Product Introduction
Self-Cleaning COD Water Quality Sensor Product Introduction
This online COD sensor is equipped with a built-in mechanical wiper self-cleaning structure, which can automatically clean the optical lens at scheduled times, effectively avoiding detection deviations caused by sewage impurities and biological attachment, and greatly reducing the frequency of manual operation and maintenance. The whole unit is IP68 waterproof and dustproof, operates stably underwater around the clock, requires no frequent disassembly for calibration, and is perfectly suited for long-term monitoring needs in complex high-pollution water bodies such as sewage treatment plants and sewage outfalls.
1. Working Principle
Based on LambertBeer's Law: aromatic and conjugated organic matter in water has254nm Ultraviolet light has characteristic absorption; the higher the concentration of organic matter, the more ultraviolet light is absorbed.
Dual-beam light source: one path of 254nm ultraviolet light is used to detect organic matter; one path of visible light / UV reference light, specifically corrects turbidity and color interference.
The sensor detects the light intensity after light passes through the water sample, calculates absorbance, and converts it through built-in calibration algorithms to obtain COD value, and can also convert and output BOD、TOCand permanganate index and other indirect parameters.
Integrated temperature sensor for automatic temperature compensation; most are equipped with motorized self-cleaning brushes to remove sludge and biofilm attachments on the measurement window, reducing drift.
Supplementary note: There are also a few intelligent sensors that use small-scale chemical digestion methods, which require reagent consumption, have larger volumes, and higher operation and maintenance costs. The vast majority of intelligent probes on the market use UV optical methods.
Self-Cleaning COD Water Quality Sensor Product Introduction
2. Main Features
No chemical reagents required, no secondary pollution
No hazardous reagents such as potassium dichromate, concentrated sulfuric acid, or mercury sulfate are used, no toxic waste liquid is produced, significantly reducing consumables and hazardous waste disposal costs.
Second-level rapid measurement,24h Continuous online
A few seconds to30 Outputs a set of data per second, enabling high-frequency continuous monitoring, suitable for capturing sudden water quality changes and overflow pollution peaks; traditional national standard chemical methods require tens of minutes to 2 hours, only intermittent detection possible.
Intelligent compensation and anti-interference
Dual-wavelength algorithm automatically compensates for turbidity, color, temperature, and optical path aging attenuation, adapting to high-turbidity and complex water bodies such as rivers and sewage.
Built-in self-cleaning, low maintenance requirements
Built-in motorized cleaning brush periodically and automatically wipes the optical window, reducing biological fouling and scaling, extending the calibration cycle, suitable for unattended field stations.
Digital intelligent output, easy to connect to IoT
RS485 Modbus RTU as standard interface, some support 4 20mA Analog; built-in chip completes signal processing, data storage, and fault self-diagnosis, and can be directly connected to data acquisition instruments, environmental platforms, buoy monitoring stations, andPLC control systems, supporting remote data viewing.
Hardware protection
IP68 Fully waterproof,316L Stainless Steel / Titanium alloy shell, can be immersed in water for long periods, resistant to sewage corrosion.
Self-Cleaning COD Water Quality Sensor Product Introduction
3. Typical Technical Parameters (General Reference for UV Type)
Measurement principle: dual-wavelength UV absorption method (254nm + reference light)
COD Range:0 100、0 500、0 1000mg/L(multiple ranges optional)
Simultaneous output:CODturbidity, temperature, some output TOC/BOD estimated value
Response time:3 30s
Communication:RS485 Modbus RTU
Protection rating:IP68
Power supply:12 24VDC
Function: automatic turbidity and temperature compensation, motorized self-cleaning
Note: The UV method is an indirect conversion measurement; high salinity and special organic wastewater without UV absorption can cause deviations. Important discharge outlets can be regularly compared and calibrated using national standard chemical methods.
Main Application Areas
- Wastewater Treatment — Real-time monitoring of organic load in influent and effluent to optimize treatment processes and ensure compliance.
- Surface Water Monitoring — Continuous assessment of rivers, lakes, and reservoirs for organic pollution and early warning of contamination events.
- Industrial Process Water — Monitoring COD in cooling water, boiler feedwater, and process streams to prevent scaling and corrosion.
- Drinking Water Safety — Detection of organic matter in source water and distribution networks to ensure drinking water quality.
- Aquaculture — Monitoring organic pollution in aquaculture ponds to maintain healthy aquatic environments and optimize feed management.
Keywords：COD sensor, water quality sensor, self-cleaning sensor, online COD analyzer, UV254 sensor, industrial water monitoring, COD probe, smart water sensor
