WP 1 – Flow metering

Flow metering – To develop a metrological framework for testing hydrogen meters used to measure the mass of hydrogen dispensed into a fuel cell vehicle from a refuelling station. The metrological and technical requirements stipulated in OIML R 139-1 and international standard SAE J2601 – Fueling Protocols for Light Duty Gaseous Hydrogen Surface Vehicles should be followed, with a target accuracy of 1% (WP1, M1-36).

There is a need for accurate measurement of hydrogen dispensed into the hydrogen vehicle. This is a very important measurement as it will allow the refuelling station operator to calculate the amount of hydrogen displaced into the vehicle to provide an accurate cost to the customer. No methodology currently exists for calibrating flow meters for hydrogen provided by refuelling stations (up to 875 bar and temperatures between -40 degrees Celcius and 85 degrees Celcius). OIML R 139-1 provides guidelines for the accuracy and approach for testing flow meters at refuelling stations, but due to the lack of experience with metering hydrogen at challenging refuelling conditions, no existing primary standard or verified method is available. Furthermore, due to hydrogen presenting very different characteristics compared to other gaseous fuels, OIML R 139-1 cannot be used for hydrogen as it is and a revision will be needed. Until these methods are developed there will be no traceability for hydrogen metering and thus no legal metrological control of hydrogen dispensers; this means that customers cannot be correctly charged and it is very likely that each station will have no real judgement of how much hydrogen they are dispensing.


Workpackage deliverables

All deliverables from workpackage 1 of the MetroHyVe project can be found in the table below. All available documents are located in the section DOWNLOADS.

NumberDescriptionTypePartnersDelivery date
A1.1.2 Report detailing the operating conditions of the surveyed HRS and estimating the uncertainty sources that would contribute to the accuracy of the hydrogen flow meter. Report Cesame, FORCE, JV, METAS, NEL, RISE, VSL Jan 2018 (M8)
A1.2.4 Paper including conclusions on the performance of the CMFs used in these activities under operation with alternative gases to hydrogen at densities between around 23 kg/m3 and 46 kg/m3. PaperNEL, Cesame, METAS, RISE Apr 2019 (M23)
A1.3.3 Paper on the results from performing high-pressure callibrations of CMFs using alternative test liquids. Paper RISE, NEL Jun 2019 (M25)
A1.4.5 Paper assessing the feasability of using the gravimetric method for the validation of at least one hydrogen fuelling station. PaperCesame, FORCE, METAS, RISE, VSL Dec 2019 (M31)
A1.4.8/1.D1Good practice guide describing calibration and validation of flow meters used at HRSs for quantifying hydrogen dispensed into vehicles.Good practice guideJV, Cesame, FORCE, METAS, NEL, Empa, RISEMay 2020 (M36)
A1.5.5 Report summarising the uncertainties achieved using the four calibration approaches. ReportMETAS, Cesame, Empa, FORCE, JV, NEL, RISE, VSL Jan 2020 (M32)
A1.5.6/1.D2Report recommending the development of primary test bench for performing traceable calibration of hydrogen flow meters at pressures up to 875 bar with target accuracy 1 % and following technical requirements stipulated in OIML R 139-1 and international standard SAE J2601.ReportCesameMar 2020 (M34)

Contact information Workpackage leader

Marc de Huu
E-mailaddress: Marc.deHuu@metas.ch
Telephone: (+41) 58 387 02 67