GasAnalyser GA-m Portable Biogas and Landfill Gas Analyzer

Overview

The GasAnalyser GA-m is a rugged, field-deployable portable gas analyzer engineered for real-time, multi-component analysis of biogas, landfill gas, and anaerobic digestion off-gas. It integrates non-dispersive infrared (NDIR) spectroscopy for CH₄ and CO₂, electrochemical (EC) sensors for O₂, H₂S, CO, H₂, NH₃, NO, NO₂, SO₂, and optional thermal mass flow measurement — all within a single, compact housing. Unlike fixed analyzers requiring complex installation, the GA-m delivers laboratory-grade compositional accuracy under dynamic field conditions by applying real-time compensation for temperature, pressure, and relative humidity (5–40 °C; 10–90 % RH). Its core measurement principle relies on wavelength-specific IR absorption (CH₄: 3.3 µm; CO₂: 4.26 µm) and diffusion-controlled electrochemical reactions, ensuring trace-level sensitivity and long-term stability. Designed to meet the operational demands of biogas upgrading plants, wastewater treatment facilities, landfill monitoring stations, and emergency response teams, the GA-m supports compliance with ISO 14064-1 (GHG quantification), EN 16726 (biogas quality for CHP), and EU Directive 1999/92/EC (ATEX Zone 1 & 2 classification).

Key Features

• ATEX-certified explosion-proof design (EEx ib IIB T1) for safe operation in hazardous zones 1 and 2
• Modular sensor architecture: up to 7 simultaneous gas channels — configurable with NDIR (CH₄, CO₂) and EC (O₂, H₂S, CO, H₂, NH₃, NO, NO₂, SO₂) modules
• Integrated high-flow sampling pump (400 mL/min) capable of drawing samples under negative pressure (−400 mbar)
• User-replaceable micro-particulate filter and hot-swappable rechargeable Li-ion battery (10 h typical runtime; 2–4 h recharge)
• Onboard data logger storing up to 2,000 measurement sets with timestamp, location tag, and environmental metadata (T, P, RH)
• Optional integrated thermal mass flow module (0.25–25 Nm/s; 0–12,000 Nm³/hr) with automatic composition-based correction per ISO 6976
• IP54-rated enclosure (200 × 100 × 60 mm; 750 g) for dust and splash resistance in outdoor and industrial environments

Sample Compatibility & Compliance

The GA-m is validated for continuous analysis of wet, particulate-laden, and corrosive biogas streams from anaerobic digesters (liquid & solid feedstock), sewage sludge digesters, and landfill extraction wells. Its NDIR optical path incorporates temperature stabilization and dual-wavelength referencing to mitigate interference from water vapor absorption bands. Electrochemical sensors feature hydrophobic membrane filters and catalytic poison resistance for extended service life in H₂S-rich environments (up to 10,000 ppm). All configurations comply with IEC 60079-0 (explosive atmospheres), EN 61000-6-2/-4 (EMC immunity), and RoHS 2011/65/EU. Calibration traceability follows ISO/IEC 17025 via UKAS-accredited reference gases, with annual recalibration recommended (1–2× per year depending on exposure frequency and regulatory requirements).

Software & Data Management

Data acquisition and reporting are managed via proprietary Windows-compatible software delivered with each unit. Measurements export directly to Excel (.xlsx) or CSV formats via USB 2.0 interface, preserving full metadata including sensor status flags, calibration dates, and environmental compensation parameters. The software enables batch validation against ASTM D1945 (gas chromatography standard for natural gas), generates audit-ready reports compliant with GLP/GMP documentation practices, and supports 21 CFR Part 11–compatible electronic signatures when used with optional secure login modules. When docked into the COMBIMASS® GA-s station, the GA-m transitions to a semi-permanent configuration with automated sequence control, PLC integration (Modbus RTU/TCP), and local data buffering for network-outage resilience.

Applications

• Real-time biogas composition verification prior to CHP engine feeding (CH₄ ≥ 55 %, H₂S ≤ 200 ppm per VDI 3859)
• Landfill gas collection system optimization and fugitive emission quantification (EPA Method 21 support)
• Process troubleshooting in anaerobic digesters: detecting acidosis (low CH₄/high CO₂ ratio), sulfide inhibition, or nutrient imbalance
• Emergency leak detection and confined-space entry assessment (O₂ deficiency, H₂S toxicity, CH₄ explosion risk)
• Verification of biogas upgrading performance (e.g., amine scrubber or PSA output purity)
• Mobile QA/QC for biogas-to-grid injection points per EN 16726 Annex A

FAQ

What gas components can the GA-m measure simultaneously?

The base configuration measures CH₄ (0–100 % vol), CO₂ (0–100 % vol), and O₂ (0–25 % vol). Additional EC channels support H₂S (0–10,000 ppm), CO (0–2,000 ppm), H₂ (0–1,000 ppm), NH₃ (0–1,000 ppm), NO/NO₂/SO₂ (range-dependent), with up to 7 total active sensors.

Is the GA-m suitable for measuring high-humidity biogas without condensation damage?

Yes — its internal sample path includes heated components (maintained at >40 °C), hydrophobic filtration, and dew-point-compensated algorithms. No external dryer is required for routine use at ≤90 % RH.

How does the flow measurement module correct for variable gas composition?

Using real-time CH₄/CO₂/O₂ readings, the thermal mass flow sensor applies dynamic specific heat (Cp) and thermal conductivity (λ) corrections per ISO 6976 Annex B, eliminating errors from unmeasured N₂ or trace siloxanes.

Can the GA-m be used for regulatory reporting under EU MRV or US EPA GHG Reporting Program?

When operated with documented calibration records, ATEX certification, and traceable reference standards, its CH₄ and CO₂ outputs meet the uncertainty thresholds (<2 % rel.) required for Tier 2 reporting under both frameworks.

What maintenance contracts are available?

Comprehensive annual service agreements include sensor replacement, factory recalibration, firmware updates, and priority technical support — ensuring 365-day operational continuity with SLA-backed response times.