6BSeries of national standardsCODThe intelligent reflux digestion device is completely in accordance with the regulations released by the Ministry of Environmental Protection of ChinaHJ 828—2017(Replace)GB 11914-89）Designed based on basic principles, it can effectively ensure the digestion process of reflux micro boiling constant temperature control heating for 2 hours. The preparation and addition amount of reagent solution are consistent withHJ 828—2017Consistent standard requirements can ensure accurate analysis results.

The instrument adopts microcomputer technology for timing control heating method, and can simultaneously heat the all glass reflux device of 250ml conical (straight large grinding mouth) bottles with 6/10/12 grinding ports; To achieve the goals of energy conservation, reducing power load, and improving efficiency.

The instrument uses glass burr reflux tubes instead of spherical reflux tubes, and replaces tap water cooling with air and water cooling technologies, which can save water, reduce storage space, standardize the instrument, and improve the reliability of instrument use; The heating bottom plate adopts a fashionable microcrystalline optical panel design concept, which not only improves the accuracy of sample digestion, but also enhances the beauty of the product.

The chemical solution preparation, operation, and COD calculation of the instrument fully comply with the national standardHJ 828—2017Note: For COD water samples with a concentration of ≤ 50mg/L, the sampling volume can be appropriately increased when the sample concentration is low; For COD water samples with a concentration greater than 50mg/L, the accuracy can be improved by diluting the titrant and oxidant; For COD water samples with a concentration greater than 700mg/L, dilution of the water sample concentration is required to complete the result determination; For water samples with high chloride ion content, reference can be madeHJ 828—Appendix A of 2017Method judgment and determination.

[Functional Features]

❖Dual fan convection cooling, independently controllable, with significant cooling effect
❖Large screen LCD Chinese display, adjustable time and power, users can modify, set, and save on their own
❖Adopting microcrystalline heating panel and infrared heating method, the heating speed is fast and uniform, and the service life is longer
❖After digestion is completed, the instrument automatically sounds a warning and stops heating work
❖Water saving, energy-saving, low thermal radiation, and small space occupation
❖Easy to operate, can effectively reduce costs and improve work efficiency

Technical indicators

●Measurement range: 4-700mg/L, 700-1000mg/L (requires diluted water sample)

●Measurement time:≤ 150 minutes (can be set according to user needs)

●Measurement error: Potassium hydrogen phthalate standard solution (500mg/L), relative standard deviation not exceeding 5.0%, industrial organic wastewater (500mg/L), relative standard deviation not exceeding 8.0%

●Environmental temperature:- 5～40℃

●Display mode: LCD display

●Dissolved samples: 10 per batch

●Dissolving time:Users can set their own time according to their needs, ranging from 1-999 minutes

●Fan settings: automatic/manual

●Heating power: 1200W (AC 220V ± 22V, 50HZ)