Technical Specifications

1. Method basis: Determination of chemical oxygen demand—Dichromate method.

2. Measurement range: 10–5000 mg/L COD.

3. Accuracy: When ≥100 mg/L, not exceeding ±10%; when <100 mg/L, not exceeding ±8 mg/L.

4. Repeatability: When ≥100 mg/L, not exceeding ±10%; when <100 mg/L, not exceeding ±6 mg/L.

5. Measurement cycle: The minimum measurement cycle is 20 minutes; depending on the characteristics of the actual water sample, the digestion time can be adjusted within the range of 5 to 120 minutes.

6. Sampling period: adjustable time interval (10–9,999 minutes) and on-the-hour measurement mode.

7. Calibration interval: Adjustable at any interval between 1 and 99 days, with the option to set the timing arbitrarily.

8. Maintenance Schedule: Typically once a month, with each session lasting approximately 30 minutes.

9. Reagent consumption: less than 0.4 yuan per sample.

10. Output: RS-232, 4–20 mA (optional).

11. Environmental Requirements: Indoor environment with adjustable temperature; recommended temperature range: +5 to 28°C; relative humidity ≤ 90% (no condensation).

12. Power supply: AC 220±10% V, 50±10% Hz, 5 A.