HORIBA GA-370 Trace Gas Analyzer

Overview

The HORIBA GA-370 Trace Gas Analyzer is an industrial-grade, continuous multicomponent gas analyzer engineered for ultra-trace quantification of carbon monoxide (CO), carbon dioxide (CO₂), and methane (CH₄) in high-purity carrier gases. It employs a proprietary dual-beam, alternating flow modulated non-dispersive infrared (NDIR) optical architecture—eliminating mechanical choppers, optical alignment requirements, and zero-point drift through intrinsic signal referencing. Unlike conventional single-beam NDIR systems, the GA-370 alternately introduces sample and reference gas into two matched optical cells, generating differential absorption signals proportional to target analyte concentration. This symmetrical flow modulation yields enhanced signal-to-noise ratio, enabling stable, reproducible measurements down to 10 ppb across nitrogen, oxygen, helium, argon, hydrogen, and synthetic air matrices. The instrument is purpose-built for real-time process monitoring in critical infrastructure where trace-level impurity control directly impacts product compliance, safety, and catalyst longevity—particularly in air separation units (ASUs), on-site hydrogen refueling stations, and semiconductor-grade gas manufacturing lines.

Key Features

• Ultra-low detection limit of 10 ppb for CO, CO₂, and CH₄—validated per ISO 10723:2012 methodology for trace hydrocarbon and carbon oxide analysis
• Dual-beam alternating flow NDIR optics: no optical chopper, no manual alignment, inherently drift-free operation over extended unattended periods
• Integrated color touchscreen LCD with time-series trend visualization, configurable alarm thresholds, and onboard data logging (up to 30 days at 1-min intervals)
• Pre-calibrated modular sensor design: field-replaceable optical modules reduce downtime and eliminate recalibration dependency on external service engineers
• Gas matrix flexibility: validated for use with N₂, O₂, He, Ar, H₂, and air as balance gases; optional configuration support available for custom matrices upon consultation with HORIBA Applications Engineering
• Robust industrial enclosure rated IP65, compliant with IEC 61000-6-2/6-4 for electromagnetic immunity in plant-floor environments

Sample Compatibility & Compliance

The GA-370 is qualified for direct measurement of CO, CO₂, and CH₄ in high-purity process gases meeting ISO 8573-1 Class 1 or better specifications. Its performance aligns with mandatory impurity limits defined in GB/T 37244–2018 (Fuel Hydrogen for Proton Exchange Membrane Fuel Cell Vehicles), where CO ≤ 0.2 ppm, CO₂ ≤ 2 ppm, and CH₄ ≤ 2 ppm are required for Grade A hydrogen. In air separation applications, it supports pre-purification unit (PPU) validation per ASME B31.12 and CGA G-13 guidelines by verifying sub-ppm CO₂ and CO levels upstream of cryogenic distillation columns—preventing solid CO₂ deposition and ensuring operational safety. For hydrogen service, installation within explosion-proof enclosures (e.g., NEC Class I, Division 1, Group B/C/D) is mandatory when deployed in H₂-rich zones. The analyzer does not meet intrinsic safety (IS) certification standards and must be integrated into facility-level hazardous area mitigation strategies.

Software & Data Management

The GA-370 operates via embedded firmware with web-accessible configuration interface (HTTP/HTTPS) and Modbus TCP/RTU protocol support for SCADA integration. All measurement data—including raw detector signals, temperature-compensated concentration values, diagnostic flags, and calibration event logs—are timestamped and stored internally with SHA-256 hash integrity verification. Audit trails comply with GLP and GMP principles: user login sessions, parameter changes, and calibration actions are immutably recorded with operator ID and UTC timestamps. Optional PC-based HORIBA TraceView software enables advanced statistical process control (SPC), automated report generation (PDF/CSV), and alignment with FDA 21 CFR Part 11 requirements through digital signature support and role-based access controls.

Applications

• Air Separation Units (ASUs): Continuous monitoring of CO and CO₂ breakthrough in molecular sieve beds and post-PPU streams to prevent cryogenic column fouling and ensure ISO 8573-5 Class 2 purity certification
• On-Site Hydrogen Production Facilities: Real-time verification of reformate and PSA tail-gas purity against GB/T 37244–2018 and SAE J2719 specifications prior to compression and dispensing
• Semiconductor Gas Delivery Systems: In-line verification of bulk N₂, Ar, and He supply lines for fab tool purge and chamber backfilling, supporting IEST-STD-CC1246E particle and contamination control protocols
• Calibration Gas Manufacturing: Final QC release testing of certified reference materials (CRMs) for CO, CO₂, and CH₄ in inert matrices per ISO Guide 34 and ISO/IEC 17025
• Research Laboratories: Quantitative study of low-concentration gas-phase reaction intermediates in catalytic hydrogenation, combustion, and electrochemical synthesis experiments

FAQ

What balance gases are supported out-of-the-box?
N₂, O₂, He, Ar, H₂, and synthetic air are factory-validated. Other matrices require application-specific configuration and may necessitate custom calibration gas sets.
Is the GA-370 suitable for hazardous area installation?
No—it is not intrinsically safe or explosion-proof rated. Deployment in Class I, Division 1 or ATEX Zone 1 environments requires integration into a certified explosion-proof housing or remote sampling with draw-and-dilute configuration.
How often is calibration required?
Zero and span calibration intervals are user-defined based on process stability; typical practice in regulated environments is daily zero check with monthly full-span verification using NIST-traceable standard gases.
Can the GA-370 measure gases beyond CO, CO₂, and CH₄?
No—the optical filter set and detector tuning are fixed for these three analytes. HORIBA offers complementary instruments (e.g., GA-400 series) for NOₓ, SO₂, NH₃, or H₂S measurement.
Does the analyzer support 21 CFR Part 11 compliance?
Yes—when used with TraceView software and configured with electronic signatures, audit trail logging, and access controls, it satisfies predicate rule requirements for electronic records and signatures in pharmaceutical and medical gas manufacturing.