AL4150 Residual Chlorine Water Quality Sensor and AL4150H Hypochlorous Acid Water Quality Sensor: Online Monitoring Solutions for Disinfection Processes in Industrial Water Treatment

In industrial water treatment, municipal water supply, and sewage treatment projects, real-time and accurate data on residual chlorine and hypochlorous acid concentrations are the key basis for disinfection effect verification, dosage optimization, and emission compliance. The Nexisense AL4150 series water quality sensors address the actual needs of system integrators, engineering companies, and project managers by providing a membraneless design, standardized communication interfaces, and low-maintenance solutions. The sensors can be directly immersed in the water body for in-situ measurement. Combined with the RS485 Modbus-RTU interface and WQS-SUTIE analysis software, it significantly simplifies on-site deployment, system integration, and daily operation and maintenance, helping to build a stable and reliable disinfection monitoring system.

AL4150 Residual Chlorine Water Quality Sensor Product Details

The Nexisense AL4150 residual chlorine water quality sensor adopts a three-electrode constant voltage measurement system, meeting EPA330.1 standard requirements, while introducing a reference electrode to effectively suppress electrode drift and ensure long-term stability of measurement results. The product eliminates the traditional membrane structure, so there is no need to replace the membrane during use, making cleaning and maintenance operations simpler. The built-in NTC sensor realizes automatic temperature compensation and supports combined use with a pH sensor for pH value compensation. It collects reaction current in real-time with a fast response, and measurement results are not interfered with by water sample turbidity or color, allowing direct application in complex water environments.

The sensor supports an RS485 communication interface and follows the standard MODBUS-RTU protocol, facilitating network integration with existing PLC, RTU, or central control systems. The included WQS-SUTIE analysis software can realize functions such as parameter setting, calibration operation, real-time measurement display, and fault diagnosis, further reducing the difficulty of engineering debugging. The 3KV voltage-resistant isolated power supply combined with the interface misconnection and reverse connection protection design enhances anti-interference capability and on-site installation safety.

AL4150 Residual Chlorine Water Quality Sensor Product Specifications

AL4150H Hypochlorous Acid Water Quality Sensor Product Details

The Nexisense AL4150H hypochlorous acid water quality sensor is also based on the three-electrode constant voltage measurement system, complying with the EPA330.1 standard, and introduces a reference electrode to ensure measurement stability. The membraneless design makes daily cleaning and maintenance more convenient, with no need to worry about additional costs caused by membrane aging or replacement. The built-in NTC sensor enables automatic temperature compensation, collects reaction current in real-time, has a short response time, and the measurement results are not affected by water sample turbidity or color. It is suitable for disinfection scenarios requiring precise control of hypochlorous acid active ingredients.

The sensor provides an isolated RS485 interface and standard MODBUS-RTU protocol, supporting fast network integration. The included WQS-SUTIE analysis software can complete the entire process of parameter configuration, calibration, measurement, and fault diagnosis. The 3KV voltage-resistant isolated power supply and interface protection function together enhance the reliability of the device in industrial sites.

AL4150H Hypochlorous Acid Water Quality Sensor Product Specifications

Core Technical Advantages

Both sensors adopt a combination of a three-electrode constant voltage system and a reference electrode, which significantly improves measurement stability and anti-interference performance. The membraneless design completely eliminates membrane-related consumables and maintenance work. Factory DPD method calibration parameters support one-key recovery on-site, reducing the frequency of periodic calibration. Built-in NTC automatic temperature compensation combined with the AL4150's pH compensation function ensures output data consistency under different pH conditions, meeting the fine control requirements of disinfection processes.

At the hardware level, the 3KV voltage-resistant isolated power supply and misconnection/reverse connection protection functions effectively handle on-site power fluctuations and wiring errors. PVC material balances hygienic requirements with corrosion resistance, and the IP68 protection grade supports long-term immersion installation, adapting to high-humidity environments such as water plants and sewage treatment plants without additional protection. The standardized RS485 Modbus-RTU interface ensures efficient connection with PLC, RTU, or central control systems, reducing system integration costs.

Typical Application Scenarios

In water plants and secondary water supply systems, the AL4150 residual chlorine water quality sensor can monitor total residual chlorine concentration in real-time. Combined with pH compensation, it achieves precise dosing control, avoiding excessive residuals or insufficient disinfection. Network terminal monitoring points can quickly access remote monitoring networks using compact sizes and RS485 interfaces, achieving closed-loop management of terminal water quality safety.

In medical disinfection and swimming pool water circulation, the 0.03mg/L detection limit can accurately track low-concentration changes, meeting process refinement requirements. The AL4150H hypochlorous acid water quality sensor is particularly suitable for industrial water circulation and sewage treatment plant effluent disinfection, where attention focuses on the HOCl active ingredient. Its characteristic of being unaffected by water sample turbidity or color makes it ideal for high suspended solids wastewater scenarios. Both products transmit data directly via the Modbus protocol, providing reliable process parameters for engineering companies, optimizing dosing strategies, and reducing operating costs.

Frequently Asked Questions

Q1: Can the AL4150 series sensors maintain measurement accuracy in high turbidity or colored wastewater?
The constant voltage three-electrode method combined with the reference electrode design ensures that measurement results are not interfered with by water sample turbidity or color. NTC temperature compensation and AL4150 pH compensation functions together guarantee data stability, making it suitable for complex water environments such as sewage treatment plant effluent or industrial circulating water.

Q2: How does the sensor realize seamless integration with existing PLC or SCADA systems?
The isolated RS485 interface adopts standard MODBUS-RTU protocol, supporting direct access to PLC, RTU, or central control systems; WQS-SUTIE analysis software can assist in completing address settings and communication testing without additional protocol conversion modules.

Q3: What is the actual impact of the membraneless design on long-term operation and maintenance costs?
There is no need to replace membranes, and daily maintenance only requires simple cleaning to restore performance. Factory calibration parameters support recovery at any time, and the overall maintenance frequency and consumable costs are significantly lower than traditional membrane-based sensors.

Q4: How does the pH compensation function of the AL4150 play a role in actual projects?
The AL4150 supports combined use with a pH sensor to perform real-time compensation within the 6-10pH range, ensuring accurate residual chlorine measurements under different pH conditions. This meets process control needs where pH fluctuations are large, such as in water plants or swimming pool water treatment.

Q5: What are the application advantages of the equipment power and interface protection design in industrial sites?
The operating voltage of 7-30VDC is compatible with various site power sources. The 3KV voltage-resistant isolated power supply combined with misconnection and reverse connection protection functions effectively handles power fluctuations and wiring errors, reducing the probability of equipment failure during engineering debugging and operation and maintenance stages.

Q6: What conveniences can WQS-SUTIE analysis software provide during the project delivery phase?
The software supports batch configuration of parameters, real-time measurement display, historical data export, and fault diagnosis. One-key recovery of factory calibration facilitates engineering companies in quickly completing equipment acceptance, system commissioning, and customer training on-site.

Summary

Nexisense AL4150 residual chlorine water quality sensor and AL4150H hypochlorous acid water quality sensor provide monitoring hardware solutions suitable for various water treatment disinfection scenarios with constant voltage three-electrode technology, membraneless low-maintenance design, standardized communication interfaces, and reliable protection performance. In the actual deployment of water plants, industrial water circulation, and sewage treatment fields, it can effectively improve data collection efficiency and reduce the total cost of ownership of the system. For detailed technical parameters, integration guidance, or prototype testing support, please contact the Nexisense engineer team to jointly promote the stable implementation of water quality disinfection monitoring projects.