COD analyzer

1.Principle of COD analyzer

COD Analyzer uses potassium dichromate digestion at high temperature to measure continuous online chemical oxygen demand (COD).A quantitative amount of potassium dichromate solution is added to the sample. In a strong acidic medium, silver sulfate is used as a catalyst. The chloride ion concentration is reduced by a unique dilution injection technique, and a combined masking agent is used to mask high-concentration chloride ions. After high-temperature and high-pressure digestion, the COD concentration value is determined by spectrophotometry.

2. Product Features of COD analyzer

The new photoelectric quantitative technology is not affected by interference such as large chromaticity, large amounts of suspended matter, and large amounts of bubbles. It has high reliability and accuracy and strong anti-interference ability.

High detection accuracy, low measurement limit and small long-term drift of the instrument.

It has one-button self-test function and self-diagnosis function.

Adopt single-channel highly integrated valve group, maintenance and cleaning are simple and quick.

All-weather networking function, monitor the instrument operation status anytime and anywhere.

It has alarm function, quality control function and reverse control function.

It has automatic cleaning and automatic calibration functions.

It has functions of hourly measurement, interval measurement and external control measurement.

It will work automatically after power failure.

Automatic prompt and automatic reset function for fault and reagent (sample) shortage.

With fault recording function.

Can save historical data for more than 3 years.

Meet the requirement of separate discharge of cleaning liquid and waste liquid

3. Technical Parameters of COD analyzer

Measurement method: According to standard HJ828-2017 "Water quality-Determination of chemical oxygen demand-Dichromate method"

Measuring range: 0-200 mg/L; 0-500 mg/L; 0-1000 mg/L; range can be customized

Indication error: ≤±3% Detection limit: 10mg/L

Repeatability: ≤±3% Waste volume: 6mL/time

Memory effect: ≤±3% Actual water sample comparison: ±8%

Constant temperature time: 900 seconds Voltage stability: ≤±5%

Measurement cycle: 39 minutes Calibration cycle: any specified time

Maintenance cycle: ≥720h/time Maintenance workload: <2 hours/month

Reagent consumption: 3 months/500ml Display output: Equipped with 10.1-inch color LCD touch screen

Color development temperature: recommended temperature is 165℃, can be set according to the actual water sample conditions

Data export: The measured values can be imported into a USB flash drive and saved via the USB port

Signal output: RS485/RS232/USB interface/standard 2-way 4-20mA output/standard 2-way switch input and output

Environmental requirements: Temperature-controlled indoor environment, recommended temperature (5-28°C), humidity ≤ 90% (no condensation)

Power supply and power: (220V±22)V/AC, (50±0.5Hz), 5A, 150W

Instrument size: upper cabinet 600*450*300mm; upper cabinet 700*450*300mm

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