CUBIC INSTRUMENTS LRGA-3200EX In-situ Laser Raman Gas Analyzer

Overview

The CUBIC INSTRUMENTS LRGA-3200EX is an in-situ laser Raman gas analyzer engineered for real-time, non-invasive compositional analysis of industrial process streams. It operates on the fundamental principle of spontaneous Raman scattering: monochromatic laser light interacts with molecular vibrational modes in the gas phase, generating frequency-shifted scattered photons whose spectral positions and intensities are uniquely characteristic of chemical species and concentrations. Unlike absorption-based techniques (e.g., FTIR or tunable diode laser), Raman spectroscopy enables direct detection of homonuclear diatomic molecules—such as H₂, N₂, and O₂—which lack permanent dipole moments and are therefore invisible to infrared methods. The LRGA-3200EX integrates high-stability 532 nm or 785 nm excitation lasers, optimized fiber-coupled probe optics, and a thermoelectrically cooled CCD spectrometer to deliver robust signal-to-noise performance under harsh plant conditions. Designed for permanent mounting directly onto process piping or reactors, it eliminates sample extraction, conditioning, and transport delays—ensuring true in-situ measurement fidelity with sub-second response latency.

Key Features

• In-situ measurement architecture: Four integrated explosion-proof Raman probes mount directly onto process lines—no gas extraction, no sample conditioning systems, no consumables (e.g., chromatographic columns, valves, or pumps).
• Homonuclear diatomic gas capability: Simultaneous quantification of H₂, N₂, and O₂ alongside CO, CO₂, H₂S, CH₄, C₂H₂, C₂H₄, C₃H₆, and other hydrocarbons—up to 20 components per measurement cycle.
• Industrial-grade safety compliance: Probes certified to Ex d II C T4 Gb for use in Zone 1 hazardous areas; full system rated IP65 for dust and water ingress protection.
• Thermal and pressure resilience: Probe head operational from −20 °C to 200 °C; compatible with process pressures up to 4 MPa (580 psi) without external pressure regulation.
• Embedded touch interface: 10.1-inch防爆 (explosion-proof) capacitive touchscreen running a deterministic Linux-based OS; supports optional external keyboard/mouse via USB.
• Low-maintenance design: Solid-state optical path, no moving parts in the probe or spectrometer; typical calibration interval ≥6 months under stable operating conditions.

Sample Compatibility & Compliance

The LRGA-3200EX is validated for continuous monitoring of corrosive, toxic, flammable, and high-temperature process gases—including syngas, refinery off-gas, biogas, ammonia synthesis loops, and hydrogen production streams. Its non-contact optical sampling avoids cross-contamination and catalytic surface interference. All hardware and firmware comply with IEC 60079-0 (Explosive Atmospheres – General Requirements) and IEC 60079-1 (Flameproof Enclosures “d”). The system supports audit-ready operation under GLP and GMP frameworks: measurement logs include timestamped spectra, raw intensity arrays, calibration metadata, and user action records. While not pre-certified to FDA 21 CFR Part 11, its data export architecture (CSV, HDF5, XML) and role-based access control enable straightforward validation for regulated environments.

Software & Data Management

The embedded RamanSoft™ v4.x platform provides real-time spectral acquisition, multivariate curve fitting (using constrained non-negative least squares), and stoichiometric concentration calculation based on internal reference standards and pressure/temperature compensation algorithms. Spectral libraries are editable and expandable—users may import custom reference spectra (e.g., from NIST or in-house calibration cells). Data is stored locally on dual-redundant industrial SSDs (≥1 TB capacity) and simultaneously streamed via TCP/IP to DCS/SCADA systems using Modbus TCP or OPC UA (compliant with OPC Foundation specifications). Historical trends, alarm thresholds (with hysteresis), and batch reports are exportable in ISO/IEC 17025-aligned formats. Remote diagnostics and firmware updates are supported over secure SSH or TLS-enabled HTTP.

Applications

• Hydrogen purity verification in PEM electrolyzer and steam methane reformer (SMR) outlets.
• Real-time calorific value (CV) and Wobbe index calculation for natural gas and biomethane grid injection.
• Combustion optimization in fired heaters and gas turbines via O₂/CO ratio feedback.
• Leak detection and composition drift monitoring in ethylene cracker overheads and polyolefin purge streams.
• Process safety interlock support—e.g., H₂S breakthrough detection in amine regenerators or Claus tail gas units.
• Research-scale catalytic reaction monitoring under operando conditions (combined with furnace or reactor integration kits).

FAQ

Does the LRGA-3200EX require periodic recalibration with certified gas standards?
Yes—initial factory calibration uses NIST-traceable gas mixtures. Field recalibration is recommended every 6 months or after major maintenance events; users may perform span/zero checks using portable certified blends or inline reference cells.
Can the system operate in high-dust or high-humidity environments?
The probe’s sapphire window and purge gas port (optional N₂ or instrument air) maintain optical clarity in particulate-laden streams; the IP65-rated analyzer enclosure withstands ambient humidity up to 95% RH non-condensing.
Is spectral resolution adjustable?
Fixed at 4 cm⁻¹ (FWHM) across the 100–4000 cm⁻¹ Raman shift range—optimized for gas-phase peak separation and signal throughput; no user-adjustable grating or slit settings.
What cybersecurity protocols are implemented?
Role-based authentication (local and LDAP), TLS 1.2+ for remote connections, disabled default accounts, and configurable firewall rules via CLI; no open Telnet or FTP services enabled by default.
How is temperature compensation handled during high-temperature measurements?
Each probe integrates dual Pt100 RTDs—one at the window surface, one in the gas boundary layer—to feed real-time thermal expansion and rotational-vibrational population corrections into the quantification algorithm.