cod monitor

1.Principle of COD monitor

The principle of the cod monitor is that a mixture of water sample, potassium dichromate digestion solution, silver sulfate solution (silver sulfate is added as a catalyst to more effectively oxidize linear fatty compounds), and mercury sulfate solution is heated to 165°C, dichromium The color changes when acid ions oxidize organic matter in the solution. Add a certain amount of potassium dichromate solution to the sample, use silver sulfate as a catalyst in a strong acidic medium, use a unique dilution injection technology to reduce the chloride ion concentration, and use a joint masking agent to mask high-concentration chloride ions. After digestion, the COD concentration value was determined using spectrophotometry.

2. Product features of COD monitor

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

The detection accuracy is high, the lower limit of measurement is low, and the long-term drift of the instrument is small.

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

Using a single-channel highly integrated valve group, maintenance and cleaning are simple and fast.

All-weather networking function allows you to monitor the operating status of the instrument anytime and anywhere.

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

Equipped with automatic cleaning function and automatic calibration function.

Equipped with whole point measurement, interval measurement and external control measurement.

It will work automatically after power failure and recovery.

Automatic prompts and automatic reset functions for faults and lack of reagents (samples).

With fault recording function.

Can save more than 3 years of historical data.

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

3. Technical parameters of COD monitor

Measurement method: According to the standard HJ828-2017 "Water Quality-Chemical Oxygen Consumption Determination-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 liquid volume: 6mL/time

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

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

Measurement period: 39 minutes Calibration period: 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 temperature: The recommended temperature is 165°C, which can be set according to the actual water sample conditions

Data export: Measured values can be imported into a U disk and saved through the USB port.

Signal output: RS485/RS232/USB interface/standard configuration: 2 channels of 4-20mA output/standard configuration of two channels of switching input and output

Environmental requirements: Temperature-controlled indoors, 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