LGA-8500 Online Laser Gas Analyzer by FPI

Overview

The LGA-8500 Online Laser Gas Analyzer is a tunable diode laser absorption spectroscopy (TDLAS)-based continuous emission monitoring system engineered for real-time, in-situ quantitative analysis of specific gas species in harsh industrial process streams. Utilizing single-line direct absorption spectroscopy at near-infrared (NIR) wavelengths, the analyzer targets fundamental rotational-vibrational transitions with high spectral selectivity—ensuring negligible cross-sensitivity to interfering gases. Its long-path optical cavity design enhances effective path length without physical extension, thereby improving detection sensitivity and lowering the limit of detection (LOD) to sub-ppm levels for target analytes such as O₂, CO, CH₄, H₂S, NH₃, HF, HCl, and H₂O vapor. The instrument operates under extractive or in-situ probe configurations, supporting continuous unattended operation in ambient temperatures ranging from –20 °C to +60 °C and relative humidity up to 95% non-condensing.

Key Features

• Single-line TDLAS technology with wavelength modulation spectroscopy (WMS) for enhanced signal-to-noise ratio and baseline stability
• Optimized multi-pass optical cavity delivering effective path lengths up to 20 meters—enabling high sensitivity without complex sample conditioning
• Ruggedized industrial enclosure rated IP66, suitable for Zone 2/Class I Div 2 hazardous locations when configured with appropriate certifications
• Integrated temperature and pressure compensation algorithms compliant with ideal gas law corrections per ISO 14644-1 and ASTM D6245
• Self-diagnostic firmware with real-time optical alignment monitoring and automatic zero/span verification triggers
• Modular hardware architecture supporting field-upgradable gas modules and dual-channel simultaneous measurement capability

Sample Compatibility & Compliance

The LGA-8500 accommodates hot, wet, and particulate-laden gas streams typical of refinery catalytic cracking units, syngas lines in coal chemical plants, chlorine electrolysis off-gases, and natural gas transmission pipelines. It meets mechanical and electromagnetic compatibility requirements per EN 61326-1 (industrial environments) and EN 61000-6-2/-4. For regulated applications—including EPA Method 205 compliance verification and EU Industrial Emissions Directive (IED) reporting—the analyzer supports traceable calibration using NIST-traceable reference standards and maintains full audit trails for calibration events, maintenance logs, and configuration changes in accordance with FDA 21 CFR Part 11 and ISO/IEC 17025 data integrity guidelines.

Software & Data Management

FPI’s proprietary GasView™ software provides browser-based remote access for configuration, real-time trend visualization, alarm management, and report generation. The embedded Linux OS supports OPC UA (IEC 62541) and Modbus TCP protocols for seamless integration into DCS/SCADA systems (e.g., Emerson DeltaV, Honeywell Experion, Siemens PCS7). All measurement data—including raw absorbance spectra, fitted peak areas, and environmental correction parameters—are timestamped and stored locally on an industrial-grade SSD with ≥12 months of retention capacity. Export formats include CSV, PDF, and XML, compatible with LIMS platforms and enterprise analytics tools such as PI System and AspenTech InfoPlus.21.

Applications

• Refineries: Continuous monitoring of H₂S and NH₃ in amine regenerator overheads and FCC flue gas
• Petrochemical plants: CH₄ and CO tracking in ethylene cracker convection sections and steam reformer tail gas
• Chlor-alkali facilities: Real-time HF and Cl₂ leak detection in cell room ventilation ducts
• Natural gas processing: Moisture (H₂O) and CO₂ quantification pre- and post-dehydration units
• Fine chemical synthesis: In-reactor NH₃ concentration control during nitration and hydrogenation steps
• Coal-to-chemicals: O₂ and CO monitoring in gasifier syngas trains for safety interlock and efficiency optimization

FAQ

What gas species can the LGA-8500 measure simultaneously?

Up to two gas components can be measured concurrently using dual-laser modules; additional species require sequential scanning or hardware expansion.
Is sample conditioning required for high-dust applications?

For in-situ probe installation, no external conditioning is needed; for extractive mode, a heated filter and bypass flow regulator are recommended for particulate loads >10 mg/Nm³.
How often does the system require calibration verification?

Calibration drift checks are recommended every 30 days using certified span gas; full 3-point calibration is advised quarterly or after major maintenance events.
Does the analyzer support SIL2 functional safety certification?

Yes—when integrated with FPI’s certified safety logic solver and configured per IEC 61511, the LGA-8500 meets SIL2 requirements for critical gas detection loops.
Can the device operate in explosive atmospheres?

With optional ATEX/IECEx-certified explosion-proof housing (Model LGA-8500-EX), it is approved for use in Zone 1 and Zone 2 gas groups IIA–IIB, T4 temperature class.