Fundamental
The sample was added with quantitative potassium dichromate solution. In the strong sulfuric acid medium, silver sulfate was used as the catalyst and mercuric chloride was added as the chloride ion masking agent. After the mixture was digested by high temperature and high pressure at 165 ℃, the hexavalent chromium Into the trivalent chromium, the color of the mixture changes, with the spectrophotometric determination of the color changes, to calculate the actual COD value, the amount of dichromic acid consumed equivalent to the amount of organic matter can be oxidized.
Performance parameters
Methods of measurement: potassium dichromate spectrophotometric method
Measuring range: 30.0 ~ 1000.0mg / L (according to customer needs to expand range)
Indication error: ≤ ± 5%
Zero drift: ≤ ± 5mg / L
Range drift: ≤ ± 5%
Repeatability: ≤ ± 3%
High and low temperature environmental impact: ≤ ± 5%
Memory effect: ≤ ± 5mg / L
Measurement period: minimum measurement period 30min
MTBF: ≥1440 hours
Power supply: 220VAC ± 10%; 50Hz ± 5%
Volume: 1600mm × 500mm × 420mm
Interface: RS232 / RS485, 4 ~ 20mA input / output, switch input × 2, switch output × 2
Instrument features
Using HJ / T399-2007 “water quality – chemical oxygen demand determination – rapid digestion spectrophotometry”, the industry recognized a high degree;
Unique three-level precision photoelectric metering device, reagent extraction quickly and accurately, significantly reduce the impact of peristaltic pump tube aging;
Accurate temperature compensation algorithm and environmental light elimination measures, regardless of spring, summer, autumn and winter, the accuracy is always the same;
Applications : measurement, environmental, water, sulfuric acid
Interface : RS-485, RS-232
Other characteristics : automatic, online
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