EN ISO 6145-11:2008

SLOVENSKI STANDARD
01-oktober-2008
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Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods
- Part 11: Electrochemical generation (ISO 6145-11:2005)
Gasanalyse - Herstellung von Kalibriergasgemischen mit Hilfe von dynamisch-
volumetrischen Verfahren - Teil 11: Elektrochemische Herstellung (ISO 6145-11:2005)
Analyse des gaz - Préparation des mélanges de gaz pour étalonnage à l'aide de
méthodes volumétriques dynamiques - Partie 11: Génération électrochimique (ISO 6145-
11:2005)
Ta slovenski standard je istoveten z: EN ISO 6145-11:2008
ICS:
71.040.40 Kemijska analiza Chemical analysis
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 6145-11
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2008
ICS 71.040.40
English Version
Gas analysis - Preparation of calibration gas mixtures using
dynamic volumetric methods - Part 11: Electrochemical
generation (ISO 6145-11:2005)
Analyse des gaz - Préparation des mélanges de gaz pour Gasanalyse - Herstellung von Kalibriergasgemischen mit
étalonnage à l'aide de méthodes volumétriques Hilfe von dynamisch-volumetrischen Verfahren - Teil 11:
dynamiques - Partie 11: Génération électrochimique (ISO Elektrochemische Herstellung (ISO 6145-11:2005)
6145-11:2005)
This European Standard was approved by CEN on 30 July 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6145-11:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
The text of ISO 6145-11:2005 has been prepared by Technical Committee ISO/TC 158 “Analysis of gases” of
the International Organization for Standardization (ISO) and has been taken over as EN ISO 6145-11:2008 by
Technical Committee CEN/TC N21 “Gaseous fuels and combustible gas” the secretariat of which is held by
CMC.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by February 2009, and conflicting national standards shall be withdrawn
at the latest by February 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 6145-11:2005 has been approved by CEN as a EN ISO 6145-11:2008 without any
modification.
INTERNATIONAL ISO
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 — Préparation des mélanges de gaz pour étalonnage
à l'aide de méthodes volumétriques dynamiques —
Partie 11: Génération électrochimique

Reference number
ISO 6145-11:2005(E)
©
ISO 2005
ISO 6145-11:2005(E)
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ii © ISO 2005 – All rights reserved

ISO 6145-11:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Procedure . 2
3.1 Principle. 2
3.2 Complementary gas. 2
3.3 Electrolytic systems for gas generation. 2
3.4 Apparatus . 3
3.4.1 Cell construction. 3
3.4.2 Current supply and gas flow control . 3
3.5 Gas mixture preparation . 3
3.5.1 Complementary gas. 3
3.5.2 Voltage supply . 3
3.5.3 Calculation of gas mixture content. 4
4 Uncertainty evaluation . 6
4.1 Introduction . 6
4.2 Sources of uncertainty. 6
4.2.1 Complementary gas flow . 6
4.2.2 Gas generation. 6
4.2.3 Absorption of generated gas in the cell electrolyte. 6
4.2.4 Effect of moisture content . 6
4.2.5 Effect of temperature. 6
4.2.6 Purity of electrolytic chemicals. 6
4.2.7 Impurities in complementary gas. 7
4.3 Uncertainty of volume fraction. 7
5 Electrochemical cell design. 7
Annex A (informative) Example of a commercial electrochemical cell . 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

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
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC 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. 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
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 6145-11 was prepared by Technical Committee ISO/TC 158, Analysis of gases.
ISO 6145 consists of the following parts, under the general title Gas analysis — Preparation of calibration gas
mixtures using dynamic volumetric methods:
⎯ Part 1: Methods of calibration
⎯ Part 2: Volumetric pumps
⎯ Part 4: Continuous syringe injection method
⎯ Part 5: Capillary calibration devices
⎯ Part 6: Critical orifices
⎯ Part 7: Thermal mass-flow controllers
⎯ Part 8: Diffusion method
⎯ Part 9: Saturation method
⎯ Part 10: Permeation method
⎯ Part 11: Electrochemical generation
Part 3 to ISO 6145, entitled Periodic injections into a flowing gas stream, has been withdrawn by Technical
Committee ISO/TC 158, Analysis of gases.
iv © ISO 2005 – All rights reserved

ISO 6145-11:2005(E)
Introduction
This part of ISO 6145 is one of a series of standards dealing with the various dynamic volumetric methods
used for the preparation of calibration gas mixtures.
Electrochemical gas generation can be used to produce calibration gas mixtures containing calibration
components which, because of their corrosive nature or low content, are unlikely to be stable in high-pressure
cylinders.
INTERNATIONAL STANDARD ISO 6145-11:2005(E)

Gas analysis — Preparation of calibration gas mixtures using
dynamic volumetric methods —
Part 11:
Electrochemical generation
1 Scope
This part of ISO 6145 spec
...