1. Product Overview
The IndusKey INK322 is a robust industrial-grade digital blue-green algae sensor engineered for continuous online monitoring of cyanobacteria concentration in water systems. Featuring advanced fluorescence sensing technology with a sapphire optical window, the INK322 delivers accurate, stable measurements with minimal manual intervention and no sample pre-treatment required.
The sensor employs RS-485 communication with standard MODBUS RTU protocol, enabling seamless integration into existing industrial control systems, PLCs, and SCADA platforms. All calibration data is stored internally within the sensor memory, facilitating true plug-and-play installation. With its titanium (Ti) housing rated to IP68, the INK322 is built for reliable long-term operation in demanding environments including water treatment facilities, hydrological monitoring stations, drinking water source protection, and process control systems — with continuous submersion capability up to 60 meters depth.
2. Technical Principle
Measurement Technology
The INK322 employs the fluorescence method for blue-green algae measurement. A high-intensity LED emits excitation light at a specific wavelength, causing phycocyanin pigments in cyanobacteria cells to fluoresce. The emitted fluorescence is detected by a high-sensitivity photodiode through a sapphire optical window. The signal intensity, proportional to algae concentration, is processed by an integrated microprocessor and converted to concentration values using established calibration algorithms.
Signal Processing
An integrated microprocessor performs real-time signal conditioning, filtering, and temperature compensation. The raw fluorescence signal is amplified, digitized, and processed to eliminate ambient light interference and electronic drift. Advanced algorithms ensure stable readings across the full operational temperature range, delivering reliable measurements in varying environmental conditions.
Communication Protocol
The INK322 implements standard MODBUS RTU protocol over RS-485 physical layer. The RS-485 interface provides robust differential signaling with excellent noise immunity, making it ideal for industrial environments. Standard MODBUS registers allow direct access to real-time concentration readings, device status, and diagnostic information. This industry-standard communication interface enables multi-drop networking with up to 247 devices on a single bus, supporting read/write operations for measurement data, calibration parameters, and device configuration.
3. Key Features & Competitive Advantages
A. Advanced Fluorescence Sensing
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High-intensity LED excitation source paired with high-sensitivity photodiode detection.
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Sapphire optical window provides exceptional optical clarity, scratch resistance, and chemical durability.
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Specifically targets phycocyanin pigments in cyanobacteria for precise blue-green algae detection.
B. Digital RS-485 / MODBUS RTU Output
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Standard industrial communication protocol for easy system integration and networking.
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Supports multi-drop topology — up to 247 sensors on a single bus.
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Compatible with mainstream PLCs, SCADA systems, and remote terminal units (RTUs).
C. Internal Data Storage
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All calibration data stored in non-volatile sensor memory.
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Enables immediate use after installation without recalibration.
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Supports one-point and two-point calibration methods for optimal accuracy.
D. Real-Time Online Monitoring
E. IP68 Titanium Housing
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Titanium (Ti) alloy housing rated for continuous submersion up to 60 meters depth.
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Exceptional corrosion resistance in saltwater, chemical, and industrial wastewater environments.
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Ultra-compact form factor: Φ22mm × 175.5mm for easy installation in tight spaces and existing monitoring wells.
F. Ultra-Low Power Consumption
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Wide voltage input: DC 6–24V, current >50mA.
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Power consumption: 0.2W — ideal for solar-powered, battery-operated, or remote monitoring stations.
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Simplified wiring requirements reduce installation complexity and infrastructure costs.
4. Technical Specifications
| Parameter |
Specification |
| Model |
INK322 |
| Measurement Principle |
Fluorescence method |
| Measurement Range |
0 – 300,000 cells/mL (customizable to 0 – 2,000,000 cells/mL) |
| Linearity |
R² > 0.999 |
| Resolution |
1 cells/mL |
| Operating Temperature |
0 – 50°C |
| Maximum Water Depth |
60 meters |
| Protection Rating |
IP68 |
| Communication Interface |
RS-485, MODBUS RTU protocol |
| Power Supply |
DC 6–24V, current >50mA |
| Power Consumption |
0.2W |
| Dimensions |
Φ22mm × 175.5mm |
| Cable Length |
10m (standard), customizable |
| Calibration |
One-point or two-point calibration |
| Body Material |
Titanium (Ti) |
Note: Technical parameters measured under laboratory standard liquid conditions unless otherwise stated.
5. Applications
The IndusKey INK322 is engineered for versatile deployment across water quality monitoring and environmental management sectors:
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Water Quality Monitoring: River, lake, and reservoir water quality assessment and environmental monitoring programs.
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Drinking Water Sources: Monitoring of algae levels in raw water intakes, reservoirs, and treatment plant inflows.
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Water Supply Networks: Distribution system water quality monitoring and smart water management solutions.
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Aquaculture: Algae and phytoplankton monitoring in fish farms, shellfish hatcheries, and pond systems.
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Wastewater Treatment: Process optimization in municipal and industrial effluent treatment facilities.
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Research & Laboratories: Algal bloom research, ecological studies, and phytoplankton community investigation.
6. Optional Accessories & Integration Support
To maximize operational flexibility, the INK322 seamlessly integrates with optional system accessories and platform solutions:
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Custom Cable Lengths: Standard 10m cable available; extended lengths customizable upon request for deep-water or remote installations.
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Mounting Bracket (Optional): Dedicated installation bracket for secure deployment in open water, tanks, or pipelines.
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Calibration Standards: Factory-certified calibration solutions available for one-point and two-point calibration procedures.
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Multi-Sensor Networking: Deploy multiple INK322 units on a single RS-485 bus for distributed monitoring across large water bodies or treatment systems.
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SCADA / IoT Platform Integration: Sensor data can be routed to centralized monitoring dashboards, corporate environmental management systems, or regulatory compliance platforms via standard MODBUS mapping.
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Technical Documentation: Complete MODBUS register map, integration guides, and calibration certificates available upon request.
