Method: Diphenylcarbazide spectrophotometry

Measuring range: 0.00-3.00 mg/L

Accuracy: ≤±10% when ≥0.2 mg/L;  ≤ ±0.02 mg/L when <0.2 mg/L

Repeatability: ≤±5%;

Stability: ≤±10% within 24h;

Measurement period: The minimum measurement period is 30 minutes,

The color rendering time can be modified arbitrarily within 5～120min

Sampling period: time interval (10～9999min arbitrarily adjustable) and whole point measurement mode;

Calibration cycle: adjustable at any interval from 1 to 99 days;

Output: 4~20mA (2 channels) RS232, RS485;

Environmental requirements: Indoors with adjustable temperature, recommended temperature +5～28℃; humidity ≤90% (no condensation);

Power source: AC220±10% V, 50±10% Hz, 5A;

Dimensions: 1570×500×450(mm)

After the water sample and strong oxidant are mixed and digested, the trivalent chromium is oxidized to hexavalent chromium. In the presence of an acidic environment and the indicator, the hexavalent chromium reacts with the indicator to form a colored complex. The analyzer detects this The color change, and convert this change into the total chromium value output. The amount of colored complexes formed is equivalent to the total amount of chromium.

1. Sampling inspection of large watershed environment.

2. Practical use by laboratory researchers.

3. Monitoring of fishery breeding and breeding environment.

4. Monitoring of sewage outlets of sewage plants.

5. Rivers, lakes, streams, etc.