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COD online analyzer
COD online analyzer

The instrument is based on the analysis method of the national standard GB11893-89. After the water sample is oxidized and digested with potassium sulfate, the phosphorus containing compounds in it are converted into orthophosphate. In acidic media and the presence of antimony salt, orthophosphate reacts with ammonium molybdate to generate phosphomolybdate heteropoly acid, which is then immediately reduced by ascorbic acid to form a blue complex. Detect absorbance through the principle of photoelectric colorimetry, and calculate the concentration of total phosphorus in the water sample.

Instrument characteristics

The humanized design enables this product to have a lower failure rate, lower maintenance, and longer lifespan compared to similar products

Long service life, as well as higher cost-effectiveness and accuracy;

1. Selection of valve components: Adopting independently developed multi way valves, with long service life, easy installation, and easy maintenance and replacement;

2. Measurement component: Use photoelectric signal to judge the liquid concave page, wait for 10 seconds to collect the value when reaching the minimum value;

3. Sample injection component: The peristaltic pump suction is negative pressure, and there is always an air buffer zone between the reagent and the pump tube to avoid corrosion of the pump tube and corrosion of the peristaltic pump hardware in case of pump tube rupture;

4. Reagent tube: Imported modified PTFE transparent hose is used, with an inner diameter greater than 1.6mm, reducing water sample particle blockage

5. Measurement light source: The original imported light source from Germany is used, and the advanced proportional dual optical path system greatly improves the measurement accuracy and resolution of the instrument.


Performance parameters:


measuring method

Ammonium molybdate spectrophotometric method

Digital input

2-way switching value

measuring range

0-100mg/L; Scalable

Analog output

1 circuit 4-20mA

Measurement period


Digital communication


detection limit


working temperature

5 ℃~40 ℃


± 5%


AC 220V, 50Hz





Zero drift

± 5% F.S

Overall dimensions

High 120 × Width 50 × 40cm deep

Span Drift

± 10% F.S


40kg (excluding reagents)

Green environment protection

img3.pngCompany address: No.14 Yixinyuan, Huanshi West Road, Fugui Village, Chengjiang Town, Meixian District, Meizhou City, Guangdong Province

img2.pngContact person: Mr. Dai

img4.pngContact number: 13418980456

img1.pngContact email: 745953437@qq.com

img5.pngCompany official website: www.gdlvjingep.com

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