Online Instrument OL1011EX Intrinsically Safe Online Oil-in-Water Analyzer

Overview

The Online Instrument OL1011EX is an intrinsically safe, fully automated online oil-in-water analyzer engineered for continuous, real-time quantification of total petroleum hydrocarbons (TPH), animal/vegetable oils (AVO), and their sum (total oil) in aqueous effluents. Based on dual-beam Fourier-transform infrared (FTIR) spectrophotometry calibrated to the C–H stretching vibration bands (2930 cm⁻¹, 2960 cm⁻¹, and 2870 cm⁻¹), the system complies with the fundamental spectral basis of ISO 9377-2, ASTM D7066, and China’s HJ 637–2018 standard method for petroleum and AVO determination. Designed for hazardous area deployment (ATEX II 2G Ex d IIB T4 Gb / IECEx Ex d IIB T4 Gb), the OL1011EX integrates explosion-proof enclosure, purge-compatible electronics, and non-sparking fluidic pathways—enabling direct installation in Zone 1/2 classified environments common in petrochemical refineries, offshore platforms, and coal mine drainage stations.

Key Features

• Intrinsically safe architecture certified for Class I, Division 1 (NEC) and Zone 1 (IECEx/ATEX) locations, with aluminum alloy explosion-proof housing rated IP65.
• Triple-parameter simultaneous output: petroleum hydrocarbons, animal/vegetable oils, and total oil—calculated via spectral deconvolution using reference spectra of n-hexadecane, pristane, and stearic acid.
• Integrated silica-magnesium adsorption column with real-time reagent depletion monitoring; column status communicated via Modbus TCP to SCADA or DCS systems.
• Automated liquid–liquid extraction using high-purity tetrachloroethylene (C₂Cl₄), followed by phase separation via hydrophobic membrane filtration and residual water removal via anhydrous Na₂SO₄ drying cartridge.
• Reverse-pressure backflush mechanism prevents column fouling and cross-contamination between sequential samples—critical for high-suspended-solid wastewater streams.
• Onboard homogenization module ensures molecular-level mixing of heterogeneous influent prior to sampling, eliminating stratification bias in low-flow or intermittent discharge scenarios.
• Zero-operator exposure design: fully sealed fluid path, activated carbon–packed exhaust treatment, and automatic collection of spent solvents into UN-certified containment vessels.

Sample Compatibility & Compliance

The OL1011EX accepts raw, unfiltered wastewater within a temperature range of 0–90 °C and suspended solids concentration up to 150 mg/L. It is validated for use with municipal sewage, refinery process water, coking wastewater, metallurgical cooling water, and port runoff. All wetted materials—including PTFE-lined peristaltic tubing, Hastelloy C-276 valves, and fused silica flow cells—are chemically resistant to chlorinated solvents and acidic/alkaline matrices. The analyzer meets GLP data integrity requirements through audit-trail-enabled calibration logging, electronic signatures per FDA 21 CFR Part 11, and traceable calibration against NIST-traceable oil standards (e.g., SRM 2781). Routine verification follows ISO/IEC 17025-compliant internal procedures including blank drift assessment (<0.02 mg/L/24 h) and spike recovery testing (85–115% across 5–5000 mg/L range).

Software & Data Management

Embedded Linux-based controller supports local operation via 10.1″ capacitive touchscreen with intuitive HMI, or remote supervision via Ethernet (Modbus TCP, OPC UA), 4–20 mA analog output (isolated), and optional 4G LTE telemetry. Calibration workflows include multi-point standard curve generation, single-point rapid recalibration, and auto-dilution-triggered range extension for over-range events. All measurement metadata—sample ID, timestamp, temperature, pressure, solvent batch ID, column usage counter, and spectral raw data (CSV + .spc)—are stored onboard for ≥18 months and exportable via USB or SFTP. Firmware updates are digitally signed and validated prior to installation to ensure system integrity.

Applications

• Continuous compliance monitoring of effluent discharge limits under EU WFD, US EPA NPDES permits, and China’s GB 8978–1996.
• Process optimization in crude oil desalting units, produced water treatment trains, and coke oven wastewater recycling loops.
• Early leak detection in underground storage tank (UST) interstitial monitoring and pipeline pigging wastewater streams.
• Real-time feed-forward control of dissolved air flotation (DAF) coagulant dosing based on incoming oil load.
• Long-term trend analysis for environmental impact assessments (EIAs) in mining and thermal power plant operations.

FAQ

What explosion protection certification does the OL1011EX hold?

It carries ATEX II 2G Ex d IIB T4 Gb and IECEx Ex d IIB T4 Gb certifications, permitting installation in gas Group IIB environments with maximum surface temperature ≤135 °C.
Can the system operate without manual intervention for extended periods?

Yes—maintenance intervals are set to seven days under typical industrial wastewater conditions; reagent cartridges, drying agents, and adsorption columns are designed for plug-and-play replacement with tool-free access.
Is tetrachloroethylene the only extractant compatible with this analyzer?

The system is factory-optimized for tetrachloroethylene per HJ 637–2018; alternative IR-transparent solvents (e.g., FC-40) may be used only after full revalidation of spectral response and extraction efficiency.
How is data integrity ensured during remote transmission?

All communication employs TLS 1.2 encryption; critical parameters (e.g., calibration date, operator ID, QC flags) are embedded in each data packet and verified server-side against SHA-256 checksums.
Does the analyzer support integration with existing DCS or MES platforms?

Yes—native Modbus TCP and OPC UA (PubSub over UDP) drivers are included; custom protocol mapping (e.g., Profibus DP, BACnet MS/TP) is available via optional firmware modules.