H₂S Analyzer & Gas Detectors — Biogas Plants
Continuous hydrogen sulfide monitoring for engine protection, corrosion control, scrubber performance, and personnel safety in biogas facilities.
Technician rule:
High H₂S alarms are usually caused by
scrubber saturation, poor moisture removal, or sample line condensation —
not sensor failure. Fix gas conditioning first.
Why H₂S Monitoring Is Mandatory
- Extremely toxic even at low ppm levels
- Severe corrosion of engines, compressors, pipelines
- Rapid engine oil degradation
- Reduced life of upgrading membranes
What the Analyzer Measures
- Hydrogen sulfide concentration (ppm / %)
- Scrubber performance trends
- High-H₂S alarm conditions
Measurement Types Used
- Online H₂S analyzer: continuous pipeline monitoring
- Fixed gas detector: engine room, digester, compressor area
- Portable detector: maintenance & confined space entry
Sensor Technologies
- Electrochemical (most common)
- UV fluorescence (high accuracy)
- Colorimetric tubes (spot checks only)
Typical Installation Locations
- Raw biogas line after digester
- Before & after H₂S scrubbers
- Engine and compressor rooms
- Gas upgrading skids
Maintenance & Calibration
- Regular calibration using certified H₂S gas
- Sensor replacement per vendor interval
- Strict moisture control in sample system
- Routine bump testing of safety detectors
Discussion
Share H₂S scrubber issues, sensor failures, false alarms, and best practices from biogas plants.