1. Product Overview
The Induskey INK225 is a high-performance online turbidity sensor designed for continuous water quality monitoring across various industries. Adopting the 90° light scattering method in compliance with ISO 7027 international standards, the INK225 delivers accurate and reliable turbidity measurements.
The sensor is equipped with custom-designed sapphire optical components, ensuring excellent repeatability and stability. Featuring a compact titanium housing design (Φ22 mm × 175.5 mm), the sensor is easy to install and maintain while demonstrating strong resistance to ambient light interference. Its lightweight titanium construction makes it particularly suitable for field applications in food and beverage, pharmaceuticals, electric power, metallurgy, agriculture, and other sectors requiring precise water quality assessment.
With IP68 protection rating and dual range capability, the INK225 provides versatile performance for both clean water and high-turbidity industrial applications.
2. Key Features & Competitive Advantages
A. ISO 7027 Compliant Measurement
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Adopts the 90° light scattering method in compliance with ISO 7027 international standards for accurate turbidity measurement
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Ensures measurement consistency and regulatory compliance across global markets
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Standardized NTU (Nephelometric Turbidity Units) output
B. Sapphire Optical Components
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Equipped with sapphire optical windows offering exceptional hardness, chemical resistance, and optical clarity
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Customized filters ensure minimal susceptibility to ambient light interference and chromaticity effects
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Provides stable and repeatable measurements in varying environmental conditions
C. Robust Titanium Construction
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IP68-rated titanium housing ensures durability and corrosion resistance in harsh industrial environments
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Lightweight yet strong construction ideal for field applications
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Resistant to chemical attack and suitable for aggressive water samples
D. Flexible Installation Options
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M22×1.5 thread with optional NPT3/4 adapter available for various installation requirements
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Inline/immersion type installation for versatile deployment
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Compact dimensions (Φ22 mm × 175.5 mm) for space-constrained applications
E. Dual Range Capability
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Standard range: 0.1-1000 NTU for typical water quality monitoring
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Optional high range: 0.1-4000 NTU for high-turbidity industrial applications
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±5% or ±0.3 NTU accuracy (whichever is greater)
F. Digital Communication Interface
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Standard RS-485 interface with MODBUS RTU protocol for seamless integration
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Easy integration with SCADA systems, PLCs, data loggers, and remote monitoring platforms
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Supports multiple device addressing for multi-sensor network deployment
G. Maintenance-Free Operation
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Requires no electrolyte, features strong anti-interference capability
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Eliminates the need for frequent maintenance
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Factory calibrated with built-in calibration parameters for direct installation
H. Low Power Consumption
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Energy-efficient design: 0.1W power consumption
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DC 5-24V operation with >50mA current requirement
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Ideal for remote monitoring and battery/solar-powered installations
I. Flexible Calibration
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Supports zero point, one-point or two-point calibration
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Factory calibrated prior to delivery for immediate deployment
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On-site calibration capability for long-term accuracy maintenance
3. Technical Principle
3.1 90° Light Scattering Method (ISO 7027)
The INK225 employs the 90° light scattering method in compliance with ISO 7027 international standards for turbidity measurement. A light source illuminates the sample, and a photodetector positioned at 90° to the incident light measures the scattered light intensity. The intensity of scattered light is proportional to the turbidity of the sample, allowing for accurate NTU (Nephelometric Turbidity Units) determination.
3.2 Sapphire Optical Components
The sensor is equipped with custom-designed sapphire optical windows that offer:
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Exceptional hardness: Resistant to scratching and abrasion
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Chemical resistance: Suitable for aggressive water samples
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Optical clarity: Minimal light absorption for accurate measurement
Combined with customized filters, these components ensure minimal susceptibility to ambient light interference and chromaticity effects, providing stable and repeatable measurements.
3.3 Signal Processing
The sensor integrates advanced signal conditioning electronics that process the photodetector output:
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Raw signals are amplified, filtered, and digitized onboard
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Minimizes noise interference at the measurement point
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Digital output ensures signal integrity over the RS-485 communication line
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Eliminates analog signal degradation common in traditional systems
3.4 Communication Protocol
The INK225 communicates via standard RS-485 serial interface using the MODBUS RTU protocol. This industry-standard communication method enables easy integration with existing industrial control systems, data loggers, and remote monitoring platforms. The protocol supports multiple device addressing for multi-sensor network deployment.
4. Technical Specifications
| Parameter |
Specification |
| Model |
INK225 |
| Measurement Principle |
90° light scattering method (ISO 7027) |
| Turbidity Measurement Range |
0.1-1000 NTU (standard) / 0.1-4000 NTU (optional) |
| Turbidity Accuracy |
±5% or ±0.3 NTU (whichever is greater) |
| Operating Temperature |
0-50°C |
| Protection Rating |
IP68 (continuous submersion) |
| Communication Interface |
RS-485, MODBUS RTU protocol |
| Power Supply |
DC 5-24V, current >50mA |
| Power Consumption |
0.1W |
| Installation Thread |
M22×1.5 (optional NPT3/4 adapter available) |
| Installation Type |
Inline/immersion type |
| Sensor Dimensions |
Φ22 mm × 175.5 mm |
| Cable Length |
10 m (standard), customizable |
| Calibration Method |
Zero point, one-point or two-point calibration |
| Housing Material |
Titanium (Ti) |
| Optical Window Material |
Sapphire |
Note: The above technical parameters are measured in laboratory standard conditions. Contact Induskey for the latest specifications.
5. Applications
The INK225 is engineered for versatile deployment across multiple industries requiring continuous turbidity monitoring:
Food & Beverage Industry
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Monitor water quality in production processes
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Ensure compliance with hygiene standards and HACCP requirements
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Process water and CIP (Clean-in-Place) system monitoring
Drinking Water Treatment
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Real-time turbidity monitoring in source water and treated water
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Regulatory compliance monitoring for potable water standards
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Filter performance monitoring and breakthrough detection
Electric Power Plants
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Turbidity monitoring in cooling water and boiler feed water systems
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Condensate polishing and steam purity monitoring
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Corrosion and deposition control
Pharmaceutical Manufacturing
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Precise turbidity monitoring for purified water and process water systems
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USP/EP water quality compliance
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WFI (Water for Injection) system monitoring
Wastewater Treatment
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Monitor effluent turbidity for process control and discharge compliance
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Clarifier and settling tank performance monitoring
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TSS (Total Suspended Solids) correlation
Metallurgy Industry
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Process water quality monitoring in metal processing and surface treatment
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Cooling water monitoring for rolling mills and casting operations
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Effluent treatment plant monitoring
Agricultural Irrigation
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Monitor water turbidity for irrigation systems to protect equipment and crops
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Drip irrigation system protection
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Reservoir and canal water quality assessment
Environmental Monitoring
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Surface water and groundwater quality assessment for environmental protection
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River and lake monitoring stations
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Stormwater and runoff monitoring
