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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
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty
(k = 2, 95 %) in %
methane carbon monoxide 10 to 100 20
Mechanism(s) for measurement service delivery: Calibration
Internal NMI service identifier: NPL/68
This displays only one part of a multi-component CMC.

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
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty
(k = 2, 95 %) in %
methane carbon dioxide 10 to 100 20
Mechanism(s) for measurement service delivery: Calibration
Internal NMI service identifier: NPL/68
This displays only one part of a multi-component CMC.

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 %
methane methylacrylate 1 to 100 6 to 1 1 to 100 6 to 1
Mechanism(s) for measurement service delivery: PRGM and calibration
Approved on 08 July 2015.
Internal NMI service identifier: NPL/89

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 %
methane ethyl acrylate 1 to 100 6 to 1 1 to 100 6 to 1
Mechanism(s) for measurement service delivery: PRGM and calibration
Approved on 08 July 2015.
Internal NMI service identifier: NPL/90