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A high accuracy dilution system for generating low concentration reference standards of reactive gases
Affiliation:1. Institute of Engineering & Technology, Dr. Shakuntala Misra National Rehabilitation University, Lucknow, India;2. Material Science Research Laboratory, Department of Physics, University of Lucknow, Lucknow, India;1. School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;2. Smiths Detection, Century House, Maylands Avenue, Hemel Hempstead, Hertfordshire HP2 7DE, UK;3. Institut für Atemgasanalytik, Leopold-Franzens-Universität Innsbruck, Rathausplatz 4, A-6850 Dornbirn, Austria;1. Servicio de Nefrología, Hospital Universitario y Politécnico La Fe, Valencia, Spain;2. Unidad de Gastroenterología, Servicio de Medicina Digestiva, Hospital Universitario y Politécnico La Fe, Valencia, Spain;1. Analytical Science Division, National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK;2. Environmental Research Group, King''s College London, 150 Stamford Street, London SE1 9NH, UK;1. School of Science, JiangNan University, 214122 Wuxi, China;2. School of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China
Abstract:We have developed a unique dynamic dilution system for generating high accuracy reference standards of reactive gases at concentrations which are unstable in high pressure cylinders. It uses state of the art ‘Molbloc’ flow elements and is capable of generating adjustable reference standards with an estimated relative expanded uncertainty lower than 1%. This is a significant development, improving the accuracy of primary reference gas mixtures used to provide and disseminate traceability for measurements of many key gaseous air pollutants.
Keywords:Gas metrology  Gas flow dilutor  Dynamic standard  Molbloc
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