Nanjing Juge Environmental Technology Co., Ltd.
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CODmn Permanganate Index Online Water Quality Analyzer
>>Overview
CODMn refers to the mass concentration of oxygen consumed by strong oxidizers under specific conditions to oxidize organic and inorganic reducing substances in water samples. It is a critical indicator of water pollution caused by organic and inorganic reducing agents.
This analyzer operates autonomously under long-term unattended continuous monitoring based on field configurations. It is widely applicable to surface water monitoring and similar scenarios. Depending on the complexity of on-site conditions, optional preprocessing systems can be integrated to ensure reliable testing processes, accurate results, and compliance with diverse operational demands.
>>Features
The CODMn method employs potassium permanganate oxidation spectrophotometry. The sample is heated in a water bath for 20 minutes, during which potassium permanganate oxidizes organic pollutants. The amount of potassium permanganate consumed during this process serves as an indicator of pollutant levels.
>>Technical Parameter
| Test Method |
Potassium permanganate oxidation spectrophotometric method |
| Measuring Range |
0~20mg/L (segmented measurement, expandable) |
| Detection Limit |
0.05mg/L |
| Resolution |
0.001mg/L |
| Accuracy |
±5% |
| Repeatability |
≤±5% |
|
Drift (24h) |
Zero drift: ±0.05mg/L Span drift: ±2% |
| Measurement Time |
Minimum 20min; digestion time adjustable (5~120min) based on actual water samples |
| Measurement Modes |
Adjustable time interval, fixed time point, or triggered measurement |
|
Calibration Modes |
Automatic calibration (1~99 days adjustable) Manual calibration based on actual water samples |
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Maintenance Cycle |
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| Human-Machine Interface |
Touchscreen display and command input |
|
Self-Diagnosis & Protection |
Self-diagnoses operational status; retains data during anomalies/power outages Automatically clears residual reactants and resumes operation after reset/power recovery |
| Data Storage |
5-year data capacity |
| Input Interface |
Digital input |
|
Output Interfaces |
1× RS232, 1× RS485 2× 4~20mA analog outputs |
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Operating Environment |
Indoor use; recommended temperature: 5~28℃, humidity ≤90% (non-condensing) |
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Power Supply |
Voltage: AC 220±10% V Frequency: 50±0.5 Hz Power: ≤150W (excluding sampling pump) |
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Dimensions |
520H × 370W × 265D (mm) |