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- fpi-online@fpi-inc.com
- 459 Qianmo Road, Binjiang District, Hangzhou, China
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The COD online sensor is a dual-beam probe-type intelligent sensor that effectively compensates to reduce turbidity interference. It features a built-in cleaning brush to prevent fouling and bubbles from affecting measurements. The sensor uses an RS485 interface and standard Modbus protocol. Measurement data can be converted to COD, BOD, TOC, and other parameters, enabling rapid response to changes in water quality.
The ultraviolet (UV) absorption spectrum of water correlates well with the presence of organic pollutants. The concentration of organic pollutants absorbs UV light at specific wavelengths following the Lambert-Beer law, which can be expressed as:
Where:
| Product model | UV COD-200 | ||
| Working principle | Dual-wavelength ultraviolet absorption | ||
| Measure the wavelength | 254nm，365nm | ||
| Measurement range | COD：0~100 mg/L | COD：0~200 mg/L | COD：0~500 mg/L |
| Turbidity: 100NTU | Turbidity: 400NTU | Turbidity: 600NTU | |
| turbidity compensation range | 50NTU（0~100mg/L） | 100NTU（0~200mg/L） | 200NTU（0~500mg/L） |
| repeatability | ≤1% | ||
| Measurement accuracy | ≤5%( CODStandard solutionKPH) | ||
| Zero Drift (24h) | ±1%F.S. | ||
| Range drift (24h) | ±3%F.S. | ||
| Detection limit | 1mg/L | ||
| resolution | 0.1mg/L | ||
| Protection level | IP68 | ||
| Communication interface | RS485, the standard Modbus protocol baud rate 9600 address bit default 50 | ||
| Dimensions: | (0~100)mg/L: (φ33*236)mm, cable 10 meters (can be customized) | ||
| (0~200)mg/L: (φ33*226)mm, cable 10 meters (customizable) | |||
| (0~500)mg/L: (φ33*221)mm, cable 10 meters (customizable) | |||
| Material | 316L stainless steel/PVC/titanium alloy optional | ||
| weight | 1kg | ||
| Mounting threads | Upper end NPT3/4 thread | ||
| Operating voltage | （9~36）V DC | ||
| MTBF | ≥1440h/times | ||
| power consumption | 0.9 W (motor brush rotation) 0.4W (motor brush not working) | ||
| Cleaning method: | Mechanical brush | ||
| Calibration period | 1~3 months | ||
| Work environment | （0~50）℃ | ||
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