Intelligent standard COD digester COD analyzer

KHCOD-8KtypeintelligencestandardCOD消解器It is mainly used in the pretreatment process of water quality chemical oxygen demand determination,Following the basic principles of ISO and GB standards, the digestion operation with reflux heating and micro boiling for 2 hours is ensured. The preparation and addition of reagent solutions are consistent with the GB method, ensuring reliable and accurate analysis results.

The instrument adoptsTouch screen intelligent control systemconductintelligenceHeating control, can be used separately or simultaneously for 8 conical flask reflux devicesconstant temperatureAchieve energy conservationenvironment protectionThe purpose of improving efficiency.

Compared to existing digestion instruments in the market, this instrument 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.

lAdopting 8-channel independent temperature measurement and constant temperature to ensure the accuracy and reliability of experimental results.

l8 channels can be started with one click or switched independently. One channel is damaged, while the other channels are still usable.sectioncan, safe and reliable.

ladoptTouch screen intelligent control system, operators can conduct experiments through touch screen operation, which is convenient to use, easy to operate, and displays intuitively，Improved the work efficiency of operators.

lintelligent systemHaving data recordsAnd viewFunction,automaticrecordprocessdataCan view historical datacurveAnd alarm information, truly realizingUnattendedEnsure the validity of the experimental results.

IITechnical Specifications

Measurement range: 10-700mg/L (tested after dilution of water samples greater than 700mg/L)

Measurement time: 1 minute to 999 minutes (users can choose their own heating time)

Measurement error: Potassium hydrogen phthalate standard solution (500mg/L), relative standard deviation not exceeding 5.0%

Industrial organic wastewater (500mg/L), with a relative standard deviation of no more than 8.0%

Environmental temperature: 5-35℃

Temperature setting range: 0~260℃

Dissolve 8 samples (using a 250ml conical flask with 24 # grinding mouth, users can choose to open or close each one independently)

Heating power:big2000W （AV220V，50Hz），Users can choose independently

Instrument size: 445mm (length) * 335mm (width) * 700mm (height)

Instrument usage steps

Before starting the operation of the instrument, fill the cooling water inlet above the condenser tube with distilled water to ensure the cooling effect in the experiment.

• Turn on the power switch on the right side of the instrument, and the touch screen on the instrument will display the surface temperature of the 8 conical bottle positions on the heating plate, as well as the set temperature and time.
• According to the experimental requirements, set the heating time and temperature.
• According to the experimental requirements, select the channel that needs to be heated. press“Total startup”Turn on all heating or heat channels as needed“start”Turn on the heating, the cooling fan is turned on, and the heating indicator light is on, as shown in Figure 7. When the operation ends, the instrument stops heating and the cooling fan is turned on. When the temperature drops to 50Turn off the fan at ℃.

Note: During the experiment, the multi-channel or single channel digestion control can be stopped according to the situation by pressing "total stop" or "stop" as needed.

Sample processing and analysis methods refer to national standard analysis methodsHJ828-2017When using this instrument to analyze a sample with a COD concentration greater than 50mg/L, the specific steps are as follows:Take 10.0 ml of water sample into a conical flask, add 5.00 ml of mercuric sulfate solution (6.11), potassium dichromate standard solution (6.9.2), and several explosion-proof boiling glass beads (6.15) in sequence, and shake well. Mercury sulfate solution (6.11) is added in a mass ratio of m [HgSO4]: m [Cl -] ≥ 20:1, with a large amount of 2 ml.

Connect the conical flask to the lower end of the condenser tube of the reflux device (7.1), slowly add 15ml of silver sulfate sulfuric acid solution (6.10) from the upper end of the condenser tube to prevent the escape of low boiling point organic matter, and continuously rotate the conical flask to mix it evenly. Press the "General Start" button, and the instrument will start digesting and heating the liquid according to the set time and temperature; After setting the heating time, the instrument stops heating and the time displays "OFF"; After cooling, the fan stops rotating and maintains a slight boiling reflux for 2 hours from the beginning of the solution boiling. After reflux cooling, add 45 ml of water from the upper end of the condenser tube to rinse the condenser tube, making the solution volume around 70 ml, and remove the conical flask. After cooling the solution to room temperature, add 3 drops of ferrous indicator solution (6.14) and titrate with ammonium ferrous sulfate standard solution (6.12.2). The color of the solution changes from yellow to reddish brown, which is the endpoint. Record the consumption of ferrous sulfate.