electrolyser hydrogen oxygen monitoring

Verifying Trace O₂ Purity in PEM & Alkaline Electrolyser Hydrogen Streams — OMD-507

Water electrolysis produces separate hydrogen and oxygen streams using technologies such as proton exchange membrane (PEM) and alkaline electrolysis. Monitoring trace oxygen concentrations in the hydrogen product stream is essential for evaluating hydrogen purity, identifying potential oxygen crossover, and detecting changes in electrolyser performance.

Continuous oxygen analysis provides real-time measurement of oxygen impurities in the hydrogen stream, allowing operators to monitor process performance and maintain product quality. Oxygen measurements can also be integrated into plant control systems for continuous trending, configurable alarms, and automated process control functions.

Why Oxygen Monitoring Matters

Hydrogen and oxygen must remain effectively separated during the electrolysis process to maintain product purity and safe operating conditions. Changes in membrane integrity, diaphragm performance, seals, or operating conditions can lead to increased oxygen crossover into the hydrogen product stream.

Continuous trace oxygen monitoring allows operators to detect changes in oxygen concentration, identify developing process issues, and evaluate performance trends over time without relying solely on periodic manual sampling. Alarm setpoints and control limits should be established based on the electrolyser manufacturer’s specifications, process requirements, applicable standards, and facility-specific safety procedures.

Typical Oxygen Measurement Points & Applications

Electrolyser stack hydrogen outlet
Hydrogen dryer & purification system inlet
Hydrogen purification system outlet
Green hydrogen production & Processing skids
Electrolyser commissioning & performance testing
Membrane & diaphragm Integrity monitoring

Recommended Analyzer

OMD-507 Trace Oxygen Process Analyzer, CE

The OMD-507 provides continuous trace oxygen measurement in a compact and highly configurable analyzer platform. Multiple electronic configurations and sensor housing options allow the analyzer to be integrated into electrolyser skids, hydrogen production equipment, and plant control systems.

For extractive measurement, the OMD-507 can be configured with a flow-through sensor housing and appropriate sample conditioning components. Analog output and optional MODBUS communications allow oxygen measurements to be integrated with a PLC, DCS, or other process monitoring system.

Southland Sensing’s precision electrochemical oxygen sensor technology provides reliable trace oxygen measurement with minimal routine sensor maintenance.

Key Specifications for Electrolyser Hydrogen Use

Trace Oxygen Measurement Ranges: 0–10 ppm to 0–1,000 ppm O₂ (configuration dependent)
4–20 mA Analog Output for Process Control Integration
Precision Electrochemical Oxygen Sensor Technology
Sample Conditioning: Compatible with standard flow-through sample systems
Compact Design for OEM & Skid Integration

よくある質問

Why measure oxygen in the hydrogen product stream?

Trace oxygen measurement helps verify hydrogen purity and identify potential oxygen crossover from the electrolysis process. Continuous monitoring allows operators to track oxygen concentration trends and detect changes in electrolyser or purification system performance.

Where should the oxygen analyzer be installed?

Common measurement locations include the hydrogen outlet of the electrolyser stack and sampling points before or after hydrogen drying and purification equipment. The optimal location depends on the process design, operating conditions, and measurement objectives.

Need help specifying an analyzer for your Hydrogen application?n?

Our application engineers can help confirm the right model for your fill volume and blend range.

← Back to Hydrogen Gas Analysis Applications

All Application Notes →