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Biogas (pH & Oxygen)

Biogas & RNG Measurement Solutions - Application Note Download

Improve biogas production efficiency with accurate oxygen and pH measurement.

Biogas generated from landfills, wastewater treatment plants, and agricultural waste contains methane, CO₂, moisture, H₂S, oxygen, and other trace gases. Its composition varies by feedstock and requires purification before use in energy systems or upgrading to pipeline quality renewable natural gas (RNG). Accurate oxygen and pH monitoring are essential for protecting digester performance, preventing oxygen inhibition, reducing corrosion, and verifying the effectiveness of H₂S/CO₂ scrubbing stages.

Why These Measurements Matter

  • Prevent digester imbalance: Methanogenic bacteria are highly sensitive to oxygen, and even small leaks reduce methane yield.
  • Maintain optimal pH: Stable pH directly impacts methane generation and overall digester performance.
  • Reduce corrosion and downtime: Moisture mixed with CO₂ or H₂S produces acidic condensation that damages equipment.
  • Meet RNG quality standards: Upgraded biogas must exceed 95% methane for pipeline injection.

Featured Measurement Solutions

  • OXYvisor Optical Oxygen Analyzer– Accurate %O₂ and traceppm oxygen measurement; unaffected by CO₂, H₂S, NH₃, or moisture.
  • SafeTap II– Can be installed in situ to eliminate issues associated with sample wet biogas for oxygen measurement.
  • 547 / 546 pH Sensors– Rugged, longlife sensors built for harsh anaerobic digesters and wet biogas environments.

What's Inside the Application Note

  • Key measurement points in biogas production and purification
  • Safety considerations related to oxygen ingress and explosive limits
  • Overview of moisture removal, H₂S scavenging, and CO₂ scrubbing technologies
  • Best practices for monitoring raw biogas and upgraded RNG streams
  • Sensor recommendations for wet digester gas and clean biomethane applications

Biogas Application Note (PDF)

Get the full technical guide, including biogas purification steps, measurement strategies, and recommended sensor technologies.