NBL-WQ-COD-408-S Online Industrial COD Sensor for wastewater treatment, wastewater monitoring, and smart water managemen···

Green Monitoring New Heights: NiuBoL Digital UV254 Online COD Sensor

Say goodbye to chemical reagents and secondary pollution, building a long-term stable monitoring foundation for smart water systems.

• Dual-wavelength absorption method: Uses 254nm UV light and a reference optical path to automatically offset turbidity interference, ensuring data accuracy.

• Built-in automatic cleaning wiper: Effectively prevents biological fouling and contaminant masking of the optical window, minimizing maintenance frequency.

• Fully digital integration architecture: Standard RS485 Modbus RTU, no expensive secondary instruments required, directly interfaces with various control systems.

NBL-WQ-COD-408-S Online COD Sensor Product Overview

In modern environmental monitoring and wastewater treatment processes, Chemical Oxygen Demand (COD) is a key indicator for measuring organic pollution levels in water. Traditional chemical methods (dichromate method) require bulky instruments, hazardous reagents, and produce secondary pollution.

NiuBoL NBL-WQ-COD-408-S Online COD Sensor is based on the principle of specific absorption of 254nm ultraviolet light by organic substances, achieving real-time monitoring without reagents, pollution, and with high frequency. This sensor not only measures COD but also simultaneously outputs turbidity and temperature data. With its precise algorithm compensation and self-cleaning technology, NiuBoL provides system integrators and engineering contractors with a digital sensing solution that aligns with environmental trends while delivering exceptional economic benefits.

NBL-WQ-COD-408-S Online COD Sensor Core Technical Advantages

1. Innovative Dual-Wavelength Measurement & Algorithm Compensation

NBL-WQ-COD-408-S uses two independent light sources. The main light source emits 254nm UV light to detect organic content; the reference light source measures water turbidity. Through an internal specific compensation algorithm, the sensor automatically eliminates the interference of particulate suspended solids on absorbance. Even under fluctuating water quality conditions, it outputs stable and reliable COD values, significantly reducing measurement deviations caused by environmental noise.

2. Physical Measurement, No Chemical Secondary Pollution

As an optical sensor, NBL-WQ-COD-408-S requires no chemical reagents throughout the entire measurement process. This not only avoids secondary pollution from waste liquid treatment but also thoroughly solves the pain points of traditional chemical analyzers: slow response, expensive reagents, and easy clogging of tubing. It is an ideal alternative for projects seeking economy, environmental protection, and continuous uninterrupted monitoring.

3. Built-in Automatic Cleaning System for Long-term Low Maintenance

In long-term online monitoring, optical windows are prone to failure due to biofouling or dirt accumulation. NiuBoL equips this series with a standard automatic cleaning wiper. Users can set the cleaning frequency according to the on-site environment, ensuring the measurement window remains clean, and measurement stability is maintained over periods of 18 months or even longer. This design greatly reduces on-site manual maintenance workload.

4. Industrial Grade 316L Material & IP68 Protection

For harsh conditions such as wastewater treatment plants and chemical plants, the sensor housing is made of high-quality 316L stainless steel with excellent corrosion resistance. With the highest IP68 protection rating, the sensor can be submerged in water up to 2 meters deep continuously, withstanding moisture, high pressure, and the complex chemical environment of industrial wastewater.

NBL-WQ-COD-408-S Online COD Sensor Technical Specifications

Typical Applications

• Wastewater Treatment Process Monitoring: Real-time monitoring of influent and effluent COD concentrations, optimizing aeration and ensuring discharge compliance.

• River & Surface Water Monitoring: Deployed in environmental monitoring stations for online grid monitoring, quickly detecting organic pollution incidents.

• Industrial Wastewater Online Monitoring: Real-time monitoring at discharge outlets in papermaking, printing & dyeing, chemical industries, helping enterprises achieve closed-loop environmental compliance.

• Smart Water System Integration: As a core sensing layer component, connects to edge computing gateways or cloud platforms for digital twins of urban water environments.

Wiring Definition & Installation Guidelines

Electrical Wiring Definition (5-core shielded cable)

• Red wire: Power positive (12～24V DC)

• Black wire: Power ground (GND)

• Blue wire: RS-485 A

• White wire: RS-485 B

• Yellow wire: 4-20mA (optional, leave open if not used)

Physical Installation Points

1. Position selection: Horizontal installation is recommended, with the measurement area facing the water flow direction to reduce bubble accumulation.

2. Depth control: The sensor should be submerged at least 30cm below the minimum water level, but not more than 2 meters deep.

3. Impact protection: In turbulent flows, reinforce the sensor and use cable protection sleeves to prevent impact damage or cable breakage.

FAQ

Q1: Are the measurements from the NiuBoL online COD sensor consistent with laboratory dichromate method?
A: The UV absorption method has good correlation with chemical methods. For specific water quality, by using the "slope calibration" function provided by NiuBoL for on-site correction, the measurement results can be kept highly consistent with the laboratory method.

Q2: Does this sensor require regular reagent replacement?
A: No. NBL-WQ-COD-408-S uses completely optical physical measurement, consuming no chemical reagents, greatly reducing operational costs.

Q3: Do air bubbles in the water affect measurement results?
A: Bubbles cause light scattering and reading fluctuations. We recommend installation in locations with fewer bubbles, horizontal orientation, and ensure no attached bubbles on the measurement window before measuring.

Q4: How often does the automatic cleaning wiper work?
A: The cleaning frequency can be flexibly set via Modbus commands according to on-site water quality. If the water quality is poor and prone to scaling, we recommend increasing cleaning frequency.

Q5: What causes large fluctuations in displayed values during operation?
A: First check if the measurement window is obstructed or if the cleaning wiper is functioning properly. Additionally, if the water turbidity exceeds the sensor range, it can also affect COD compensation accuracy.

Q6: What standard solution should be used for calibration?
A: COD calibration typically uses a standard solution prepared with potassium hydrogen phthalate (KHP). Please refer to the manual for preparation details. Temperature and turbidity should be calibrated before COD calibration.

Q7: Can the cable be cut and extended by myself?
A: It is recommended to be done by professionals. RS-485 communication is stable within 1000 meters, but ensure the power supply voltage still meets above 12V after long-distance transmission, and make waterproof insulation connections.

Q8: Why does the manual mention returning to factory after 18 months?
A: To ensure the sensor's sealing performance under deep water pressure, we recommend returning the sensor to the factory every 18 months to replace the dynamic sealing device and perform comprehensive inspection and maintenance of the self-cleaning system.

Summary & Engineering Support

NiuBoL NBL-WQ-COD-408-S sensor combines high efficiency, low cost, and high stability, making it a "cost-effective and efficiency-boosting" tool for today's digital environmental monitoring projects. Its reagent-free and low-maintenance features demonstrate strong adaptability in unattended remote monitoring stations or complex industrial sites.

Are you looking for an online COD solution that truly achieves long-term stable operation without cumbersome post-maintenance? NiuBoL provides technical support for integrators, helping you quickly build a reliable and stable monitoring link.

NBL-WQ-COD-408-S Online COD Sensor Data Sheet

NBL-WQ-COD-408-S Online COD Sensor.pdf