Method: resorcinol spectrophotometry;

Measuring range: 0.0 ～10mg/L, 0.5～100 mg/L, 5～500 mg/L;

Indication error: ≤±10% when ≥0.5 mg/L;  ≤ ±0.05 mg/L when <0.5 mg/L

Repeatability: ≤±5%;

Stability: ≤±10% in 24h;

Measurement period: The minimum measurement period is 30 min, and the digestion time can be arbitrarily modified from 5 min to 120 min;

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

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

Maintenance cycle: generally once a month, about 30 minutes each time;

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

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

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

Dimensions: 1570 ×500 ×450 (mm)

· The unique design makes this product have lower failure rate, lower maintenance, lower reagent consumption and higher cost performance than similar products.

· Select valve components: select reagent sampling timing.

· Metering components: The accurate metering of reagents is achieved through the visual photoelectric system, which overcomes the quantitative error caused by the wear of the peristaltic pump tube; at the same time, the accurate quantification of trace reagents is realized, each dose is only 1.5 ml, which greatly reduces the amount of reagents used.

· Sampling components: negative pressure suction by the peristaltic pump, there is always an air buffer between the reagent and the pump tube, which avoids the corrosion of the pump tube.

· Sealed digestion components: high temperature and high pressure digestion system speeds up the reaction process and overcomes the corrosion of equipment caused by the volatilization of corrosive gases in the open system.

· Reagent tube: Imported modified PTFE transparent hose with a diameter greater than 1.5 mm, which reduces the chance of water sample particle blockage.

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.