Total chromium automatic monitoring instrument

Principle of Total Chromium Automatic Monitoring Instrument: In acidic solution, trivalent chromium is oxidized by potassium permanganate to hexavalent chromium. The potassium persulfate oxidation digestion solution and water sample are subjected to high temperature and high pressure, and various nitrogen-containing compounds in the water sample are converted into nitrate through potassium persulfate oxidation digestion. Under acidic conditions, nitrate reacts with a color developer to form a complex, and the total chromium content in the sample is obtained by directly proportional to the color depth and chromium content in the sample.

　

　　Total chromium automatic monitoring instrumentPrinciple: In an acidic solution, trivalent chromium is oxidized by potassium permanganate to hexavalent chromium. The potassium persulfate oxidation digestion solution and water sample are subjected to high temperature and high pressure, and various nitrogen-containing compounds in the water sample are converted into nitrate through potassium persulfate oxidation digestion. Under acidic conditions, nitrate reacts with a color developer to form a complex, and the total chromium content in the sample is obtained by directly proportional to the color depth and chromium content in the sample.

　Technical specifications for total chromium automatic monitoring instrument

Method basis: spectrophotometric detection.

Range: 0-1/5/20mg/L

Measurement offline: ≤ 0.05mg/L (indication error ± 30%)

Zero drift: ≤ 5.0%

Range drift: ≤ 10.0%

Indication error:

The concentration of the standard solution is80% F.Stime	± 5.0%
The concentration of the standard solution is50% F.Stime	± 8.0%
The concentration of the standard solution is20% F.Stime	± 10.0%
Repeatability:≤10%.
memory effect
80%→20%	± 0.3 mg/L
20%→80%	±0.2 mg/L
Linearity:±10.0%.
Actual water sample comparison test
Water sample concentration<0.5 mg/L	≤0.05 mg/L
Water sample concentration≥0.5 mg/L	≤10.0%

Measurement cycle: The minimum measurement cycle is 30 minutes, and according to the actual water sample, the digestion time can be arbitrarily modified within 5-120 minutes.

Sampling period: time interval (adjustable from 10 to 9999 minutes) and whole point measurement mode.

Calibration cycle: 1 to 99 days, adjustable at any interval and time.

Maintenance cycle: usually once a month, about 30 minutes each time.

Output: RS-232, RS-485, 4-20mA (optional).

Environmental requirements: Indoor with adjustable temperature, recommended temperature range of+5-28 ℃; Humidity ≤ 90% (non condensing).

Power supply: AC230 ± 10% V, 50 ± 10% Hz, 5A.