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The COD351 series of online digital sensors developed and produced by Daruifuno adopt the principle of UV absorption method and are suitable for online continuous monitoring of water quality chemical oxygen demand values. So why does COD monitoring use 254nm ultraviolet light source? First of all, organic substances containing aromatic rings and unsaturated bonds have characteristic absorption of ultraviolet light of specific wavelengths. The ultraviolet absorption method uses this characteristic of organic matter to determine the concentration of organic matter in water by measuring the ultraviolet absorbance of the sample. Secondly, the measurement light source of the UV absorption COD sensor is usually 254nm UV light because the absorption values of many organic substances are relatively stable at this wavelength. Suspended solids and colloidal substances in the sample will also absorb a certain amount of ultraviolet light, affecting the accuracy of the measurement results. Therefore, in order to compensate for the influence of sample turbidity, the COD sensor adds a beam of ultraviolet light as a reference light source. After the ultraviolet light passes through the sample cell, the measurement light and the reference light are separated by a spectrometer, and measured by the signal detector and the reference detector respectively. After deducting the absorbance deviation caused by interference factors, the UV absorbance of the sample can be calculated.
Features
The digital online COD sensor uses ultraviolet absorption method to measure quickly and stably.
The sensor is equipped with a cleaning brush, which can realize automatic cleaning underwater and requires little maintenance.
Equipped with turbidity compensation function to eliminate the influence of suspended solids in water
Digital RS485 communication supports Modbus communication protocol to facilitate data transmission
Specification
| Model | COD351 |
| Measuring Principle | UV254 ultraviolet absorption method |
| Measuring Range(COD) | COD351L: 0.75~500mg/L COD351H: 1~1500mg/L |
| Resolution(COD) | 0.01mg/L |
| Accuracy(COD) | ±3% or 0.5mg/L |
| Measuring Range(TOC) | COD351L: 0.3~200mg/L COD351H: 0.4~600mg/L |
| Resolution(TOC) | 0.01mg/L |
| Measuring Range(TU) | COD351L: 0~300NTU COD351H: 0~1000NTU |
| Operating Temperature | 0~ 45℃ |
| Protection Grade | IP68 |
| Working Pressure | 1Bar |
| Cleaning Method | Rubber scraper |
| Power | 12~24V DC |
| Output | RS485, Modbus RTU protocol |
| Dimension | Diameter 60mm, length 215mm |
| Cable Length | 10m(custom) |
| Shell Material | 316L |
The working process of the COD sensor is to fill the flowing sample cell with the water sample to be measured. The light source emits strong ultraviolet light through the sample and reaches the semi-transparent mirror to split the beam into two. One light (working beam) is directed to the sample detector. , another light (reference beam) shines on the reference detector. The working wavelengths of the working beam and the reference beam are different, and the water sample absorbs its optical energy differently. By comparing the signals from the two detectors, it is possible to derive the special absorption coefficient, a physical quantity used to measure the total amount of organic contaminants in the water. UV method online COD sensor combined with COD controller can realize fast, accurate and economical COD online monitoring. The application fields of COD sensors include: drinking water, surface water, industrial process water, sewage treatment and other fields. It can be used to continuously monitor the degree of organic pollution in raw water and sewage plant imports and the removal rate of organic matter during the treatment process, as well as the organic content of industrial circulating water pollution level, etc.
Delfino company focuses on the R&D and production of water quality analysis instruments. Our measurement parameters include pH, ORP, conductivity, TDS, salinity, dissolved oxygen, COD, ammonia nitrogen, turbidity, chlorophyll, blue-green algae, residual chlorine, and chlorine dioxide. wait. In addition to ORP sensors, our main products include pH ORP analyzer, conductivity analyzer, turbidity analyzer, COD analyzer, dissolved oxygen analyzer, ammonium analyzer, chlorine analyzer, etc.
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Main Product:
Water Quality Monitor,
PH ORP Controller,
PH ORP Analyzer,
PH Sensor,
Turbidity Sensor,
COD Sensor
