Method: alkaline potassium persulfate digestion ultraviolet spectrophotometry;

Measuring range: 0.10-10.00mg/L 0.1-50mg/L 0.5-100mg/L

                             1.0-300mg/L 5-500mg/L mg/L;

Indication error: ≤0.5mg/L±0.05mg/L; greater than 0.5mg/L, no more than ±10%;

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: AC230±10% V, 50±10% Hz, 5 A;

Dimensions: 1450×510×450 (mm)

In an alkaline medium of 120℃～124℃, potassium persulfate oxidant is added to oxidize ammonia, ammonium salt, nitrite and most of the organic nitrogen compounds in the water sample to nitrate, and then use alkaline in the form of nitrate nitrogen. Potassium persulfate digestion UV spectrophotometric method for the determination of nitrate nitrogen.

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.