1. Product Overview
The IndusKey INK320 is a robust industrial-grade digital chlorophyll sensor engineered for continuous online monitoring of algae and phytoplankton in demanding aquatic environments. Featuring advanced fluorescence sensing technology with a sapphire optical window and an integrated automatic cleaning brush, the INK320 delivers accurate, stable measurements with minimal manual intervention.
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 INK320 is built for reliable long-term operation in demanding environments including water treatment facilities, hydrological monitoring stations, and process control systems.
2. Technical Principle
Measurement Technology
The INK320 employs the fluorescence method for chlorophyll measurement. A high-intensity LED emits excitation light at a specific wavelength, causing chlorophyll molecules in the water sample to fluoresce. The emitted fluorescence is detected by a high-sensitivity photodiode through a sapphire optical window. The signal intensity, proportional to chlorophyll 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 INK320 implements standard MODBUS RTU protocol over RS-485 physical layer. This industry-standard communication interface enables multi-drop networking with up to 247 devices on a single bus. The protocol supports read/write operations for measurement data, calibration parameters, and device configuration, allowing seamless integration with PLCs, SCADA systems, and data loggers.
3. Key Features & Competitive Advantages
A. Auto Self-Cleaning System
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Integrated mechanical brush prevents microbial attachment and biofouling on the optical window.
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Extends maintenance intervals significantly, reducing operational downtime and labor costs.
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Ensures measurement accuracy remains stable over extended deployment periods.
B. 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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Delivers precise chlorophyll concentration readings with minimal interference.
C. 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).
D. 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 zero-point, one-point, and two-point calibration methods for optimal accuracy.
E. IP68 Titanium Housing
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Titanium (Ti) alloy housing rated for continuous submersion up to 30 meters depth.
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Exceptional corrosion resistance in saltwater, chemical, and industrial wastewater environments.
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Compact form factor: Φ36mm × 198.2mm for easy installation in tight spaces.
F. Low Power Consumption
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0.2W during normal monitoring mode; 0.6W during wiping/cleaning cycle.
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Wide voltage input: DC 12–24V, ≥500mA.
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Ideal for solar-powered or remote monitoring stations.
4. Technical Specifications
| Parameter |
Specification |
| Model |
INK320 |
| Measurement Principle |
Fluorescence method |
| Measurement Range |
0 – 500 µg/L |
| Accuracy |
±5% or 0.5 µg/L (whichever is greater) |
| Resolution |
0.01 µg/L |
| Operating Temperature |
0 – 50°C |
| Maximum Water Depth |
30 meters |
| Protection Rating |
IP68 |
| Communication Interface |
RS-485, MODBUS RTU protocol |
| Power Supply |
DC 12–24V, ≥500mA |
| Power Consumption |
0.2W (non-wiping) / 0.6W (wiping) |
| Dimensions |
Φ36mm × 198.2mm |
| Cable Length |
10m (standard), customizable |
| Calibration Method |
Zero-point, one-point, or two-point calibration |
| Housing Material |
Titanium (Ti) |
Note: Technical parameters measured under laboratory standard liquid conditions unless otherwise stated.
5. Applications
The IndusKey INK320 is engineered for versatile deployment across water quality monitoring and environmental management sectors:
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Water Quality Monitoring: River, lake, reservoir water quality assessment and environmental quality 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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Wastewater Treatment: Process optimization in municipal and industrial effluent treatment facilities.
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Aquaculture: Algae and phytoplankton monitoring in fish farms, shellfish hatcheries, and pond systems.
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Marine Survey: Oceanographic research, coastal water quality investigation, and marine ecology studies.
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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 INK320 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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Multi-Sensor Networking: Deploy multiple INK320 units on a single RS-485 bus for distributed monitoring across large water bodies or treatment systems.
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Data Logger Compatibility: Direct integration with mainstream industrial data loggers and remote telemetry units.
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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.
