On-line COD Analyzer
Detection Principle
Add a known amount of potassium dichromate solution to the water sample, and use silver salt as a catalyst and mercury sulfate as a masking agent in a strong acid medium. After high-temperature and high-pressure digestion reaction, detect the absorbance of the product at a specific wavelength. According to Lambert Beer's law, there is a linear correlation between the chemical oxygen demand content in water and the absorbance, and then determine the concentration of chemical oxygen demand in water.Note: There are difficult to oxidize substances such as aromatic hydrocarbons and pyridine in the water sample, and the digestion time can be appropriately extended.
TECHNICAL PARAMETERS
| Model | AME-3000 |
| Parameter | COD (Chemical oxygen demand) |
| Measuring Range | 0-100mg/L、0-200mg/L and 0-1000mg/L, Three-range automatic switching, expandable |
| Test Period | ≤45min |
| Indication Error | ±8% or ±4mg/L（Take the smaller one） |
| Limit of quantitation | ≤15mg/L（Indication error: ±30%） |
| Repeatability | ≤3% |
| Low level drift in 24h(30mg/L) | ±4mg/L |
| High level drift in 24h(160mg/L) | ≤5%F.S. |
| Indication error | ±8%or±4mg/L（Take the small one） |
| Memory effect | ±5mg/L |
| Interferrnce of voltage | ±5mg/L |
| Interferrnce of chloridion(2000mg/L) | ±10% |
| Comparison of actual water samples | CODcr＜50mg/L：≤5mg/L |
| CODcr≥50mg/L：±10% | |
| Data availability | ≥90% |
| Conformity | ≥90% |
| Minimum maintenance cycle | ＞168h |
| Power Supply | 220V±10% |
| Product size | 430*300*800mm |
| Communication | Real-time data can be printed on paper.RS232,RS485 digital interface,4-20mA analog output,4-20mA analog input,and multiple switches are available for selection. |
Characteristics
1. The analyzer is miniaturization in size, which is convenient for daily maintenance;
2. High-precision photoelectric metering and detection technology are used to adapt to various complex water bodies;
3.Three ranges (0-100mg/L), (0-200mg/L) and (0-1000mg/L) satisfy most of the water quality monitoring requirements. The range can also be extended according to the actual situation;
4. Fixed-point, periodic, maintenance and other measurement modes satisfy the requirements of measurement frequency;
5.Reduces the operation and maintenance costs by low consumption of reagents;
6. 4-20mA,RS232/RS485andothercommunicationmethodssatisfy the communication requirements;
Applications
This analyzer is mainly used for real-time monitoring of chemical oxygen
demand (CODc r) co
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