Trace Oxygen Analysis

Trace Oxygen Analysis for Green Hydrogen Purity Verification — OMD-625

Green hydrogen, produced through water electrolysis powered by renewable electricity, is increasingly used in fuel cells, industrial processes, and energy storage applications. Many of these applications require high-purity hydrogen with stringent limits on oxygen contamination. Continuous trace oxygen analysis helps producers verify product quality, monitor purification performance, and detect unwanted oxygen impurities.

Bu Southland Sensing OMD-625 Trace Oxygen Analyzer provides continuous measurement of low-level oxygen concentrations in hydrogen gas streams. Designed for demanding industrial applications, the OMD-625 supports hydrogen purity verification, process monitoring, and quality control where reliable trace oxygen measurement is essential.

Why Verification Matters

Hydrogen intended for fuel cells, pipeline blending, and other high-purity applications must meet specific gas quality requirements, including limits on oxygen contamination. Excess oxygen can affect downstream equipment performance, product quality, and process reliability.

Continuous trace oxygen monitoring allows hydrogen producers to detect oxygen contamination, evaluate electrolyzer and purification system performance, and verify that oxygen concentrations remain within specified limits. Real-time measurement also supports process control, quality assurance, and early identification of changes in hydrogen purity.

Where It’s Used

Recommended Analyzer

OMD-625 Trace Oxygen Process Analyzer, CE

Designed for continuous trace oxygen measurement in high-purity industrial gas streams, the OMD-625 combines a precision electrochemical sensor with a rugged process-grade enclosure, giving green hydrogen producers dependable, low-maintenance verification of product gas purity.

For green hydrogen applications, the OMD-625 is typically installed downstream of the electrolyzer and purification train, providing continuous trend data and configurable alarms to confirm the hydrogen stream consistently meets purity specifications before it reaches storage or offtake.

Key Specifications for Green Hydrogen Use

Trace Oxygen Measurement: 0–10, 0–100, 0–1,000 and 0–10,000 PPM O₂
Sensor Technology: Precision Electrochemical Fuel Cell, Compatible with Hydrogen Background Gas
Hazardous Area Certification: ATEX & IECEx, Zone 1, IIB + H₂
Analog Output: Isolated 4–20 mA for Process Control Integration
Sample Flow: 0.5–5.0 SCFH

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Why is trace oxygen monitoring important in green hydrogen production?

Trace oxygen monitoring helps verify hydrogen product quality, detect oxygen crossover from the electrolysis process, and evaluate downstream purification performance. Continuous measurement allows operators to identify changes in oxygen concentration before they affect product quality.

What oxygen concentration is acceptable in fuel-cell-grade hydrogen?

Acceptable oxygen concentrations depend on the applicable hydrogen purity specification and end-use requirements. Standards such as ISO 14687 establish impurity limits for certain hydrogen applications. The oxygen analyzer measurement range and alarm setpoints should be selected according to the required specification.

Can the OMD-625 measure trace oxygen directly in hydrogen gas?

Yes. The OMD-625 utilizes electrochemical oxygen sensor technology suitable for measuring trace oxygen concentrations in a hydrogen background gas. Proper sample conditioning, pressure regulation, and flow control are important for accurate and reliable measurement.

Need Help Specifying an Analyzer for Your Green Hydrogen Process?

Our application engineers can help confirm the right model for your purity and flow requirements.

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