Chemical Oxygen Demand ( COD ) Sensor RS485 Stable And Reliable Measurement
Measuring Principle Of The COD sensor
Chemical oxygen demand is a test that measures the amount of oxygen required to chemically oxidize organic substances present in water.
Many organic substances dissolved in water absorb ultraviolet rays, and the electromagnetic spectrum ranges from 200 to 390 nm. The simplest form of measurement using this principle is the Spectral Absorption Coefficient (SAC), which can measure the absorption of light at a specific wavelength. Traditionally, a wavelength of 254nm is used because it is located in an area sensitive to organic absorption.
Therefore, by measuring the degree of absorption of ultraviolet light with a wavelength of 254 nm by organic substances, the substitution of organic substances in water can be detected.
The chemical oxygen demand(COD) sensor can be used in a wide range of applications.
Advantages Of The COD sensor
- Consumables are not required during the measurement process
- Can measure COD, TOC, turbidity, temperature and other parameters
- Use two light sources, 254nm and 365nm UV reference light
- Automatically eliminate the interference of suspended solids and compensate for the interference of turbidity
- Excellent test performance, achieve more stable and reliable measurement values
- Integrated self-cleaning brush, small size and convenient to install, continuously monitor water quality online to prevent biological attachment and effectively reduce the frequency of maintenance.
- Digital sensor, RS-485 output, support MODBUS.
- Drop-in installation, the tested sample does not need to be digested, the analysis speed is fast, no reagents need to be added, and there is no special sampling equipment.
- The measurement process responds quickly in real-time without waiting.
Applications Of The COD sensor
- Monitoring for compliance
- Optimization of wastewater treatment processes
- Development of process control algorithms
- Identification of cross-connected sewers
- Identification of pollution sources
- Rapid assessment of incident severity
- Advanced treatment monitoring & protection
- Effluent pollution
Technical Parameters
| Product Name | Chemical Oxygen Demand (COD) Sensor |
| Product Model | CODuv351 |
| Measuring Principle | UV254 ultraviolet absorption method |
| Measuring Range(COD) | 0.75~370mg/L |
| Resolution(COD) | 0.01mg/L |
| Accuracy(COD) | ±2% or ±2.5mg/L, take the larger one |
| Measuring Range(TOC) | 0.3 ~150mg/L |
| Accuracy(TOC) | ±2% or ±2.5mg/L, take the larger one |
| Resolution(TOC) | 0.1mg/L |
| Measuring Range(TU) | 0-300 NTU |
| Accuracy(TU) | 3% or 0.2NTU, take the larger one |
| Resolution(TU) | 0.1NTU |
| Operating Temperature | +5 ~ 45℃ |
| Calibration | 2-point calibration |
| Protection Grade | IP68 |
| Working Pressure | 1Bar |
| Response Time | T90 max. 10s |
| Flow Rate | < 3 m/s |
| Cleaning Method | Rubber scraper |
| Power | 12V 15mA (normal), 200mA (maximum, when cleaning) |
| Output | RS485, Modbus RTU protocol |
| Dimension | Diameter 50mm, length 215mm |
| Cable Length | 10m(custom) |
| Shell Material | POM and 316L |
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RS485 1Bar Chemical Oxygen Demand Sensor IP68 Images
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