Online COD analyzer, CODG-3000


BOQU Instrument is global manufacturer in water quality analyzer ,water quality sensor, and solutions for industrial water treatment projects. We provide water measurement solutions for  COD,BOD,Ammonia nitrogen ,total nitrogen,total phosphorus,nitrate,nitrate nitrogen,chlorophyll,blue-green algae,chloride,fluoride,oil-in-water,Total Nickel,Total Zinc,Total Copper,Total Lead,Total Iron and other heavy metals etc.Our customers come from various industries, such as chemical, food & beverage, life sciences, power & energy, primaries & metal, oil & gas and water & wastewater and so on.

#Online COD Analyzer CODG-3000


#online cod analyzer CODG-3000


# Online COD Analyzer

CODG-3000 Online COD Analyzer use principle of the potassium dichromate method for measuring COD: the water sample, potassium dichromate, silver sulfate solution (the catalyst oxidizes the linear aromatic hydrocarbon compound more fully) and concentrated sulfuric acid are heated to 175 ° C in the digestion tank. During this period, the chromium ion is reduced as the oxidant from the VI valence to the III valence and the color is changed. The degree of color change corresponds to the content of the organic compound in the sample, and the instrument directly displays the COD of the sample by colorimetric conversion. The main interference of CODG-3000 potassium dichromate type Online COD Analyzer for wastewater cod detection is chloride, which can be removed by adding mercury sulfate to form a complex.

Technical parameter

Product CODG-3000 Online COD Analyzer
Standard Water Quality- Chemical oxygen demand Measurement- Potassium dichromate
Measuring range 5-1500 mg/L;100~5000mg/L;500~15000mg/L COD;
Accuracy ≤±10% when ≥100mg/L; ≤±8mg/L when <100mg/L
Repeatability ≤±10% when ≥100mg/L; ≤±6mg/L when <100mg/L
Value error ≤±10% when ≥100mg/L; ≤±6mg/L when <100mg/L
Measurement period The minimum measurement period is 35 minutes, according to the actual water sample, The digestion time can be modified from 10 to 120 minutes.
Sampling period Time interval(55~9999min adjustable by yourself) and

Integral time measurement mode;

Calibration period Adjustable in 1~99days;
Maintenance period Usually one time per month and 30 minutes each time
Output 4~20mA( 2 ways) RS232,RS485
Ambient requirement It should be indoor and temperature can be adjustable.The recommend temperature is +5~28℃;humidity≤90%(no dew)
Power AC220±10% V,50±10% Hz,5 A;
Dimension size Height 1450×Width510×Length 450 mm;
Data saved The data can be saved when abnormal alarms and power off.
Display Touch screen and Command Input
Other When Reset after abnormal alarm and power on after off, the instrument automatically discharges residual reactants in the instrument and automatically resumes working status.