The CODcr online automatic water quality automatic monitoring instrument tests water quality by using potassium dichromate high-temperature digestion colorimetric measurement. Chemical oxygen demand (COD) is checked in industrial, residential, aquaculture, park, and other waterways around the clock. With precise measurement, sealed digestion, intelligent control, and data uploading, the device meets the criteria for environmental protection supervision, business pollution monitoring, and water quality standard approval. The main tools for keeping an eye on pollution sources online.
★★★★★
Automatic monitoring instrument characteristics
Core Technical Parameters
| Item | Specification |
|---|---|
| Measurement Method | Potassium dichromate digestion + colorimetric detection |
| Measuring Range | 0–500 mg/L / 0–2000 mg/L (auto-switchable, customizable) |
| Lower Detection Limit | ≤15 mg/L |
| Measurement Cycle | Min. 30–50 minutes |
| Repeatability | ≤5% |
| Zero Drift | ±5 mg/L |
| Span Drift | ≤3%–5% |
| Calibration Mode | Auto / manual (1–99 days adjustable) |
| Data Storage | ≥1 year |
| Signal Output | 2×4–20mA analog; RS232 / RS485 digital |
| Display | Touch screen |
| Power Supply | AC 220 V ±10%, 50/60 Hz |
| Operating Environment | Temp: 5–40 ℃; Humidity: ≤85% (non-condensing) |
| Maintenance Interval | >1 month |
Core principle
The water sample was dissolved with potassium dichromate oxidant and silver sulfate catalyst in a high-temperature sealed environment at 170 ℃, and the organic matter was oxidized, resulting in a characteristic change in the color of the solution; The instrument detects changes in absorbance through a photoelectric system and automatically converts them into COD concentration values based on standard curves, achieving accurate, stable, and rapid quantitative analysis.
Featured Applications
- Online monitoring of pollutant discharge outlets in industrial enterprises such as chemical, pharmaceutical, printing and dyeing, electroplating, food, and papermaking
- Real time monitoring of inlet and outlet water quality of urban sewage treatment plants
- Supervision of centralized wastewater treatment facilities in industrial parks
- Automatic monitoring station for water environment of rivers, watersheds, and cross-sections
- Monitoring the discharge of pollution sources such as livestock and poultry breeding and agricultural wastewater
Installation and Maintenance
- Things you need to install：You need a separate monitoring station that is at least 10 square meters in size, with a level, corrosion-resistant floor, air conditioning, a solid power source, and adequate grounding.
- Requirements for pipelines：The sampling tube, overflow tube, and waste liquid tube are all set up independently so that there is no blockage or backflow. This keeps the water samples stable while they are being moved.
- Regular upkeep：Do maintenance once a month for about one to two hours each time, and change out reagents, consumables, and peristaltic pump tubing on a regular basis.
- Cleaning and taking care of:Automatic cleaning of pipelines and regular cleaning of measurement tubes and digesting units to keep them from getting blocked or crystallizing.
- Managing Calibration:It can be calibrated automatically or manually, and the cycle can be set to last anywhere from 1 to 99 days, making sure that readings stay accurate over time.
- Treatment of waste fluids:Collect and analyze waste liquids in a consistent way, get rid of them in a way that follows hazardous waste rules, and don’t let them out directly.
Technical Support
Top 6 Industrial Gas Analyzers Manufacturers 2025
6 Best Industrial Gas Detector Manufacturers in the World
9 Best Portable Carbon Dioxide Detector 2025 – Complete Buying Guide
Top 7 portable combustion analyzer Tested
This CODcr water quality online automatic monitoring device has the core advantages of precise measurement, stable operation, low consumption and easy maintenance, fully meeting the online monitoring and environmental protection networking needs of industrial wastewater, municipal sewage, industrial parks and watershed water environment. The instrument is easy to operate, safe and reliable, and can effectively assist enterprises in meeting emission standards, reducing operation and maintenance costs, and implementing environmental risk control. It is an ideal choice for online monitoring and compliance management of pollution sources.
Request a Quote
