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NPL at the Royal Institution of Great Britain

Gas reference materials

Hydrogen primary reference gas mixtures

Supporting quality assurance for hydrogen

NPL produces range of reference gas standards for the hydrogen industry. These mixtures, or primary reference materials, are primary realisations of the mole as gas mixtures at the top of the traceability hierarchy and are provided with some of the lowest uncertainties available worldwide. Our primary reference gas mixtures (PRGMs) are prepared gravimetrically from pure components and are validated using our suite of state-of-the-art gas analysers. We can provide the following levels of impurities in a hydrogen PRGM:

Our primary reference gas mixtures (PRGMs) are prepared gravimetrically from pure components and are validated using our suite of state-of-the-art gas analysers. We can provide the following levels of impurities in a hydrogen PRGM:

Component

Amount fraction / µmol mol-1 (ppm)

Water*

1 - 100

Total hydrocarbons*

1 - 100

Oxygen*

1 - 1000

Helium*

20 - 3000

Nitrogen*

1 - 1000

Argon*

1 - 1000

Carbon dioxide*

1 - 1000

Carbon monoxide*

0.1 - 1000

Total sulphur compounds*

1 - 1000

Formaldehyde***

2 - 10

Ammonia

1 - 1000

Other compounds

Please contact us


* UKAS accreditation available for these components
** Lower amount fractions can be detected upon request
*** Very low stability due to formaldehyde-hydrogen reaction


When purchasing hydrogen gas standards from NPL, you will receive the following:

  • Customised PRGMs containing the desired amount fractions of impurities and matrix gas in a 10 L cylinder
  • Validation of your mixture against our existing suite of PRGMs (to ensure traceability)
  • PRGMs with exceptionally low uncertainties assigned for each impurity
  • Stability data to ensure your mixture will remain unchanged for the stability period stated on the cylinder
  • Our NPL logo which proves that your PRGM was provided by a National Metrology Institute
  • UKAS calibration accreditation is available for the compounds highlighted in the above table

Ordering PRGMs from NPL

To obtain a quotation for a hydrogen PRGM in a 10 L cylinder, please contact us stating the following:

  • Composition (with required uncertainties) of the hydrogen PRGM you need
  • Cylinder pressure (usually 100 bar)
  • Cylinder valve type

Contact us

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Contact our Customer Services team on +44 20 8943 7070