1. Product Overview
The IndusKey INK332 is an industrial-grade digital oil-in-water sensor engineered for continuous online monitoring of dissolved and emulsifiable oils in industrial process and wastewater applications. Featuring advanced ultraviolet fluorescence sensing technology with an integrated automatic cleaning brush, the INK332 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 316L stainless steel housing rated to IP68, the INK332 is built for reliable long-term operation in demanding environments. Titanium (Ti) body option available for highly corrosive applications.
2. Technical Principle
Measurement Technology
The INK332 employs the ultraviolet fluorescence method for oil-in-water measurement. Aromatic hydrocarbon compounds present in oil absorb UV excitation light and emit characteristic fluorescence at specific wavelengths. A precision photodetector captures the emission intensity, which exhibits a direct linear correlation with oil concentration in the sample.
Signal Processing
Advanced digital signal conditioning processes the raw photodetector output through built-in calibration parameters to produce stable, temperature-compensated concentration readings. Linearity exceeds R² > 0.999 across the full measurement range, ensuring high-precision quantitative results.
Communication Protocol
The INK332 implements standard MODBUS RTU protocol over RS-485 physical layer. This industry-standard communication interface enables multi-drop networking. The protocol supports read/write operations for measurement data, calibration coefficients, and device configuration, allowing direct integration with PLCs, DCS, and SCADA systems.
3. Key Features & Competitive Advantages
A. UV Fluorescence Detection
B. Auto Self-Cleaning Brush
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Integrated mechanical brush prevents microbial adhesion and biofouling on the optical window.
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Extends maintenance intervals significantly, reducing operational downtime and labor costs.
C. Digital RS-485 / MODBUS Output
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Standard MODBUS RTU protocol for easy system integration and networking.
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Compatible with mainstream PLCs, DCS, SCADA systems, and data loggers.
D. Reagent-Free Operation
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No chemical reagents or consumables required.
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Strong anti-interference capability with minimal calibration requirements.
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Significantly reduces operating costs compared to laboratory analysis methods.
E. Built-in Calibration
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All calibration data stored in non-volatile sensor memory.
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Supports zero-point, one-point, and two-point calibration methods for optimal accuracy.
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Enables immediate use after installation.
F. IP68 Submersible Housing
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316L stainless steel housing rated for continuous submersion up to 30 meters depth.
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Titanium (Ti) body option available for seawater, produced water, and highly corrosive environments.
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Compact form factor: Ø45mm × 190.8mm.
G. Low Power Consumption
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0.2W during normal monitoring; 0.6W during wiping/cleaning cycle.
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Wide voltage input: DC 5–12V, ≥500mA.
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Ideal for solar-powered or remote monitoring stations.
4. Technical Specifications
| Parameter |
Specification |
| Model |
INK332 (Self-Cleaning Oil-in-Water Sensor) |
| Measurement Principle |
Ultraviolet fluorescence method |
| Measurement Range |
0–50 ppm or 0–150 ppm (configurable) |
| Linearity |
R² > 0.999 |
| Resolution |
0.01 ppm |
| Temperature Range |
0–50°C |
| Maximum Water Depth |
30 meters |
| Protection Rating |
IP68 |
| Communication Interface |
RS-485, MODBUS RTU protocol |
| Power Supply |
DC 5–12V, ≥500mA |
| Power Consumption |
0.2W (normal) / 0.6W (wiping) |
| Dimensions |
Ø45mm × 190.8mm |
| Cable Length |
10m (standard), customizable |
| Calibration Method |
Zero-point, one-point, or two-point calibration |
| Housing Material |
316L stainless steel (Ti optional) |
Note: All technical parameters are measured in a laboratory standard liquid environment. Field performance may vary based on process conditions.
5. Applications
The IndusKey INK332 is engineered for versatile deployment across industrial process control, environmental compliance, and water quality management sectors:
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Industrial Wastewater: Compliance monitoring for oil-contaminated effluent discharge in manufacturing and treatment facilities.
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Oil & Gas Produced Water: Treatment process monitoring and discharge control for produced water in upstream operations.
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Power Plant Condensate: Steam system leak detection and turbine oil monitoring in thermal and nuclear power stations.
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Cooling Water Systems: Early detection of lubricant and hydraulic oil leaks in heat exchangers and cooling circuits.
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Marine Bilge Water: Onboard oil content monitoring for MARPOL compliance and bilge water discharge management.
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Food & Beverage Processing: Vegetable oil and fat detection in process water and CIP rinse monitoring.
6. Optional Accessories & Integration Support
To maximize operational flexibility, the INK332 seamlessly integrates with optional system accessories and platform solutions:
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Mounting Hardware & Installation Brackets: Dedicated brackets for secure deployment in tanks, open water, or pipeline chambers.
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Cable Extension Assemblies: Standard 10m cable; custom lengths available on request for deep-water or remote installations.
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Calibration Standards & Verification Kits: Factory-certified calibration solutions for field verification and accuracy maintenance.
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Titanium Body Upgrade: Optional titanium housing for seawater, produced water, and highly corrosive process environments.
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Custom Range Configuration: Contact IndusKey for custom measurement ranges and volume pricing.
Certifications & Interface:
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Protection Rating: IP68 — Submersible operation up to 30m depth
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Communication: RS-485 serial interface with standard MODBUS RTU protocol
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Power Requirements: DC 5–12V, minimum 500mA supply capacity
