• P7111 UV COD Analyzer
  • P7111 UV COD Analyzer
P7111 UV COD Analyzer
P7111 UV COD Analyzer
P7111 UV COD Analyzer
• Based on a 24-bit high-resolution A/D converter
• Automatic sampling analysis and auto-calibration
• Automatic sampling analysis
• No reagent required for the analysis.
• Measuring cycle time adjustable
• Fully isolated I/O design, anti-signal interference and pulse
1x 4-20mA and 1 x RS-485(Modbus)
• Highly stable and accurate with wide measuring range
• 7” LCD color touch panel display
• User-friendly graphical interface
• Available in language of English and Chinese
• User selectable measuring range
• Automatic data storage with capacity up to 5000 historical records.
   (user could expend memory by using 32GB/64GB flash disk)

Operating Principle

The measuring principle is based on the UV light absorption spectrum by unsaturated organic molecules at a specific wavelength. By measuring the sample absorbance in the specific area of the UV spectrum, the online analyzer records the spectral profile of the sample, Turbidity measurements are using a detection angle of 90° (side scatter), where the detector is located in a right angle to the light beam. The method is based upon a comparison of the intensity of light scattered by the sample under defined conditions with the intensity of light scattered by a standard reference suspension. The higher the intensity of scattered light, the higher the turbidity is.


Organic pollutants originate frm domestic sewage (raw or treated), urban run-off, industrial (trade) effluents and farm wastes. Sewage effluents are the greatest source of organic materials discharged to freshwaters. When organic matter increases in a pond, the number of decomposers will increase. These decomposers grow rapidly and use a great deal of oxygen during their growth. This leads to a depletion of oxygen as the decomposition process occurs. A lack of oxygen can kill aquatic organisms. As the aquatic organisms die, they are broken down by decomposers which lead to further depletion of the oxygen levels. Most applications of COD determine the amount of organic pollutants found in surface water (e.g. lakes and rivers) or wastewater, making COD a useful measure of water quality.

P7111 UV COD online analyzer allows to monitor turbidity and pH simultaneously for waste water treatment plants or river monitoring stations with an excellent stability and low operating cost. Advantages of this method are that no reagents are used for the analysis.
General Specifications
Function Direct UV light absorption measurement for COD, BOD (by correlation of COD), TSS, pH, Temperature
Model P7111
Installation Wall mounted or Freestanding
Protection Class IP65
Enclosure • Dimension: H1250* W550* D430mm
• Weight: 20Kgs
• Material: Steel
Range • Chemical Oxygen Demand: 0~200mg, or as per user selective range
• Biochemical Oxygen Demand: 0~200 mg/L 
• Total Suspended Solids: 0~200 mg/L
• pH: 0-14
Accuracy F.S <±5 %
Repeatability <±5 %
Controller Display 7” LCD color touch panel display
Response Time < 60s
Calibration Automatic calibration. Can switch to manual calibration, high- and low- point
Self-Diagnosis The system is continuously self-diagnosis. The error management helps to identify problems. (Display errors and save historical data)
Operating temperature 0~ 50°C
Operating humidity < 95% RH
Sample conditions • Sample temperature: 0 to 45 °C
• Sample flow: Continuous, 50 to 1,000 ml/min
• Suspended solids: 200 microns or less
Communication Outputs • Analog: 4 – 20 mA isolated, RS-485(Modbus)
• Relay: 1 x alarm, 1 x system error
• Digital: RS 485/ Modbus
Electrical Conditions Power supply ranges:115 / 230 VAC, 50 / 60 Hz,<500 Watt
Language Support Chinese, English
• Ambient operating temperature: 0 – 60 °C
• Ambient operating humidity: Up to 95 % RH non-condensing