COD digester quotation

SH-100 type 6-holeStandard COD digester

National HJ828-2017 standard

The analytical method standardizes the determination steps of chemical oxygen demand (COD) (Cr) for water quality, and strictly specifies the conditions and indicators such as heating digestion time, solution acidity, oxidant and catalyst dosage for the method. It is obvious that the determination of COD (Cr) in water quality has strict conditions, and any operation that violates these conditions will affect the accuracy of the determination.

The COD (Cr) constant temperature heater follows the basic principles of international standards (ISO) and national standards (GB), ensuring the digestion operation of reflux heating and micro boiling for 2 hours. The preparation and addition of reagent solution are consistent with the GB method, ensuring reliable and accurate analysis results.

The instrument adopts microcomputer technology for timed control of the heating electric furnace, which can simultaneously heat six 250ml triangular flasks. To achieve the goals of energy conservation, reducing power load, and improving efficiency.

The instrument adopts a glass burr reflux tube instead of a spherical reflux tube, and uses air cooling technology instead of tap water cooling, which can save water and standardize the instrument.

The chemical solution preparation, operation, and COD calculation of the instrument shall be in accordance with

National HJ828-2017 standard

For COD water samples below 50mg/L, the accuracy can be improved by diluting the titrant and oxidant. For COD water samples above 1000mg/L, the measurement can be completed by diluting the water sample proportionally.

SH-100 type 6-holeStandard COD digesterTechnical Specifications

1. Measurement range: 0-1000mg/L, 0-10000mg/L (diluted water sample)

2. Measurement time: no more than 2 hours

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

4. Industrial organic wastewater (500mg/L), with a relative standard deviation not exceeding 8.0%

5. Environmental temperature: 5-40 ℃

6. Heating power: about 1500W (AC 220V ± 22V, 50HZ),

The standard configuration of the instrument includes one main unit, six condenser tubes (reflux tubes), six standard 24 grit 250ML conical bottles, one instruction manual, one warranty card, and one certificate of conformity.