ISO INTERNATIONAL STANDARD 6145-11 First edition 2005-10-15 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods - Part 11: Electrochemical generation Analyse des gaz - Preparation des mélanges de gaz pour étalonnage a I'aide de méthodes volumétriques dynamiques - Partie 11: Génération électrochimique Reference number ISO 6145-11:2005(E) @ ISO 2005 Copyright International Organization for Standardization ted without license from IHS Not for Resale ISO 6145-11:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF fle can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. @ISO2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ".."". Copyightinteratinal organization for Standardization @ ISO 2005 - All rights reserved mitted without license from IHS Not for Resale ISO 6145-11:2005(E) Contents Page Foreword. IV Introduction 1 Scope 2 Normative references 3 Procedure 3.1 Principle... 3.2 Compiementary gas.. 3.3 Electrolytic systems for gas generation.... 3.4 Apparatus.... 3.4.1 Cell construction... 3.4.2 Current supply and gas flow control. 3.5 Gas mixture preparation .... 3.5.1 Complementary gas... 3.5.2 Voltage supply .... 3.5.3 Calculation of gas mixture content. 4 Uncertainty evaluation 4.1 Introduction. 4.2 Sources of uncertainty . 4.2.1 Complementary gas flow, 4.2.2 Gas generation...... 4.2.3 Absorption of generated gas in the cell electrolyte ... 4.2.4 Effect of moisture content... 4.2.5 Effect of temperature...... 4.2.6 Purity of electrolytic chemicals... 4.2.7 Impurities in complementary gas... 4.3 Uncertainty of volume fraction... 5 Electrochemical cell design... AnnexA(informative)Exampleofacommercialelectrochemicalcell.. 9 Annex B (informative) Schematics of electrolytic cells used for gas generation... 11 Annex C (informative) Schematic of electrical supply to gas generation cell... 12 Annex D (informative) Decomposition voltages of solutions between smooth platinum electrodes... 13 Bibliography ... 14 Copyright International Organizaion for stadardizalon ghts reserved ii without license from IHS Not for Resale ISO 6145-11:2005(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with isO, also take part in the work. IsO collaborates closely with the InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. 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. Pub