1. Product Overview
The IndusKey INK330 is an industrial-grade oil-in-water sensor that utilizes the ultraviolet (UV) fluorescence method for the detection and quantification of dissolved and emulsified petroleum hydrocarbons in aqueous environments. This measurement principle offers superior sensitivity, faster response times, and excellent repeatability compared to conventional infrared scattering or gravimetric methods.
Engineered as a fully digital sensor with RS-485 output and standard MODBUS RTU protocol, the INK330 integrates seamlessly into SCADA systems, PLCs, and distributed control networks. Its titanium alloy construction ensures reliable operation in demanding environments including seawater, produced water, and high-salinity process streams.
Measurement Target: Dissolved and emulsified crude oil, petroleum hydrocarbons, and refined oil products in water matrices. No reagents required; minimal maintenance.
2. Technical Principle
Measurement Technology
The INK330 operates on the principle of UV-induced fluorescence spectroscopy. Polycyclic aromatic hydrocarbons (PAHs) present in petroleum products absorb ultraviolet light at a specific excitation wavelength and emit fluorescence at a longer characteristic wavelength. The intensity of the emitted fluorescence is directly proportional to the concentration of oil in the water sample.
Excitation & Detection
A UV LED source emits excitation light into the measurement window. Fluorescence emitted by oil molecules is detected by a photodiode assembly with optical filtering to isolate the target emission wavelength.
Signal Processing
An onboard microprocessor digitizes the photocurrent signal, applies temperature compensation algorithms, and converts the result to oil concentration (ppm) via the factory-calibrated response curve.
Temperature Compensation
Integrated temperature sensing enables automatic compensation of fluorescence quantum yield variations across the 0–50°C operating range, ensuring measurement stability.
Digital Communication
Processed data is transmitted via RS-485 serial bus using standard MODBUS RTU protocol (function codes 03/04/06), enabling direct integration with PLCs, HMIs, and data loggers.
3. Key Features & Competitive Advantages
A. UV Fluorescence Technology
B. Reagent-Free Operation
C. Digital RS-485 / MODBUS Output
D. Titanium Alloy Construction
E. Submersible IP68 Rating
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Rated for continuous submersion up to 60 meters water depth.
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Suitable for open water, tank, and pipeline installations.
F. Flexible Calibration
G. Wide Dynamic Range
H. Low Power Consumption
4. Technical Specifications
| Parameter |
Specification |
| Product Name |
Oil-in-Water Sensor (without brush) |
| Model |
INK330 |
| Measurement Principle |
Ultraviolet (UV) fluorescence method |
| Measurement Range |
0–50 ppm or 0–150 ppm (selectable) |
| Linearity |
R² > 0.999 |
| Resolution |
0.01 ppm |
| Operating Temperature |
0 to 50°C (water temperature) |
| Maximum Water Depth |
60 m |
| Protection Rating |
IP68 (continuous submersion) |
| Communication Interface |
RS-485, MODBUS RTU protocol |
| Supply Voltage |
DC 9–24 V |
| Power Consumption |
0.2 W (typical); current >50 mA |
| Sensor Dimensions |
Ø22 mm × 175.5 mm (L) |
| Cable Length |
10 m (standard); customizable upon request |
| Calibration Method |
Zero-point, one-point, or two-point calibration |
| Housing Material |
Titanium (Ti) |
Note: All technical parameters are validated under laboratory standard liquid environment conditions unless otherwise specified.
5. Applications
The INK330 oil-in-water sensor is designed for continuous online monitoring across a broad range of industrial and environmental applications where detection of petroleum hydrocarbons in water is critical for operational efficiency, regulatory compliance, or environmental protection:
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Oil Field Produced Water Monitoring: Real-time tracking of oil content in produced water streams for regulatory discharge compliance and process optimization.
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Petrochemical Process Water Analysis: Inline monitoring of process water and effluent streams in refineries and chemical plants.
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Marine & Port Oil Spill Detection: Early warning monitoring in harbors, coastal waters, and marine terminals.
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Municipal Water Intake Protection: Safeguarding drinking water sources against accidental oil contamination.
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Pipeline Leak Detection & Transport: Monitoring of pipeline integrity and transport system discharge points.
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Refinery Wastewater Discharge Control: Ensuring effluent oil concentrations remain within permitted limits.
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Power Plant Cooling Water Systems: Detection of lubricant or fuel oil leaks in cooling water circuits.
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Environmental Compliance Monitoring: Surface water and groundwater monitoring for regulatory reporting and environmental impact assessment.
6. Optional Accessories & Integration Support
To maximize operational flexibility, the INK330 seamlessly integrates with optional system accessories and platform solutions:
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Mounting Bracket (Stainless Steel): Dedicated installation bracket for secure deployment in tanks, open water, or pipeline chambers.
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Extension Cable: Custom cable lengths available upon request for deep-water or remote installations.
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Protective Cage Assembly: Additional mechanical protection for high-flow or debris-prone environments.
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Calibration Standards: Factory-certified calibration solutions (0 ppm, 50 ppm) available for field verification.
Certifications & Compliance: CE marked (EMC Directive, RoHS); IP68 per IEC 60529; Quality system: ISO 9001.
Electrical Interface: RS-485 (2-wire, half-duplex); Baud rate: 9600 bps (default); Protocol: MODBUS RTU slave; Register map available on request.
