Biogas Composition Analyzer

Continuous measurement of methane, carbon dioxide, hydrogen sulfide and oxygen to ensure gas quality, engine protection and safe biogas plant operation.

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Technician rule: If composition trends are unstable, fix sampling, moisture removal, and pressure stability first. Analyzer electronics rarely cause drifting composition.

Gas Components Measured

  • Methane (CH₄): energy content / calorific value
  • Carbon dioxide (CO₂): dilution of fuel gas
  • Hydrogen sulfide (H₂S): corrosion and toxicity
  • Oxygen (O₂): air ingress & explosion risk

Measurement Technologies

  • CH₄ / CO₂: NDIR (Non-Dispersive Infrared)
  • H₂S: Electrochemical or UV-Fluorescence
  • O₂: Electrochemical or Paramagnetic

Typical Installation Locations

  • Raw biogas line after digester
  • Before and after H₂S scrubbers
  • Upstream of engines or boilers
  • Before CBG / Bio-CNG upgrading units

Why Composition Measurement Is Critical

  • Prevents engine knocking and corrosion
  • Avoids explosive mixtures due to oxygen ingress
  • Optimizes H₂S removal systems
  • Improves plant efficiency and uptime

Common Plant Problems

  • High H₂S damaging engines and compressors
  • Low methane reducing power output
  • Oxygen ingress from leaking digesters
  • Condensation affecting analyzer accuracy

Maintenance & Calibration

  • Calibration using certified span gases
  • Effective moisture removal in sample system
  • Periodic sensor replacement (H₂S cells)
  • Routine leak and flow stability checks

Discussion

Share biogas composition issues, methane fluctuations, oxygen ingress cases, and sampling best practices.