Schedule of Accreditation issued by United Kingdom Accreditation Service 2 Pine Trees, Chertsey Lane, Staines-upon-Thames, TW18 3HR, UK BOC Ltd Issue No: 015 Issue date: 22 February 2021 The Priestley Centre Contact: Dr K D Cleaver 10 Priestley Road Tel: +44 (0) 7825 844998 The Surrey Research Park E-Mail: [email protected] Guildford Website: www.boconline.co.uk 4183 Surrey GU2 7XY Accredited to ISO 17034:2016 Reference material production performed by the locations specified below Locations covered by the organisation and their relevant activities Locations: Location details Activity Location code Address Local contact Head Office A The Priestley Centre Dr K D Cleaver 10 Priestley Road Guildford The Surrey Research Park Tel: +44 (0) 7825 844998 Guildford Email: [email protected] Surrey GU2 7XY Address Local contact MOT Mixture B 28 Deer Park Road Ms Akina Carey Binary Gas Mixtures London Ethanol/Air Mixtures Morden SW19 3UF Tel: +44 (0) 7785 454036 Email: [email protected] Address Local contact Natural Gas Mixtures C Hobson Way Mr Walter Branowsky Multi-component Gravimetric Gas Stallingborough Mixtures Immingham Immingham Tel: +44 (0)1469 577977 NE Lincolnshire Fax: +44 (0)1469 576493 DN41 8DZ Email: [email protected] Assessment Manager: RC1 Page 1 of 3 Schedule of Accreditation issued by United Kingdom Accreditation Service 2 Pine Trees, Chertsey Lane, Staines-upon-Thames, TW18 3HR, UK BOC Ltd 4183 Issue No: 015 Issue date: 22 February 2021 Accredited to ISO 17034:2016 Reference material production performed by the locations specified DETAIL OF ACCREDITATION Matrix / Artefact Property Value(s) / Identity / Characterisation Type* Location Characterisation Range Procedure / (CRM / RM) Code Technique Analysed Gases Quaternary gas Carbon monoxide (3.5 %) Measurement by a CRM B mixture Carbon dioxide (14 %) single, primary, Propane (2000 ppm) definitive method at Nitrogen (balance) BOC Binary gas Propane/air (1.7 ppm to 1000 ppm) Measurement by a CRM B mixtures Carbon monoxide/nitrogen (2 ppm to 10 %) single, primary, Carbon monoxide/air (2 ppm to 6.25 %) definitive method at Carbon dioxide/nitrogen (0.1 % to 15 %) BOC Nitric oxide/nitrogen (2 ppm to 1 %) Oxygen/nitrogen (0.5 % to 25 %) Sulphur dioxide/nitrogen (10 ppm to 3000 ppm) Ethanol in air Ethanol/air Measurement by a CRM B calibration standard 35 g per 100 ml air (191.4 ppm) single, primary, for evidential 22 g per 100 ml air (120.3 ppm) definitive method at breath testing 9 g per 100 ml air (49.2 ppm) BOC Natural gas Methane (55 % to 100 %) Measurement by a CRM C Ethane (0.008 % to 11 %) single, primary, Propane (0.01 % to 8 %) definitive method at i-Butane (0.004 % to 1.2 %) BOC. Certification of n-Butane (0.004 % to 1.3 %) Natural Gas i-Pentane (0.003 % to 0.4 %) mixtures against n-Pentane (0.003 % to 0.4 %) nationally traceable neo-Pentane (0.002 % to 0.4 %) gas reference Hexane (0.0009 % to 0.35 %) standards using gas Nitrogen (0.02 % to 20.4 %) chromatography in Carbon Dioxide (0.09 % to 12 %) accordance with ISO 6143:2006 Calculated values for: Calculation of C Gross Calorific Value physical properties Net Calorific Value in accordance with Relative density BS EN Density ISO 6976:2005 Gross Wobbe Index or BS EN Net Wobbe Index ISO 6976:2016 Mean Molecular Mass Compression Factor Assessment Manager: RC1 Page 2 of 3 Schedule of Accreditation issued by United Kingdom Accreditation Service 2 Pine Trees, Chertsey Lane, Staines-upon-Thames, TW18 3HR, UK BOC Ltd 4183 Issue No: 015 Issue date: 22 February 2021 Accredited to ISO 17034:2016 Reference material production performed by the locations specified Matrix / Artefact Property Value(s) / Identity / Characterisation Type* Location Characterisation Range Procedure / (CRM / RM) Code Technique Analysed Gases (cont’d) Gas mixtures C1 to C3 (0.0008 % to 100 %) Measurement by a CRM C C4 (0.001 % to 50 %) single, primary, C5 (0.001 % to 9 %) definitive method at C6 (0.001 % to 1.5 %) BOC C7 (0.001 % to 0.5 %) C8 (0.001 % to 0.2 %) Multi-component C9 (0.001 % to 0.2 %) gaseous mixtures C10 (0.001 % to 0.05 %) prepared by Benzene (0.001 % to 1 %) gravimetry in Toluene (0.001 % to 0.4 %) accordance with ISO Xylenes, m, p and o (0.001 % to 0.1 %) 6142:2006 with Argon (0.1 % to 100 %) analytical validation Carbon dioxide (0.03 % to 100 %) against traceable Carbon monoxide (0.001 % to 100 %) standards Helium (0.1 % to 100 %) Hydrogen (0.08 % to 100 %) Where more than 5 Nitrogen (0.1 % to 100 %) components fall Oxygen (0.05 % to 100 %) within the above scope for Natural gas, certification shall be using nationally traceable gas reference standards END *Type CRM = Certified Reference Material(s) RM = Reference Material(s) Refer to ISO 17034 for full definitions Assessment Manager: RC1 Page 3 of 3 .