● The water inlet and the water outlet of sewage treatment plant and tap water factory
● Sewage outfall of each enterprise
● Lake and river water quality monitoring station
Water,potassium dichromate digestion solution, silver sulfate solution (silversulfate as catalyst can be effectively oxidized straight chain fattycompounds), and the mixture of concentrated sulfuric acid heated to 165 ℃,organic dichromate ion oxidation in the solution after the color change, changethe color of the analysis instrument, and this kind of change convert COD valueoutput. The amount of consumption of the equivalent ion dichromate oxidation oforganic matter. The measurement process is the main interference of chlorideion and chloride, by adding sulfuric acid in water to remove the interference ofmercury.
● Using the national standard (GB11914-89) regulation method of dichromate method, high precision and good stability, which has good correlation with manual analysis;
● Unique structural design with lower failure rate, lower maintenance, lower reagent consumption and higher cost performance;
● The instrument has strong ability to resist the interference of chloride ions, can directly detect the chloride ion content of 10000mg/L water samples;
● A unique valve assembly, multiple channel flexible switch, the equipment has the advantages of easy maintenance, long service life etc.;
● Optical system to achieve precise accurate measurement of reagent peristaltic pump, pump, overcome due to quantitative error caused by abrasion, while achieving a precise quantitative trace reagent, greatly reducing the using amount of reagent;
● The closed high temperature and high pressure digestion system not only speeds up the reaction process, but also overcomes the corrosion of the corrosive gas volatilization of the other similar devices;
● Power down data protection to ensure that the instrument system data is not damaged and the data record will not be lost;
● A variety of signal output interface to meet a variety of access requirements;
● Have exceed the standard alarm function, and with the use of samplers, can exceed the standard sample;
● With network functions, through the network platform, data sharing and remote control can be achieved;
● Equipped with a micro printer to facilitate data permanent preservation.
Measurement performance
● Measurement range: 0 ～ 200mg/L;0 ～ 600mg/L;0～1200mg/L; According to user requirements can be extended to 5000mg/L
● Accuracy: ±3mg/L(COD＜30mg/L); ±10%（30mg/L≤COD＜100mg/L;
±8%（COD ≥ 100mg/L）
● detection limit: 3mg/L
● Zero drift: ±5mg/L
● Range drift: + 5% F.S.
● Measurement cycle: minimum measurement cycle of 25 min
● Calibration: online automatic calibration function
● Automatic cleaning: after each measurement, the instrument can automatically clean the pipe
● Reagent consumption: 0.65 ~ 2.6 ml / min / reagent
● Data storage: 500 thousand historical data storage (more than ten years’ full data record)
● Data protection: abnormal alarm and power failure will not lose data
● Display: touch screen displays and command input
Output
● Output interface: Standard: RS232/RS485, two 4-20mA;
Optional: wireless internet interface, linkage control interface
Power supply
● AC power supply: 220±22vAC, 50± 2.5Hz
● Instrument power: daily 50W; peak time <300W
Physic properties
● Size: 420×600×250mm
Environmental performance
● Environmental requirements: 0℃~ 40 ℃, relative humidity is less than 90%, no condensation
● External water samples: pressure: -10 ~ +2KPa; flow rate: -1.0 ~ 0.5m/s; temperature: 5 ~ 40
