Water vapour is one of the key parameters for hydrogen quality in the supply chain. The requirement to monitor water vapour is a cross-cutting issue over the entire hydrogen supply chain (i.e. transport applications, production, injection into gas network or for heat application). Recent studies (e.g., FCH-JU HYDRAITE, 16ENG01 MetroHyVe) highlighted the challenges related to these measurements, with one of the main challenges to achieve or access a reliable and traceable water vapour standard in the range of 0.5 µmol mol-1 to 50 µmol mol-1 in hydrogen.
In this project, the participants organised the first-ever comparison involving dynamic generators of humidity in hydrogen. The objective was to provide the hydrogen community with reliable and proven systems to generate reference water vapour values and provide confidence in the use of primary humidity standards with hydrogen.
This report summarises the results of this pilot intercomparison and recommendations for future comparisons of this type based upon the lessons learnt.
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