KHCOD-8KType Intelligent StandardCODDigesteroverview

Intelligent standardsCODDigesterIt is mainly used in the pre-treatment process of water quality chemical oxygen demand determination, following the standard（ISO）In accordance with national standards（GB）The basic principle ensures reflux heating with slight boiling2The digestion operation for hours, the preparation and addition of reagent solution are all in accordance withGBLaw * ensures reliable and accurate analysis results.

The instrument adopts a touch screen intelligent control system for intelligent heating control, which can8The conical flask reflux device is individually or simultaneously kept at a constant temperature. To achieve the goal of energy conservation, environmental protection, and efficiency improvement.

instrumentCompared to existing digestion instruments in the market, it has the following more prominent features:

lAdopting high-efficiency ceramic heaters, with high efficiency, long lifespan, and easy maintenance and replacement.

lAdopting high-temperature resistant microcrystalline heating panel, it is corrosion-resistant and easy to clean. There are edges around the panel to prevent improper operation and liquid leakage from causing corrosion to other items.

luse8The independent temperature measurement and constant temperature of the channel ensure the accuracy and reliability of the experimental results.

l8The channel can be started with one click or independently switched on and off. One channel is damaged, while the other channels are still usable. Energy saving, safe and reliable.

lAdopting a touch screen intelligent control system, operators can conduct experiments through the touch screen, which is convenient to use, easy to operate, and intuitively displayed, improving the work efficiency of operators.

lThe intelligent system has data recording and viewing functions, automatically recording process data, and can view historical data curves and alarm information, truly achieving unattended operation and ensuring the validity of experimental results.

KHCOD-8KType Intelligent StandardCODDigestertechnical specifications

Measurement range:10-700mg/L(Greater than)700mg/LDiluted water sample for testing

Measurement time:1minute~999Minutes (Users can choose their own heating time)

Measurement error: Potassium hydrogen phthalate standard solution（500mg/L）The relative standard deviation is not greater than5%

Industrial organic wastewater（500mg/L）The relative standard deviation is not greater than8%

Environmental temperature:5~35℃

Temperature setting range:0~260℃

Number of Dissolved Samples:8One (using)24#ground-in250mlCone shaped bottles, users can choose to open and close each one independently

Heating power: high2000W（AV220V，50Hz）Users can choose independently

Instrument size:445mm(Long)*335mm(Width)*700mm(High)

Sample processing and analysis methods refer to national standard analysis methodsHJ828-2017Using this instrument to analyze samplesCODConcentration greater than50mg/LThe specific operation is as follows:take10.0 mlWater sample is placed in a conical flask, and mercury sulfate solution is added sequentially(6.11)Potassium dichromate standard solution(6.9.2)5.00 mlAnd a few explosion-proof boiling glass beads(6.15)Shake well. Mercury sulfate solution(6.11)By quality ratiom[HgSO4]：m[Cl-]≥20:1of Proportional addition, with a large amount added2 ml.

Connect the conical flask to the reflux device(7.1)Slowly add from the top of the condenser tube to the lower end of the condenser tube15mlSilver sulfate-sulfuric acid solution(6.10)To prevent the escape of low boiling point organic compounds, continuously rotate the conical flask to mix them evenly. press“Total startup”Key, the instrument starts to digest and heat the liquid according to the set time and temperature; After setting the heating time, the instrument stops heating and the time is displayed“OFF”After cooling, the fan stops rotating and the solution begins to boil Maintain a slight boiling reflux2 hAfter reflux cooling, add from the upper end of the condenser tube45 mlRinse the condenser tube with water to increase the volume of the solution70 mlLeft and right, remove the conical flask. After cooling the solution to room temperature, add 3 Drip test ferrous indicator solution(6.14)Using ammonium ferrous sulfate standard solution(6.12.2)Titration, the color of the solution changes from yellow to reddish brown from blue-green, which is the endpoint. Record the consumption of ferrous sulfate.