- Conventional Pollution Online Monitoring Instrument
- Drinking Water Online Monitoring Instrument
- Special Parameter Online Monitoring Instrument
- Heavy Metal Online Monitoring Instrument
- Industrial Process Water Online Monitoring Instrument
- Anodic Stripping Voltammetry Heavy Metal Monitoring Instrument
- Laboratory Online Testing Instrument
- Water Treatment Process Instruments
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
| Measurement methods: | potassium dichromate digestion at high temperature, colorimetric determination; |
| Measuring range: | 0 ~ 100/1,000/30,000mg/L; |
| Accuracy: | 10%; |
| Repeatability: | 5%; |
| Response time (>90%) : | about 30min; |
| Measurement method: | timing, equal interval, manual; |
| MTBF(trouble-free running time) : | ≥720 h/ time; |
| Correction mode: | automatic timing correction or manual correction; |
| Maintenance mode: | Self-maintenance, user maintenance interval >1 month; |
| Sampling inside the instrument: | using injection pump; |
| External sampling: | submersible pump and self-priming pump are provided; |
| Data transmission mode: | 4-20mA; RS232; RS485; |
| Display: | 8-inch color touch screen, resolution is 800X600; |
| Data storage: | one year of valid data; |
| Operating temperature: | + 0℃ ~ +40℃; |
| Power supply: | 220 V AC ± 10% / 50-60 Hz; |
| Power consumption: | about 100W; |
| Size: | 490*1340*375mm; |
| Weight: | about 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.
