- Seen : 242 View
Product overview: chemical oxygen demand (COD) refers to the oxygen mass concentration of oxidants consumed when oxidizing organic and inorganic reducing substances in water samples with strong oxidants under certain conditions. COD is also an important indicator to reflect the degree of pollution of water by organic and inorganic reducing substances.
The monitor can work continuously and automatically according to the setting of the site, and it is widely used in the discharge of wastewater from industrial pollution sources, industrial process wastewater, industrial sewage treatment plants, municipal sewage treatment plants, etc.According to the complexity of the field test conditions, the corresponding pretreatment system can be selected to ensure the reliability of the test process and the accuracy of the test results, so as to fully meet the requirements of the field in different occasions.
The product principle
Water, potassium dichromate digestion solution, silver sulfate solution (silver sulfate as a catalyst to join can more effectively straight-chain fatty compound oxide) and sulfuric acid mixture is heated to 165 ℃, dichromate ion oxide solution of organic matter after color change, monitor to detect the changes in color, and the conversion this change into COD value of output, consumption amount of dichromate ion equivalent of oxidizable organic matter content, namely, COD.
Technical specifications
Specification name technical parameters
Scope of application: this product is suitable for wastewater with chemical oxygen demand in the range of 10~5000mg/L and chloride concentration below 2.5g/L Cl-. It can be extended to wastewater with chloride concentration below 20g/L Cl- according to customers' actual demand
Methods potassium dichromate was digested at high temperature and colorimetric determination was performed
The measuring range is 10~5000mg/L
Detection limit 3
Resolution of 0.1
Accuracy ±10% or ±8mg/L (the larger of the two)
Repeatability 10% or 6mg/L (the larger of the two)
Zero drift ±5mg/L
Range drift ±10%
The minimum measurement cycle is 20min. The digestion time can be set from 5 to 120min according to the actual water sample
Sampling cycle time interval (adjustable), hour point or trigger measurement mode can be set
Calibration period: automatic calibration (1~99 days adjustable), manual calibration can be set according to the actual water sample
Maintenance cycle the maintenance interval is longer than 1 month, about 30min each time
Man-machine operation touch screen display and command input
Self-check to protect the working status of the instrument self-diagnosis, abnormal or power will not lose data;After abnormal reset or power failure, the instrument automatically removes the residual reactant and automatically resumes operation
Data storage not less than half a year data storage
Input interface switching quantity
Output interface: 2-channel RS232 digital output, 1-channel 4-20ma analog output
Working environment indoor work, recommended temperature 5~28℃, humidity ≤90% (no condensation)
Power and power consumption AC230±10%V, 50~60Hz, 5A
Size height 1500× width 550× depth 450 (mm)
Saler Company Information
