UV water quality sensor DUVCOD-600

turbidityBODCOD

Product Overview
Based on the absorption of ultraviolet light by organic matter, spectroscopic COD sensor adopts the 254 nm spectral absorption coefficient SAC254 which is used to reflect the important measurement parameters of the soluble organic matter content in water, and it can be converted into COD value under certain conditions. This method allows for continuous monitoring without the need for any reagents. This product is widely used in the continuous monitoring of organic matter load in the sewage treatment process, on-line real-time monitoring of inlet and outlet water quality of sewage plant; continuous on-line monitoring of surface water, drainage of wastewater from industrial and fishery fields.

Measurement Principle
This Online Digital COD Sensor Probe operates based on the ultraviolet (UV) absorption principle of organic matter. It utilizes the spectral absorption coefficient SAC254 (at 254 nm wavelength) to quantify the concentration of soluble organic compounds in water. Under specific application conditions, the measured SAC254 values can be converted to equivalent COD (Chemical Oxygen Demand) or BOD (Biochemical Oxygen Demand) values. This reagent-free method enables continuous, real-time monitoring without the need for chemical additives or complex sample processing.

Key Features

• Direct Immersion Measurement: Probe-style design allows direct immersion in water, eliminating the need for sampling, pretreatment, or additional sample delivery systems.
• Reagent-Free & Eco-Friendly: No chemical reagents required, avoiding secondary pollution and reducing operational costs.
• Rapid & Continuous Monitoring: Short response time supports real-time continuous data acquisition, capturing dynamic changes in organic load promptly.
• Compact & Energy-Efficient: Equipped with an LED light source, featuring small footprint, low power consumption, and easy on-site integration with existing monitoring systems.
• Automated Maintenance: Integrated automatic cleaning function reduces manual maintenance workload and ensures long-term measurement stability.
• Robust Protection Mechanisms: Includes reverse polarity protection for the power supply and protection against incorrect wiring (RS485 A/B terminals connected to power), enhancing operational safety and sensor durability.
• Comprehensive Data Management: Integrated time display, data storage, and historical data review functions for convenient tracking, analysis, and reporting.
• Flexible Connectivity: Supports RS485 communication interface (Modbus protocol) and offers an optional wireless data transmission module for remote monitoring and system expansion.

Applications

• Sewage Treatment Plants: Continuous monitoring of organic load during sewage treatment processes; real-time online monitoring of influent and effluent water quality to ensure compliance with discharge standards.
• Environmental & Industrial Monitoring: Continuous on-line monitoring of organic pollutants in surface water, industrial effluent (e.g., chemical, textile, food & beverage, pharmaceutical industries), and fishery wastewater.
• Water Quality Management: Suitable for monitoring water quality in lakes, rivers, reservoirs, and other natural water bodies, as well as process water in industrial production lines.

Specifications
Specifications
Details
Measurement Range
COD (KHP was used for calibration): 0~1000mg/L (5mm); Turbidity: 10~1000NTU
Measurement Accuracy
COD: ±5% or ±1mg/L (KHP standard solution); Turbidity: ±10%
Repeatability
±5% (KHP standard solution)
Resolution Ratio
COD: 0.01 mg/L; Turbidity: 0.01NTU
Pressure Range
≤0.1Mpa
Material
Machine: SUS316L (Ordinary Version), Titanium alloy (Seawater Version); Cable: PUR
Power Supply
9~36VDC
Communication Protocol
MODBUS RS485
Storage Temperature
-15 ~ 50℃
Operating Temperature
0 ~ 45℃ (not freeze)
Weight
0.8KG
Level of Protection
IP68/NEMA6P
Cable Length
10-meter standard cable which can be extended up to 100 meters.

Technical Characteristics / Specifications

• Measurement Principle: UV absorption at 254 nm (SAC254)
• Measurement Range: COD 0~1000mg/L (KHP calibrated), Turbidity 10~1000NTU
• Accuracy: COD ±5% or ±1mg/L, Turbidity ±10%
• Repeatability: ±5% (KHP standard solution)
• Resolution: COD 0.01 mg/L, Turbidity 0.01NTU
• Pressure Range: ≤0.1Mpa
• Material: SUS316L or Titanium alloy (seawater version), Cable: PUR
• Power Supply: 9~36VDC
• Communication: MODBUS RS485
• Storage Temperature: -15 ~ 50℃
• Operating Temperature: 0 ~ 45℃ (not freeze)
• Weight: 0.8KG
• Protection: IP68/NEMA6P
• Cable: 10m standard, extendable to 100m