Thermo Scientific APDSOIL Online Oil-in-Water Analyzer

Overview

The Thermo Scientific APDSOIL Online Oil-in-Water Analyzer is an industrial-grade, multi-parameter environmental monitoring system engineered for continuous, real-time quantification of hydrocarbon contaminants in aqueous matrices. Utilizing ultraviolet fluorescence (UVF) detection — a highly selective and sensitive optical method — the APDSOIL measures native fluorescence emissions from aromatic compounds present in petroleum-based oils (e.g., crude oil, diesel, lubricants, hydraulic fluids) upon excitation at specific UV wavelengths. Unlike infrared (IR) or gravimetric methods, UVF avoids interference from suspended solids and common organic interferents while delivering rapid response (<60 s), zero reagent consumption, and minimal maintenance. The analyzer integrates seamlessly with the Thermo Scientific AquaPro multi-channel analytical platform, enabling synchronized acquisition of oil-in-water concentration alongside complementary water quality parameters including pH, ORP, conductivity, dissolved oxygen (including optical RDO), turbidity, temperature, UV254 absorbance, chlorophyll-a, and phycocyanin.

Key Features

• UV fluorescence detection with dual-channel optical path design, supporting extended dynamic range up to 1000 ppm without dilution
• Patented short-path quartz flow cell with surface-treated optics and embedded chromatic/turbidity compensation algorithms for robust performance in colored or suspended-solid-rich effluents
• Gallium phosphide (GaP) photodiode detector with narrow-band spectral response, rated for continuous operation at ambient temperatures up to 50 °C and relative humidity ≥95% non-condensing
• Factory pre-calibrated with traceable NIST-traceable mineral oil standards; user-selectable calibration protocols accommodate site-specific oil compositions (e.g., BTEX-rich condensates vs. paraffinic distillates)
• IP66-rated, corrosion-resistant housing for probe and electronics; no consumables, no solvents, no moving parts in the optical path
• AquaPro host platform features a 7-inch color TFT display, intuitive menu navigation, on-device sensor diagnostics, and full field-configurable channel assignment
• Expandable to four simultaneous measurement channels; supports analog (4–20 mA, 0–5 V) and digital (SDI-12, Modbus RTU over RS-485) sensor inputs
• USB-based firmware updates and configuration cloning between units — eliminating manual setup errors during fleet deployment

Sample Compatibility & Compliance

The APDSOIL is validated for use across diverse industrial water streams, including produced water from upstream oil & gas operations, refinery wastewater, shipboard ballast water, boiler feedwater, reverse osmosis pretreatment influent, and cooling tower blowdown. It complies with ASTM D7678 (Standard Test Method for Determination of Oil and Grease in Water by Ultraviolet Fluorescence), and its measurement traceability aligns with ISO/IEC 17025 requirements when operated under documented QA/QC procedures. Data integrity meets GLP and GMP expectations via configurable audit trails, electronic signatures (per FDA 21 CFR Part 11 when integrated with compliant LIMS), and time-stamped calibration logs stored onboard the AquaPro controller.

Software & Data Management

The AquaPro platform includes embedded data logging (up to 1 million records), configurable alarm thresholds with relay outputs, and Modbus TCP/Ethernet/IP communication for SCADA integration. Optional Thermo Scientific Insight™ software provides remote access, historical trend visualization, automated report generation (PDF/CSV), and deviation alerting based on statistical process control (SPC) rules. All calibration events, diagnostic codes, and sensor health metrics are timestamped and exportable for regulatory submission or third-party verification.

Applications

• Real-time compliance monitoring of oil-in-water discharge limits per EPA NPDES permits and IMO Ballast Water Management Convention (BWMC) Regulation D-2
• Optimization of oil-water separation efficiency in API separators, IGFs, and dissolved air flotation (DAF) units
• Early detection of heat exchanger tube leaks in refinery and power plant cooling systems
• Protecting reverse osmosis membranes from hydrocarbon fouling in desalination and reuse applications
• Monitoring injection water quality for enhanced oil recovery (EOR) and reservoir management
• Process safety interlocks in offshore platforms where hydrocarbon ingress into utility water systems poses fire or environmental risk

FAQ

Does the APDSOIL require daily maintenance or chemical reagents?

No — the UVF optical system is reagent-free and contains no wet chemistry components. Routine verification using certified standard solutions is recommended every 30 days; optional automatic ultrasonic cleaning kits extend maintenance intervals.
Can the APDSOIL distinguish between different oil types (e.g., diesel vs. crude)?

It does not speciate hydrocarbons but provides total aromatic hydrocarbon response calibrated against representative reference oils. Cross-sensitivity studies show strong correlation (R² > 0.98) with IR-based methods per ASTM D7678 when calibrated with matching oil standards.
Is the system suitable for seawater applications?

Yes — the quartz flow cell and GaP detector are resistant to chloride-induced corrosion. Salinity compensation is applied algorithmically using concurrent conductivity measurements from the AquaPro platform.
How is calibration traceability ensured?

Each unit ships with a Certificate of Calibration referencing NIST SRM 2781 (mineral oil in water) and includes documented uncertainty budgets per ISO/IEC 17025 Annex A.3.
What cybersecurity features are implemented?

AquaPro firmware supports TLS 1.2 encrypted web interface, role-based user access control (admin/operator/viewer), and disabled default credentials — conforming to IEC 62443-3-3 Level 1 requirements for industrial control systems.