EN ISO 6145-10:2008

Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 10: Permeation method (ISO 6145-10:2002)

This part of ISO 6145 specifies a dynamic method using permeation membranes for the preparation of calibration
gas mixtures containing component mole fractions ranging from 10−9 and 10−6. A relative expanded uncertainty of
2,5 % of the component mole fraction can be achieved using this method. In the mole fraction range considered, it
is difficult to maintain some gas mixtures, for example in cylinders, in a stable state. It is therefore desirable to
prepare the calibration gas immediately before use, and to transfer it by the shortest possible path to the place
where it is to be used. This technique has been successfully applied in generating low content calibration gas
mixtures of, for example, sulfur dioxide (SO2), nitrogen dioxide (NO2) and benzene (C6H6) in air.
If the carrier gas flow is measured as a gas mass-flow, the preparation of calibration gas mixtures using permeation
tubes is a dynamic-gravimetric method which gives contents in mole fractions.

Gasanalyse - Herstellung von Kalibriergasgemischen mit Hilfe von dynamisch-volumetrischen Verfahren - Teil 10: Permeationsverfahren (ISO 6145-10:2002)

Dieser Teil der ISO 6145 legt ein dynamisches Verfahren unter Verwendung von Permeationsmembranen zur
Herstellung von Kalibriergasgemischen mit Stoffmengenanteilen der Komponenten im Bereich von 10–9 bis
10–6 fest. Mit diesem Verfahren lässt sich eine relative erweiterte Messunsicherheit von 2,5 % des Stoffmengenanteils
der Komponente erreichen. In dem betrachteten Bereich des Stoffmengenanteils ist es bei
manchen Gasgemischen schwierig, sie beispielsweise in Druckgasflaschen in einem stabilen Zustand zu
bewahren. Daher ist es erstrebenswert, solche Gasgemische unmittelbar vor dem Gebrauch herzustellen und
sie auf dem kürzestmöglichen Weg zur Verbrauchsstelle zu leiten. Diese Technik wurde erfolgreich eingesetzt
bei der Herstellung von Kalibriergasgemischen niedrigen Gehalts von beispielsweise Schwefeldioxid (SO2),
Stickstoffdioxid (NO2) und Benzol (C6H6) in Luft.
Wird der Grundgasstrom als Massenstrom gemessen, dann handelt es sich bei der Herstellung von Kalibriergasgemischen
mit Hilfe von Permeationsröhrchen um ein dynamisch-gravimetrisches Verfahren, das
Gehalte in Stoffmengenanteilen liefert.

Analyse des gaz - Préparation des mélanges de gaz pour étalonnage à l'aide de méthodes volumétriques dynamiques - Partie 10: Méthode par perméation (ISO 6145-10:2002)

La présente partie de l'ISO 6145 spécifie une méthode dynamique utilisant des membranes de perméation pour la
préparation de mélanges de gaz pour étalonnage, dont la teneur en constituants est en général comprise entre
10−9 et 10−6 en fraction molaire. En appliquant cette méthode, on obtient une incertitude relative étendue de 2,5 %
de la fraction molaire du constituant. Dans la gamme des fractions molaires considérée, il est difficile de maintenir
stables certains mélanges de gaz (notamment en bouteilles). Aussi est-il nécessaire de préparer le gaz pour
étalonnage immédiatement avant emploi et de le transférer par le plus court chemin sur son lieu d'utilisation. Cette
technique a notamment été appliquée avec succès pour générer des mélanges de gaz à faible teneur pour
étalonnage, par exemple, de dioxyde de soufre (SO2), de dioxyde d'azote (NO2) et de benzène (C6H6) dans l'air.
Si le débit de gaz vecteur est mesuré sous forme de débit massique, la préparation des mélanges de gaz pour
étalonnage à l'aide de tubes à perméation est une méthode gravimétrique dynamique qui donne les teneurs en
fractions molaires.

Analiza plinov - Priprava kalibracijske plinske zmesi z uporabo dinamičnih volumetričnih metod - 10. del: Metoda pronicanja (ISO 6145-10:2002)

General Information

• Status: Published
• Publication Date: 19-Aug-2008
• ICS: 71.040.40 - Chemical analysis
• Technical Committee: CEN/TC 238 - Test gases, test pressures and categories of appliances
• Drafting Committee: CEN/TC 238 - Test gases, test pressures and categories of appliances
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 20-Aug-2008
• Due Date: 28-Sep-2009
• Completion Date: 20-Aug-2008
• Ref Project: SIST EN ISO 6145-10:2008 - Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 10: Permeation method (ISO 6145-10:2002)

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2008
$QDOL]DSOLQRY3ULSUDYDNDOLEUDFLMVNHSOLQVNH]PHVL]XSRUDERGLQDPLþQLK
YROXPHWULþQLKPHWRGGHO0HWRGDSURQLFDQMD,62
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods
- Part 10: Permeation method (ISO 6145-10:2002)
Gasanalyse - Herstellung von Kalibriergasgemischen mit Hilfe von dynamisch-
volumetrischen Verfahren - Teil 10: Permeationsverfahren (ISO 6145-10:2002)
Analyse des gaz - Préparation des mélanges de gaz pour étalonnage à l'aide de
méthodes volumétriques dynamiques - Partie 10: Méthode par perméation (ISO 6145-
10:2002)
Ta slovenski standard je istoveten z: EN ISO 6145-10:2008
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 6145-10
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2008
ICS 71.040.40
English Version
Gas analysis - Preparation of calibration gas mixtures using
dynamic volumetric methods - Part 10: Permeation method (ISO
6145-10:2002)
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 10:
dynamiques - Partie 10: Méthode par perméation (ISO Permeationsverfahren (ISO 6145-10:2002)
6145-10:2002)
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 6145-10:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
The text of ISO 6145-10:2002 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 6145-10:2008 by
Technical Committee CEN/SS 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 6145-10:2002 has been approved by CEN as a EN ISO 6145-10:2008 without any
modification.
INTERNATIONAL ISO
STANDARD 6145-10
First edition
2002-02-01
Gas analysis — Preparation of calibration
gas mixtures using dynamic volumetric
methods —
Part 10:
Permeation method
Analyse des gaz — Préparation des mélanges de gaz pour étalonnage à
l'aide de méthodes volumétriques dynamiques —
Partie 10: Méthode par perméation

Reference number
ISO 6145-10:2002(E)
©
ISO 2002
ISO 6145-10:2002(E)
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ii © ISO 2002 – All rights reserved

ISO 6145-10:2002(E)
Contents Page
Foreword.iv
Introduction.v
1 Scope .1
2 Normative reference.1
3 Principle.1
4 Reagents and materials .2
5 Apparatus .2
6 Procedure .5
6.1 Preliminary checks and operating conditions.5
6.2 Determination of mass loss.6
7 Expression of results .7
7.1 Calculation .7
7.2 Sources of uncertainty.8
7.3 Estimation of uncertainties.10
7.4 Example calculation of uncertainties .13
Annex A (informative) Example of uncertainty calculation for a two-pan continuous weighing system.14
Bibliography.16

ISO 6145-10:2002(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 3.
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 part of ISO 6145 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 6145-10 was prepared by Technical Committee ISO/TC 158, Analysis of gases.
It cancels and replaces ISO 6349:1979 which has been technically revised.
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 injection method
 Part 5: Capillary calibration devices
 Part 6: Critical orifices
 Part 7: Thermal mass-flow controllers
 Part 9: Saturation method
 Part 10: Permeation method
Diffusion will be the subject of a future part 8 to ISO 6145. 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.
Annex A of this part of ISO 6145 is for information only.
iv © ISO 2002 – All rights reserved

ISO 6145-10:2002(E)
Introduction
This part of ISO 6145 is one of a series of standards dealing with various dynamic volumetric methods used for the
preparation of calibration gas mixtures.
INTERNATIONAL STANDARD ISO 6145-10:2002(E)

Gas analysis — Preparation of calibration gas mixtures using
dynamic volumetric methods —
Part 10:
Permeation method
1 Scope
This part of ISO 6145 specifies a dynamic method using permeation membranes for the preparation of calibration
−9 −6
gas mixtures containing component mole fractions ranging from 10 and 10 . A relative expanded uncertainty of
2,5 % of the component mole fraction can be achieved using this method. In the mole fraction range considered, it
is difficult to maintain some gas mixtures, for example in cylinders, in a stable state. It is therefore desirable to
prepare the calibration gas immediately before use, and to transfer it by the shortest possible path to the place
where it is to be used. This technique has been successfully applied in generating low content calibration gas
mixtures of, for example, sulfur dioxide (SO ), nitrogen dioxide (NO ) and benzene (C H ) in air.
2 2 6 6
If the carrier gas flow is measured as a gas mass-flow, the preparation of calibration gas mixtures using permeation
tubes is a dynamic-gravimetric method which gives contents in mole fractions.
2 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of
this part of ISO 6145. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 6145 are encouraged to investigate the
possibility of applying the most recent edition of the normative document indicated below. For undated references,
the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of
currently valid International Standards.
ISO 6145-1, Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 1:
Methods of calibration
3 Principle
The calibration component [for example SO , NO , ammonia (NH ), benzene, toluene, xylene] is permeated
2 2 3
through an appropriate membrane into the flow of a carrier gas, i.e. the complementary gas of the mixture obtained.
The calibration component, of known purity, is contained in a tube, which is itself contained in a temperature-
controlled vessel. This vessel is purged at a known and controlled flow rate by the carrier gas. The composition of
the mixture is determined from t
...