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Workshop on Critical Flow Nozzle Calibration

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Workshop on the latest knowledge and good practice on calibration of critical flow nozzles.

9 December 2022

10:00 - 16:30 (UTC+01:00) Amsterdam, Berlin, Bern, Rom, Stockholm, Wien



  • ISO 9300 requirements
  • Dimensional calibrations
  • Flow calibrations using primary standards
  • Modelling approaches including Computational Fluid Dynamics (CFD)
  • Transferability of calibrations with alternative gases to hydrogen
  • New equation of state and calculation of critical flow function (C*) for hydrogen



  • Marc MacDonaldHead of Hydrogen Metrology, TÜV SÜD National Engineering Laboratory
  • Marc de HuuHead of Laboratory, Flow & Hydrometry, METAS
  • Hamidou SoumareR&D Engineer, Gas Flow Measurement, CESAME-EXADEBIT
  • Bodo MickanHead of High Pressure Gas Working Group, PTB
  • Gregor Bobovnik Assistant Professor, University of Ljubljana, Faculty of Mechanical Engineering
  • Sebastian WeissDoctoral student, PTB
  • Roland SpanProfessor, Chair of Thermodynamics, Ruhr University Bochum