- Material: :
COD Online Analyzer/ COD Online Meter, Water Analyzer, Sewage Water Treatment, Waste Water Treatment
COD is an important indicator to reflect the extent of water pollution ,which is polluted by the organism and inorganic reducing substances.
COD means under certain conditions, mass concentration of oxygen consumption, when use strong oxidizer, make organism and inorganic reducing substances oxidation. This analyzer can automatic continuous work for long-term in an unattended manner. And it is widely used in industrial pollution discharge wastewater, industrial process wastewater, industrial wastewater treatment plants, municipal wastewater treatment plants and so on. Depending on the complexity at the scene, for ensure reliable and accurate testing, can choose different pre-treatment system.
Water sample, potassium dichromate digestion solution, silver sulfate solution( Silver sulfate added as a catalyst can oxidize straight-chain aliphatic compounds more effectively), the sulfuric acid mixed and heated to 175℃. The color of the organics in the dichromate ions oxide solution will change. The analyzer detects the change of color, converts and outputs the COD value. The consumption of dichromate ions is equivalent to the consumption of oxidizable organic, that is COD.
Suitable for the wastewater, whose chemical oxygen demand within 10~5000mg/L and chloride concentration less than 2.5g/L Cl. According to actual customer demand, it can also be suitable to the wastewater, whose chloride concentration less than 20g/L Cl.
High temperature digestion of potassium dichromate, Colorimetry
Lower limit of detection
±10% Or ±8mg/L（choose larger value of them）
10% Or 6mg/L（choose larger value of them）
Null point drift
Minimum test cycle is 20min, According to the actual water samples, digestion time range: 5~120min.
Time interval(adjustable),whole point and trigger measurement mode to choose.
Auto calibration (adjustable from 1~99 days), manually calibrate according to the actual water samples.
Maintenance intervals longer than 1 month, 30min everytime
Average less than 0.05 USD/sample
Touch screen display and command input
Self-diagnostic of work condition, data storage when abnormal or power off, Abnormal reset or power on, machine exclude residual reactants and return to work automatically
Not less than six months of data storage
2-way RS232 digital output, 1-way 4~20mA analog output
Indoor work, recommended temperature is 5~28℃, humidity≤90%（non-condensing）
Size(L x W x H)