21GRD05 Met4H2 -- Metrology for the Hydrogen Supply Chain
Published November 26, 2025 | Version 1
Project deliverable Open

Technical report on the traceability chains for hydrogen flow metering with flow rates above 0.2 kg/min and three options for ensuring traceability from established primary standards for the 2030 European Industry and Hydrogen Community

Authors/Creators

  • 1. ROR icon Norwegian Metrology Service
  • 2. CESAME EXADEBIT
  • 3. ROR icon CESAME-EXADEBIT (France)
  • 4. ROR icon FORCE Technology (Denmark)
  • 5. ROR icon TÜV SÜD (United Kingdom)
  • 6. Federal Institute of Metrology METAS
  • 7. Endress+Hauser SICK
  • 8. ROR icon Federal Office of Metrology and Surveying

Description

This technical report presents the findings of an effort in the Met4H2 project to produce a traceability chain for hydrogen flow metering. Relevant flow metering points and requirements for fiscal metering points were found by surveying stakeholders involved in large-scale hydrogen applications.

A route for traceability is suggested. It involves the operation of newly developed primary standards to calibrate Critical Flow Venturi Nozzles (CFVN). The primary standards that are suggested are of the pVTt type, for which a concept study and a cost estimate is provided. The CFVNs are then combined in an array to bootstrap to larger flow rate ranges, detailed in an experimental protocol. The array allows for calibration of master meters.

Calibrations of CFVN with hydrogen gas were performed. Early results show that the discharge coefficient curve for hydrogen closely follows that of air, and both are within the uncertainty of the laboratory.

Files

21GRD05 Deliverable D4 - Metrological traceability chains for hydrogen flow metering.pdf

Files (1.3 MB)

Additional details

Funding

European Commission
Metrology for the hydrogen supply chain 21GRD05 Met4H2

Dates

Accepted
2026-01-10