Critical Technical Advantages
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Fiscal Hydrogen Accuracy: The FLOWSIC610 is among the few ultrasonic meters globally certified to meet Accuracy Class 1 standards for hydrogen custody transfer. This ensures that financial transactions between producers and grid operators are based on legally compliant, high-precision data.
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Real-Time Purity Monitoring: A unique feature of the FLOWSIC610 is the integrated hydrogen purity indicator. By continuously monitoring the speed of sound, the device can detect contamination or changes in gas composition instantly, offering a layer of process control without expensive external analyzers.
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High-Velocity Performance: Hydrogen applications often require high flow rates to maintain throughput. The FLOWSIC610 is proven to maintain its fiscal accuracy at gas velocities up to 60 m/s (200 ft/s), allowing operators to maximize pipeline capacity.
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Energy Efficiency (Zero Pressure Drop): The ultrasonic transducers are mounted outside the flow stream, creating a completely unobstructed full-bore design. Unlike orifice plates or turbine meters, it creates no pressure loss, significantly reducing the energy costs associated with gas compression.
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Extreme Turndown Ratio: With a turndown ratio of 1:160, the meter handles the highly variable output characteristic of green hydrogen electrolyzers, which often fluctuate based on the availability of renewable energy sources.
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Future-Proof for Clean Energy: The device is designed to handle pure hydrogen as well as hydrogen blends, making it a versatile asset for existing natural gas grids transitioning to “H2-ready” status.
Detailed Technical Performance Matrix
| Specification | Technical Details and Ranges |
| Measured Medium | Pure Hydrogen (H2), Hydrogen/Natural Gas mixtures |
| Accuracy Class | Class 1 according to MID (Custody Transfer) |
| Nominal Pipe Sizes | DN50, DN80, DN100, DN150, DN200, DN250, DN300, DN400 |
| Max. Flow Velocity | 60 m/s (200 ft/s) |
| Turndown Ratio | Typical 1:160 |
| Design Pressure | Up to 100 bar (depending on flange rating) |
| Process Temperature | -40 °C to +80 °C (-40 °F to +176 °F) |
| Measurement Principle | Ultrasonic transit time (Multi-path) |
| Purity Monitoring | Real-time calculation based on Speed of Sound (SoS) |
| Diagnostics | Advanced self-monitoring via FLOWgate™ software |
Primary Applications
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Electrolyzer Export: Fiscal measurement of green hydrogen produced by water electrolysis.
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Pipeline Transport: Custody transfer points in national and regional hydrogen transport networks.
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Compressor Stations: Efficiency monitoring and flow control at high-pressure compression stages.
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Hydrogen Refueling Stations (HRS): Bulk supply measurement for heavy-duty vehicle refueling infrastructure.
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Industrial Feedstock: Precise measurement for refineries and chemical plants utilizing hydrogen in production.
