Induskey INK260-B/C UV254 Self-Cleaning COD Sensor

1. Product Overview

The INK260-B/C is an online UV254 self-cleaning COD sensor designed for real-time water quality monitoring. It uses ultraviolet absorption technology to achieve reagent-free in-situ measurement of chemical oxygen demand (COD), while simultaneously measuring TOC, turbidity, and temperature. This product solves key problems of traditional COD detection (potassium dichromate method), such as chemical pollution, high maintenance costs, and inability to perform real-time online monitoring. It is highly suitable for long-term unattended water environment monitoring.

Two models are available to cover different pollution levels:

• INK260-B (low range): for lightly polluted water, COD up to 500 mg/L

• INK260-C (high range): for heavily polluted water, COD up to 1500 mg/L

2. Sensing Technology & Self-Cleaning System

2.1 Sensing Principle: UV254 Ultraviolet Absorption Method

The sensor adopts dual-beam UV spectrophotometry at 254 nm. Organic compounds in water show characteristic absorption at this wavelength; the COD concentration is calculated by measuring UV absorbance combined with an optimized algorithm. This is an optical detection method, completely different from traditional chemical digestion.

An independent turbidity channel provides real-time turbidity compensation, automatically eliminating interference from suspended solids. This ensures stable and accurate measurement even in high-turbidity wastewater. The technology requires no chemical reagents, produces no secondary pollution, and enables fast-response real-time monitoring.

2.2 Intelligent Self-Cleaning System

The sensor is equipped with an integrated electric brush self-cleaning mechanism, which regularly removes biofilm, algae, oil, and suspended particles from the optical window. The cleaning interval is user-adjustable, greatly extending the maintenance cycle, reducing manual on-site work, and ensuring stable long-term operation.

3. Key Features & Competitive Advantages

3.1 Reagent-Free & Eco-Friendly

The sensor uses optical detection without any chemical reagents such as potassium dichromate, silver sulfate, or concentrated sulfuric acid. No waste liquid is generated, eliminating secondary pollution and hazardous waste disposal costs. It is environmentally compliant and cost-effective for long-term use.

3.2 Multi-Parameter Integrated Measurement

A single probe simultaneously outputs COD, TOC, turbidity, and temperature. This reduces the number of sensors, lowers installation and wiring costs, saves space, and simplifies system integration and operation.

3.3 Automatic Turbidity Compensation

With a dedicated turbidity measurement channel, the sensor applies real-time algorithmic correction for interference from suspended solids. It maintains high accuracy in highly turbid industrial and municipal wastewater, greatly improving environmental adaptability.

3.4 Intelligent Self-Cleaning & Low Maintenance

The electric brush cleaner supports automatic and manual modes with an adjustable cleaning schedule. It effectively prevents fouling and biofouling, significantly reducing manual cleaning and calibration frequency, especially ideal for remote or unattended sites.

3.5 Corrosion Resistance & High Reliability

The housing is made of 316L titanium alloy with a quartz optical window. It features excellent acid and alkali resistance and an IP68 protection rating, allowing long-term submerged operation in harsh water environments such as industrial wastewater and sewage.

3.6 Low Power Consumption & Easy Integration

The sensor has extremely low power consumption in measurement mode, supporting solar and battery power for field stations. It is equipped with RS485 (Modbus-RTU) and can be easily connected to PLC, data loggers, environmental monitoring platforms, and SCADA systems.

3.7 Field Calibration & Data Traceability

Supports two-point calibration (zero / standard solution) and field water sample calibration. Calibration data is stored automatically and retained after power failure, ensuring measurement accuracy and traceability to meet regulatory requirements.

4. Technical Specifications


5. Applications

1. Industrial Wastewater Discharge Monitoring
Used in chemical, printing and dyeing, pharmaceutical, electroplating, food, paper-making, and other industries for real-time COD monitoring at discharge outlets, ensuring compliance with environmental regulations and preventing excessive discharge.

2. Municipal Wastewater Treatment Plant Monitoring
Applied to influent, anaerobic/aerobic tanks, aeration basins, secondary clarifiers, and effluent. Supports process optimization and aeration control to improve treatment efficiency and reduce operating costs.

3. Surface Water & Drinking Water Source Monitoring
Used for rivers, lakes, reservoirs, and drinking water sources for organic pollution early warning. Low-power design supports long-term unattended field monitoring.

4. Sewer Network & Pumping Station Monitoring
Monitors COD in sewer networks, lift stations, and combined sewer overflows to detect illegal discharge and overflow pollution, supporting urban water environment management.

5. Industrial Circulating Water & Reclaimed Water Monitoring
Monitors organic content in circulating cooling water and reclaimed water to prevent pipeline fouling and equipment corrosion, improving water reuse efficiency.

6. Environmental Research & Laboratory Monitoring
Suitable for water research, laboratory testing, and educational platforms. It provides continuous in-situ data without chemical pollution, supporting scientific research and teaching.