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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Chemistry for Gases for United Kingdom (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty
(k = 2, 95 %) in %
Amount-of-substance fraction in µmol/mol Absolute expanded uncertainty
(k = 2, 95 %) in %
nitrogen or air methane 1.7994 to 5.00E+05 0.2 1.7994 to 5.00E+05 0.2
Mechanism(s) for measurement service delivery: PRGM and calibration
Approved on 30 June 2017.
Internal NMI service identifier: NPL/GA06