1. Product Overview
The Induskey INK270 is a self-cleaning UV COD sensor based on the principle of ultraviolet (UV) absorption. It requires no reagents, ensures pollution-free operation, and offers a more economical and environmentally friendly solution for continuous water quality monitoring.
Drawing on extensive application experience, this sensor incorporates numerous upgrades and innovations compared to its predecessor, featuring an all-metal 316L stainless steel structure and a more compact design. Equipped with an automatic cleaning device, it automatically compensates for turbidity interference and demonstrates excellent stability even during long-term online water quality monitoring.
The sensor is capable of measuring multiple parameters simultaneously, including COD, TOC, turbidity, and temperature, making it suitable for a wide range of industrial and environmental monitoring applications.
2. Key Features & Advantages
A. Reagent-Free Operation
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Requires no reagents, ensuring pollution-free operation
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More economical and environmentally friendly solution for continuous monitoring
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Eliminates hazardous chemical handling and disposal costs
B. Multi-Parameter Measurement
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Capable of measuring COD, TOC, turbidity, and temperature simultaneously
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Single sensor provides comprehensive water quality data
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Reduces need for multiple separate sensors
C. Automatic Turbidity Compensation
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Features automatic compensation for turbidity interference
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Uses dual-wavelength measurement technology to distinguish between UV absorption by organic compounds and light scattering by suspended particles
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Ensures accurate COD readings even in turbid water conditions
D. Self-Cleaning Mechanism
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Equipped with a self-cleaning brush that automatically removes biofilm and deposits from the optical window
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Effectively prevents microbial adhesion
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Significantly extends maintenance cycle and calibration intervals
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Reduces manual cleaning requirements and downtime
E. Robust Construction
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All-metal 316L stainless steel (Ti) housing for superior durability
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IP68 protection rating for continuous submersion in harsh environments
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Corrosion-resistant design suitable for industrial wastewater and chemical applications
F. Flexible Calibration & Communication
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Includes calibration parameters to facilitate on-site and secondary calibration processes
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RS-485 interface with MODBUS RTU protocol for seamless integration with PLCs, SCADA systems, and data loggers
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Supports configurable device addresses for multi-sensor network deployment
G. Dual Range Options
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INK270-B (Low Range): 0-500 mg/L COD, ideal for clean water and drinking water applications
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INK270-C (High Range): 0-1500 mg/L COD, suitable for industrial wastewater and high-concentration monitoring
H. High Precision
3. Technical Principle
3.1 Ultraviolet Absorption Method
The INK270 employs the ultraviolet (UV) absorption method for COD measurement. Organic compounds in water absorb UV light at specific wavelengths (typically 254nm). The degree of absorption is proportional to the concentration of organic matter in the sample. By measuring the UV absorbance, the sensor calculates the Chemical Oxygen Demand (COD) value.
3.2 Multi-Parameter Detection
The sensor utilizes multiple UV wavelengths to simultaneously measure different parameters:
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COD: Measured at 254nm UV absorption
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TOC: Derived from UV absorption correlation algorithms
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Turbidity: Measured using additional optical channels
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Temperature: Integrated temperature sensor for real-time compensation
3.3 Turbidity Compensation Technology
By using dual-wavelength measurement technology, the sensor can distinguish between:
This ensures accurate COD readings even in turbid water conditions without manual intervention.
3.4 Self-Cleaning Mechanism
The integrated self-cleaning brush system operates automatically to:
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Remove biofilm formation from the optical window
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Clear mineral deposits and particulate buildup
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Maintain measurement accuracy over extended periods
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Significantly reduce maintenance requirements and extend calibration intervals
4. Technical Specifications
| Parameter |
INK270-B (Low Range) |
INK270-C (High Range) |
| Measurement Principle |
Ultraviolet absorption method |
Ultraviolet absorption method |
| COD Range |
0 - 500 mg/L |
0 - 1500 mg/L |
| COD Accuracy |
±5% |
±5% |
| Resolution |
0.01 mg/L |
0.01 mg/L |
| TOC Range |
0 - 180 mg/L |
0 - 600 mg/L |
| Turbidity Range |
0 - 500 NTU |
0 - 500 NTU |
| Temperature Range |
0 - 50°C (32 - 122°F) |
0 - 50°C (32 - 122°F) |
| IP Rating |
IP68 (continuous submersion) |
IP68 (continuous submersion) |
| Sensor Interface |
RS-485, MODBUS RTU protocol |
RS-485, MODBUS RTU protocol |
| Power Consumption |
0.1W (non-wiping), 0.8W (wiping) |
0.1W (non-wiping), 2W (wiping) |
| Suggested Power Supply |
DC 12-24V, ≥1A |
DC 12-24V, ≥1A |
| Sensor Dimensions |
Φ46 mm × 176 mm |
Φ46 mm × 176 mm |
| Cable Length |
10 m (default), customizable |
10 m (default), customizable |
| Housing Material |
316L stainless steel (Ti) |
316L stainless steel (Ti) |
Note: The above technical parameters are measured in laboratory standard liquid conditions. Contact Induskey for the latest specifications.
5. Applications
The INK270 is designed for versatile deployment across multiple industries requiring continuous organic contamination monitoring:
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Wastewater Treatment: Inlet and outlet COD monitoring for municipal and industrial wastewater treatment plants
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Industrial Process Water: Continuous monitoring of organic contamination in manufacturing process water
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Environmental Monitoring: Surface water quality assessment in rivers, lakes, and reservoirs
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Drinking Water: Source water monitoring and treatment process control
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Food & Beverage: Process water quality control in food production facilities
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Chemical Industry: Effluent monitoring and process control in chemical manufacturing
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Power Generation: Cooling water and boiler feed water quality monitoring
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Pharmaceutical: Pure water system monitoring and validation
