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Conventional Pollution Online Monitoring Instrument
COD Online Analyzer
product details

Product Model: COD-8000


System Overview


Cr (VI) in the mixed solution formed by water sample, potassium dichromate, silver sulfate (as a catalyst to oxidize the straight chain aliphatic compounds more fully) and concentrated sulfuric acid is reduced to Cr (III) under high temperature and high pressure environment, so that the color of the mixture solution changes. The degree of change of the color of the solution corresponds to the solubility of COD (chemical oxygen demand) of the measured water sample. The instrument can directly determine the COD value of the water sample by photoelectric colorimetry. Chlorine ions in water samples are the main interfering substances, and the COD-8000 COD (Chemical oxygen demand) online analyzer can eliminate the interference of chlorine ions by adding mercury chloride (HgCl₂) to the water samples.


Measuring Method


potassium dichromate digestion at high temperature, colorimetric determination.


Technical parameters


Test range: 0-100/1000/30000mg/L;
Accuracy: 10%;
Repeatability: 5%;
Corresponding time (>90%): automatic judgment, minimum 6 minutes;
Reagent consumption: No more than 2ml per measurement;
Testing methods: timed, equally spaced, manual;
Data transmission methods: RS232, RS485, RPRS;
Display: 8-inch color touch screen with a resolution of 800 * 600;
Data storage: valid data for five years;
Working temperature: +0 ℃~+40 ℃;
Power supply: 200V AC±10%/50-60Hz;
Power consumption: Approximately 100W;
Size: 530×1340×390mm;
Weight: Approximately 45KG;


System Features


· Maintenance Free Design

The water sample pre-treatment device adopts a maintenance free design, which can ensure that the maintenance cycle of the pre-treatment device exceeds six months;


· Chemical Digestion Time Can Be Adjusted

The chemical digestion time can be adjusted, and the measurement process and results meet relevant standards;


· Adjustable Quantitative Sampling Device

Ensure that the instrument accurately measures various water samples by adjusting the reagent dosage and sampling amount;


· Non Contact Injection Pump

The use of reagents adopts a non-contact injection pump to avoid direct corrosion of the reagent pump, which can extend the service life of core components and reduce user usage costs;


· All Imported Devices

The analysis of flow path design and reagent formulation ensures measurement reproducibility, with a current measurement reproducibility of up to 5%;


· Fully Automatic Operation

No need for personnel on duty, it can achieve intelligent functions such as automatic zero adjustment, automatic calibration, automatic measurement, automatic cleaning, automatic maintenance, self-protection, and automatic recovery;


· Diversified Online Monitoring Methods

It can achieve measurement methods such as manual measurement at any time, automatic timed measurement, and automatic periodic measurement;


· Leakage Reminder Function

When there is a reagent leak, the instrument automatically prompts the user to perform maintenance.