The Core Value and Application Scenarios of COD Sensors in Water Quality Monitoring
Chemical oxygen demand (COD) is a key indicator for measuring the degree of organic contamination in water. The development of its monitoring technology is of great significance to water resource protection. With its real-time and accurate monitoring capabilities, COD sensors have become a core tool in modern water quality management systems and are widely used in various fields, including industrial supervision, municipal treatment, and environmental emergency response.
Technical Principles and Core Advantages of COD Sensors
Working Principle
COD sensors calculate COD values by measuring the amount of oxygen required for the oxidation and decomposition of organic matter in water, based on the principle of quantitative analysis of oxidation reactions. There are two main technical approaches:
Chemical oxidation: Using a strong oxidant such as potassium dichromate, the organic matter is oxidized to carbon dioxide and water under the action of heat and a catalyst. The COD value is determined by monitoring the oxygen consumption or electron transfer during the reaction.
Spectroscopic ****od: Utilizes the characteristic absorption of UV light (e.g., at 254nm wavelength) by organic matter, combined with reference light to compensate for turbidity interference, and converts COD concentration using an algorithm. This ****od requires no chemical reagents and offers a fast response time.
Technical Advantages:
Real-time and Continuous: Enables 24-hour uninterrupted monitoring with data sampling intervals as low as seconds, significantly improving timeliness compared to traditional laboratory testing (which takes hours to days).
Automation and Intelligence: Supports remote data transmission to a cloud platform, integrating AI algorithms for trend prediction and anomaly alerts.
Low Maintenance: Select models feature automatic cleaning brushes (to prevent biofouling) and a low-power design, extending maintenance cycles to several months, making them suitable for deployment in remote areas.
Multi-Scenario Adaptability: Resistant to environmental interference such as temperature and turbidity, it is suitable for a wide range of water bodies, from high-concentration industrial wastewater to low-pollution drinking water sources.
https://www.renkeer.com/product/cod-sensor/