Trace Oxygen Monitoring in Landfill Gas & Methane Recovery
Detecting Air Intrusion in Vacuum-Operated Collection Systems — OMD-625
Landfill gas collection systems operate under vacuum to draw methane and carbon dioxide from the waste mass, which makes them prone to air intrusion through well leaks, damaged piping, or over-application of vacuum at individual wellheads. Oxygen entering the collection system dilutes methane content and, at higher concentrations, creates the potential for an explosive gas mixture inside the header.
The OMD-625 online trace oxygen analyzer lets landfill operators continuously monitor oxygen at the collection header and key wellheads, catching air intrusion before it becomes a safety or equipment issue.
- Landfill Gas Collection
- Air Intrusion Detection
- Flare/Engine Protection
- Methane Recovery Safety
Why Trace Oxygen Monitoring Matters
Excess oxygen in a landfill gas collection system is a leading indicator of air intrusion, which both reduces the fuel value of the recovered gas and raises the risk of reaching an explosive mixture within the collection header, flare, or engine fuel train. Continuous trace oxygen monitoring supports well field balancing and protects downstream flares and engine-generators from damaging combustion conditions.
Where It's Used
- Collection header trace oxygen monitoring — system-wide indicator of air intrusion
- Individual wellhead balancing — identifying wells that need vacuum adjustment
- Flare inlet gas quality checks — confirming safe combustion conditions
- Engine/generator fuel gas protection — preventing damage from off-spec fuel gas
Recommended Analyzer
The OMD-625 provides continuous, drift-resistant trace oxygen measurement suited to the variable, often wet conditions found in landfill gas collection systems.
Deployed at the header or at individual wellheads, the OMD-625 feeds continuous data back to the control system, supporting routine well field balancing and early detection of collection system leaks.
- Continuous Online Output
- Wet Gas Tolerant
- 4-20 mA / HART Output
- Field-Rated Enclosure
主な仕様
- Range: 0 – 25% O2, covering trace intrusion through significant air ingress
- Sensor technology: suited to the variable moisture and trace gas content of landfill gas
- Output: 4-20 mA and HART for integration with SCADA well field control systems
- Response time: fast enough to support routine wellhead balancing checks
- Enclosure: weatherproof housing for outdoor landfill site conditions
よくある質問
Trace oxygen measurement provides a direct indication of oxygen contamination or crossover into the hydrogen stream. Trending the oxygen concentration can help operators identify changes in electrolyser or purification system performance.
A common measurement point is the hydrogen product stream downstream of the electrolyser stack. Additional measurement points may be used before or after drying and purification equipment depending on the process design and monitoring objectives.
Alarm and control limits should be determined based on the electrolyser manufacturer’s specifications, process conditions, applicable standards, and the facility’s safety requirements rather than using a universal oxygen alarm value.
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