Principle:
QCOD-2E Chemical Oxygen Demand Analyzer is designed by the principle of catalytic and sealed digestion. Sample is sealed digested by special oxidant and composite catalyst for 10min at 165℃, Potassium dichromate is reduced to trivalent chromium by organic matters in water. The amount of trivalent chromium is measured at 610nm, and then converts it to the consumption of Oxygen concentration. The instrument adopts advanced cold light source, narrow-band wavelength interference and microcomputer automatic data processing, and directly shows the COD (mg/L) concentration of samples.
Technical Parameters: 1. Measuring Range: 5~2000mg/L (can be diluted if exceeds 2000mg/L) 2. Accuracy: 5~100mg/L, Absolute Error ≤ ±5mg/L; 100~2000mg/L, Relative Error ≤ ±5% 3. Repeatability: ≤ ±3% 4. Anti-Chlorine Interference: ≤1200mg/L 5. Temperature Precision: 165℃±1.5℃ 6. Digestion Time: 10min 7. Wavelength: 610nm 8. Optical Stability: absorb shift ≤0.002A /20min 9. Sample quantity: 20/16 10. Power Consumption: 400W 11. Dimensions: Main Unit: 210mm×280mm×190mm Digester: 200mm×240mm×190mm Features: a) Cold and monochromatic light source, excellent optical stability. b) PID automatic temperature control and high precision. c) Two-line LCD, easy to operate. d) Digester and Colorimeter (including main unit) are separated, avoid temperature interfere with the optical part. e) High efficiency, 20 water samples can be digested each time and only need 20 minutes. f) Cuvette can be taken out to thorough clean every time. g) Data protection when power failure.
