B-8C National Standard COD Reflux Digestion InstrumentThe device is completely in accordance with the standards issued 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.

This instrument adopts microcomputer technology for timing control heating mode, and can be optionally used forSimultaneously heating 8 straight large mouthed bottles using a full glass reflux device; 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.

Preparation and operation of chemical solutions for instrumentsThe calculation of COD fully complies with the national standardHJ 828—2017Note: ForWhen measuring 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 made to the national standardHJ 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
Using microcrystalline heating panel and infrared heating method, the heating speed is fast and uniform, and the service life is longer
After the digestion is completed, the instrument will automatically sound a warning and stop heating work
※ Water 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

※ Sample size for digestion: 8 per batch

※ Dissolution time:Users can set their own time according to their needs,1-999 minutes

※Fan settings: automatic/Manual

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