: Data is transmitted via RS-485 or 4-20 mA interface.
Nexisense RDO-406-A Online Fluorescence Dissolved Oxygen Sensor Technical Performance and Specifications
The following table summarizes the technical performance and specifications of the Nexisense RDO-406-A online fluorescence dissolved oxygen sensor:
| Technical Parameters | Description |
|---|---|
| Measurement Range | 0-20 mg/L |
| Resolution | 0.01 mg/L |
| Accuracy | ±0.2 mg/L or ±2% |
| Response Time | ≤10 seconds |
| Operating Temperature | 0°C - 50°C |
| Operating Pressure | ≤0.5 MPa |
| Salinity Compensation | Yes |
| Power Supply | 12-24 VDC |
| Communication Protocol | RS-485 Modbus/RTU |
| Protection Rating | IP68 |
| Calibration Frequency | Every 6-12 months |
Nexisense RDO-406-A Online Fluorescence Dissolved Oxygen Sensor Application Areas
The Nexisense RDO-406-A is versatile and suitable for various application areas, mainly including:
Aquaculture: Monitors dissolved oxygen levels in water, ensuring the health of aquatic life.
Wastewater Treatment: Real-time monitoring of oxygen content in wastewater to optimize treatment processes.
Industrial Processes: Assists enterprises in controlling water quality, improving productivity.
Environmental Monitoring: Used in rivers, lakes, and other natural water bodies for water quality assessment.
Conclusion
The Nexisense RDO-406-A Online Fluorescence Dissolved Oxygen Sensor, with its advanced fluorescence quenching technology and high reliability, is an ideal choice for water quality monitoring. It not only provides accurate dissolved oxygen data but also offers automatic compensation and lower maintenance costs, making it widely applicable in aquaculture, wastewater treatment, and industrial sectors. Choosing the Nexisense RDO-406-A will enhance your water quality monitoring efforts to a new level.
