BS ISO BRITISH STANDARD 6145-8:2005 Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 8: Diffusion method ICS 71.040.40 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSISO6145-8:2005 National foreword This British Standard reproduces verbatim IS0 6145-8:2005 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PTI/15, Natural gas and gas analysis, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled "International Standards Correspondence Index", or by using the"Search" facility of theBSIElectronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not ofitself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 19 and a back cover. The BSI copyright notice displayed in this document indicates when the documentwaslastissued. Amendments issued since publication This British Standard was Licensed C Amd. No. Date published under the authority Comments of the Standards Policy and Strategy Committee 0n 5 September 2005 BSI 5 September 2005 ISBN0580464946 BS ISO 6145-8:2005 ISO INTERNATIONAL 6145-8 STANDARD First edition 2005-02-01 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods - Part 8: Diffusion method Analysedesgaz-Preparationdemélangesdegazpourétalonnagea I'aidedemethodesvolumetriques- Partie8:Methodepardiffusion Reference number ISO 6145-8:2005(E) = BSIS06145-8:2005 Contents Page Foreword Introductior 1 Scope 2 Normativereferences 3 Principle, 4 Reagents and materials. 5 Apparatus. 6 Procedure..... 6.1 Preliminarychecksandoperatingconditions 6.2 Determinationofmassloss.. 7 Expressionof results. 7.1 Calculation.... 7.2 Sourcesofuncertainty Annex A (informative)Practical example ofa diffusion cell calibrator configured for evaluating speed of response inahygrometer.. 10 AnnexB(informative)Exampleofperformancesof diffusion cellsfortolueneand trichloromethane... 13 Annex C (informative)Example of uncertainty calculations fora periodic weighing system.... .15 Bibliography 19 ili BSISO6145-8:2005 , (c) BSI Foreword Copy, IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies Uncontrolled International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:45:00 GMT+00:00 2006, The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent ISO 6145-8 was prepared by Technical Committee ISO/TC158,Analysis ofgases. mixturesusingdynamicvolumetricmethods: Part 1: Methods of calibration Part 2: Volumetric pumps Part 4: Continuous syringe