AL4010 UV-COD Water Quality Sensor: In-Situ Organic Content Online Monitoring Integrated Solution

In sewage treatment, industrial wastewater treatment and surface water environmental monitoring projects, COD, as an important indicator of the total amount of organic pollutants, directly affects process control, emission compliance and water environment quality assessment. System integrators and engineering contractors need high-stability, low-maintenance online measurement equipment to reduce chemical reagent consumption and manual intervention. The Nexisense AL4010 UV-COD water quality sensor adopts dual-wavelength ultraviolet absorption spectroscopy technology and simultaneously outputs COD, SAC254 and turbidity data, providing professional edge hardware support for building multi-parameter water quality monitoring systems.

The sensor achieves true in-situ measurement without the need for sampling pipelines or complex pretreatment, significantly simplifying on-site deployment structure. The dual optical path versions (30mm and 5mm) cover the application range from low-concentration surface water to high-concentration industrial wastewater. The standardized RS485 Modbus interface facilitates quick access to existing PLC, RTU or IoT platforms.

AL4010 UV-COD Sensor Technical Principle and Core Advantages

AL4010 is based on ultraviolet absorption spectroscopy, utilizing the characteristic absorption of organic matter in the ultraviolet band, simultaneously measuring SAC (ultraviolet absorbance) at 254nm and turbidity, and realizing accurate conversion of COD value through algorithms. The dual-wavelength design combined with dual-reference optical path effectively compensates for light source intensity fluctuations, turbidity interference and chromaticity effects, ensuring long-term stability of measurement results.

The real-time turbidity compensation function dynamically corrects COD and SAC readings according to the current turbidity value, maintaining high accuracy even at higher turbidity levels. Factory pre-calibration parameters are stored inside the sensor, and users can restore the benchmark state at any time through software, reducing the frequency of on-site calibration. The combination of semiconductor LED light source and photodetector provides a service life of more than 10 years, further reducing life-cycle costs.

The sensor supports local large-capacity historical data storage, retaining key records even in the event of communication interruption. The interface is equipped with misconnection and reverse connection protection, combined with 3kV-level electrical isolation design, enhancing anti-interference capability in industrial sites. The IP68 protection rating and 316L stainless steel shell ensure long-term reliable operation of the equipment in harsh water quality environments.

These technical features enable the AL4010 to output stable and consistent measurement data under conditions of extremely low maintenance workload, making it suitable for engineering projects requiring continuous monitoring.

30mm and 5mm Optical Path Version Selection Guide

· 30mm optical path version: Applicable to surface water, rainwater and low-concentration wastewater monitoring. COD range 0-100mg/L, SAC 0-50m⁻¹, turbidity 0-100NTU, accuracy 3%FS. Suitable for environmental monitoring sections, drinking water source areas or secondary treatment effluent of sewage treatment plants and other scenarios.

· 5mm optical path version: Designed for medium-high concentration industrial wastewater and process water. COD range 0-800mg/L, SAC 0-350m⁻¹, turbidity 0-1500NTU, accuracy 5%FS. Applicable to online monitoring of high organic load wastewater in chemical, pharmaceutical, printing and dyeing industries.

Both versions have a response time of 10 seconds, repeatability of 0.5%, and zero point and range drift controlled within 2%FS. Integrators can make reasonable selections based on project water quality concentration distribution and expected measurement accuracy to achieve the best cost-performance ratio.

Application Scenarios and System Integration Value

In surface water and rainwater monitoring projects, the AL4010 can be directly submerged in river channels, lakes or rainwater collection wells to achieve continuous collection of organic matter content, supporting water environment quality assessment and pollution traceability. Sewage treatment plants can deploy it at inlet, aeration tank or outlet, and optimize aeration volume and dosing control in combination with turbidity compensation data.

In industrial wastewater treatment systems, the sensor is suitable for regulating tanks, anaerobic/aerobic treatment units and discharge outlet monitoring, providing real-time basis for compliance with emission standards. The in-situ design does not require additional sampling pumps and pipelines, reducing clogging risks and maintenance points, and is particularly suitable for space-constrained or highly corrosive working conditions.

For system integrators, the RS485 Modbus protocol is the greatest convenience. The sensor, as a standard slave device, can be mounted on the same bus with other Nexisense sensors such as pH, ammonia nitrogen and suspended solids, and realize centralized upload of multi-parameter data through a single gateway. The included UV-COD data analysis software supports parameter configuration, zero point/single-point to three-point calibration, real-time measurement and fault diagnosis, accelerating on-site debugging and later operation and maintenance.

In IoT solutions, the digital signal output by the AL4010 is easy to map directly to cloud platform registers, supporting historical trend analysis, alarm threshold setting and remote diagnosis. The low power consumption (1W) and wide voltage input (12-36VDC) features make it easy to adapt to solar power supply systems and are suitable for remote monitoring stations.

Technical Parameter Specifications

AL4010 UV-COD Water Quality Sensor Parameter Comparison

Deployment, Maintenance and Engineering Considerations

For on-site deployment, it is recommended to install the sensor vertically in a location with strong representativeness of water flow and fewer impurities to avoid bubble accumulation and direct strong light. The IP68 protection and corrosion-resistant shell support long-term submersion without the need for frequent removal for maintenance. The real-time turbidity compensation algorithm reduces measurement deviations caused by particulate interference in traditional methods.

In terms of maintenance, since no chemical reagents or complex pretreatment are required, daily work mainly involves regular optical window cleaning and software calibration verification. Factory pre-calibration parameters can be restored at any time. Combined with the local data storage function, even short-term communication interruption will not lose historical records. Fault self-diagnosis can output abnormal status through Modbus registers, facilitating timely response from remote monitoring systems.

In multi-parameter monitoring cabinet design, integrators can unify the power supply and communication bus of the AL4010 with other Nexisense sensors, simplifying cabinet structure and lightning protection design. The wide voltage range adapts to different on-site power conditions and improves overall system reliability.

FAQ

Q1. How to select the AL4010 30mm and 5mm optical path versions according to project water quality concentration?

The 30mm optical path is suitable for low-concentration applications (such as surface water, rainwater, secondary effluent), providing higher accuracy (3%FS) and lower range. The 5mm optical path is suitable for medium-high concentration industrial wastewater (COD up to 800mg/L) with stronger high-turbidity resistance. Integrators should select based on historical water quality data and maximum expected concentration to avoid range waste or insufficient accuracy.

Q2. How to integrate the AL4010 sensor into existing SCADA or PLC systems?

The sensor adopts the standard RS485 Modbus-RTU protocol and supports multi-device mounting. After engineers assign a unique slave address, they can read COD, SAC254, turbidity and diagnostic registers through PLC serial port or Modbus gateway. The included software can assist in verifying communication and register mapping, shortening driver development time.

Q3. What is the actual effect of the turbidity compensation function in high-turbidity wastewater?

AL4010 measures turbidity in real time and dynamically compensates COD and SAC values. Under specified turbidity conditions (750NTU for 30mm version, 100NTU for 5mm version), COD error is controlled within 10%FS. In actual projects, it is recommended to verify compensation parameters in combination with on-site turbidity distribution to ensure the algorithm matches the process medium.

Q4. Does the AL4010 require frequent calibration during long-term operation?

The sensor adopts a dual-reference optical path design with excellent long-term stability, and factory pre-calibration parameters support restoration at any time. It is recommended to perform zero point or single-point calibration verification every 3-6 months according to operating data trends. No chemical reagents or complex pretreatment are required, significantly reducing calibration workload.

Q5. How is the durability of the sensor ensured in industrial wastewater environments with strong corrosiveness?

The shell is made of 316L stainless steel with IP68 protection rating, suitable for most acid-base wastewater. The optical path block and optical window have undergone corrosion-resistant treatment. It is recommended to regularly check the water flow conditions at the installation location to avoid long-term accumulation of locally high-concentration corrosive substances. The electrical interface protection circuit further improves on-site reliability.

Q6. How does the AL4010 local data storage function help system reliability?

The sensor has a built-in large-capacity storage module that can continue to record measurement data during communication interruption. After network recovery, historical records can be retransmitted through software or platform. This function is particularly suitable for remote stations or environments with unstable networks, ensuring that key process data is not lost and supporting post-event analysis and compliance traceability.

Summary

The Nexisense AL4010 UV-COD water quality sensor takes dual-wavelength ultraviolet absorption technology as the core, combined with real-time turbidity compensation and dual-reference optical path design, providing system integrators and engineering contractors with an in-situ, high-stability organic matter online monitoring solution. The 30mm and 5mm optical path versions cover a wide range of application concentrations. The RS485 Modbus protocol and IP68 protection ensure integration convenience and on-site reliability.

The sensor’s characteristics of no chemical reagents and no frequent calibration effectively reduce project operation and maintenance costs and secondary pollution risks. Through combination with other Nexisense water quality sensors, a complete multi-parameter water quality monitoring network can be built to support engineering needs such as surface water protection, sewage treatment process optimization and industrial wastewater compliance discharge.

If your project involves COD online monitoring, organic content control or water quality multi-parameter system integration, please feel free to contact the Nexisense technical team. We will provide professional sensor selection, communication configuration and system solution support according to specific water quality conditions, integration architecture and on-site environment to jointly promote the efficient and reliable implementation of water treatment monitoring projects.