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1. Working Principle
Many organic compounds dissolved in water absorb ultraviolet light. Therefore, by measuring the absorption of these organic compounds at a wavelength of 254nm, the content of dissolved organic pollutants in water can be accurately measured.
The BT-COD-308 Online COD Sensor employs two light sources: one ultraviolet light for measuring COD content in water, and one reference light for measuring water turbidity. Additionally, through specific algorithms, it compensates for optical path attenuation and can eliminate interference from particulate suspended impurities to a certain extent, achieving more stable and reliable measurements.
2. Product Features
- Dual-Wavelength UV Absorption Method:
- Employs one UV light source for measuring organic pollutants (COD at 254nm) and a second reference light for turbidity, automatically compensating for optical path attenuation and particulate interference.100% Reagent-Free & Eco-Friendly:
- Requires no chemical reagents, eliminating secondary pollution while significantly lowering operational and maintenance costs.Built-In Auto-Cleaning Brush:
- Equipped with an active cleaning brush to prevent biofouling during long-term continuous sub-surface deployment.Multi-Parameter Monitoring: Simultaneously tracks COD, turbidity, and temperature with high precision, fast response times ($<10\text{s}$), and small measurement drift.Rugged Submersible Design:
- Housed in a durable 316L Stainless Steel IP68 enclosure designed for direct submersible installation in harsh aquatic environments.
3. Technical Specifications and Performance
| Model | BT-COD-308 | |
| Measurement Principle | Dual-wavelength Ultraviolet Absorption Method | |
| Measurement Range | COD | Turbidity |
| 0～200mg/L equiv. KHP | 0～100NTU | |
| 0～500mg/L equiv. KHP | 0～200NTU | |
| COD Accuracy | ±5% | |
| Response Time (T90) | ＜10s | |
| Minimum Detection Limit | 0.2mg/L（0-200mg/L） | |
| 0.4mg/L（0-500mg/L） | ||
| COD Resolution | 0.1mg/L | |
| Turbidity Accuracy | ±5% | |
| Turbidity Resolution | 0.1NTU | |
| Calibration Method | Two-point calibration | |
| Output Mode | RS-485（Modbus/RTU） | |
| Power Supply | 12～24VDC | |
| Power Consumption | 0.4W@12V（operating） | |
| 2W@12V（cleaning） | ||
| Storage Temperature | -5～65℃ | |
| Operating Conditions | 0～50℃，＜0.2MPa | |
| Protection Rating | IP68 | |
| Installation Method | Submersible installation | |
| Cable Length | 5 meters; other lengths can be customized | |
| Enclosure Material | 316L Stainless Steel | |
4. Dimension(mm)
