SIST EN ISO 6145-5:2011
(Main)Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 5: Capillary calibration devices (ISO 6145-5:2009)
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 5: Capillary calibration devices (ISO 6145-5:2009)
This part of ISO 6145 is one of a series of International Standards dealing with the various dynamic volumetric techniques used for the preparation of calibration gas mixtures. This part specifies a method for the continuous production of calibration gas mixtures from pure gases or gas mixtures using capillary calibration devices in single or multiple combinations (gas dividers). Single capillary systems can be used to provide gas mixtures where the minor component is in the range of volume fractions from 10-8 to 0,5. The relative expanded uncertainty of this technique is less than ±2 % (k = 2) relative. This application is used in industrial gas mixing panels for the production of specific gas atmospheres. Gas dividers can be used to divide gas mixtures prepared from gases or gas mixtures into controlled proportions by volume. These devices are capable of dilutions in the range of volume fractions from 0,000 5 to 0,9 of the primary gas concentration with a relative repeatability of better than 0,5 %. Traceability of the gas mixtures produced by a gas divider is achieved by comparison of a mixture with gas mixtures related to national or international gas standards. An example is given in Annex A.
Gasanalyse - Herstellung von Kalibriergasgemischen mit Hilfe von dynamisch-volumetrischen Verfahren - Teil 5: Kapillardosierer (ISO 6145-5:2009)
Dieser Teil von ISO 6145 ist Teil einer Reihe Internationaler Normen, die die verschiedenen dynamisch-volumetrischen Verfahren zur Herstellung von Kalibriergasgemischen behandelt. Der vorliegende Teil legt ein Verfahren zur kontinuierlichen Herstellung von Kalibriergasgemischen aus reinen Gasen oder Gasgemischen mithilfe von Kapillardosierern in einzelnen Systemen oder mehrstufigen Kombinationen (Gasteiler) fest.
Einzelne Kapillarsysteme können verwendet werden, um Gasgemische herzustellen, deren kleinere Komponente im Bereich von Volumenanteilen zwischen 10–8 bis 0,5 liegt.
Die relative erweiterte Unsicherheit dieses Verfahrens beträgt weniger als 2 % (k = 2) relativ. Diese Anwendung wird in industriellen Gasmischgeräten zur Herstellung spezieller Gasatmosphären verwendet.
Gasteiler können verwendet werden, um Gasgemische, die aus Gasen oder Gasgemischen hergestellt wurden, in geregelte Volumenanteile zu teilen. Diese Geräte sind in der Lage, Verdünnungen im Bereich von Volumenanteilen zwischen 0,000 5 und 0,9 der ursprünglichen Gaskonzentration mit einer relativen Wiederholbarkeit besser als 0,5 % zu erreichen.
Die Rückführbarkeit von mit einem Gasteiler hergestellten Gasgemischen wird durch Vergleichen eines Gemisches mit Gasgemischen, die auf nationale oder internationale Gasnormale bezogen sind, erreicht. Ein Beispiel dafür ist in Anhang A aufgeführt.
Analyse des gaz - Préparation des mélanges de gaz pour étalonnage à l'aide de méthodes volumétriques dynamiques - Partie 5: Dispositifs d'étalonnage par capillaires (ISO 6145-5:2009)
L'ISO 6145-5:2009 fait partie d'une série de Normes internationales qui traitent des diverses méthodes volumétriques dynamiques utilisées pour la préparation des mélanges de gaz d'étalonnage. La présente partie spécifie une méthode de production continue de mélanges de gaz d'étalonnage à partir de gaz purs ou de mélanges de gaz, utilisant des dispositifs capillaires en combinaisons simples ou multiples (séparateurs de gaz).
Les systèmes par capillaires simples peuvent être utilisés pour obtenir des mélanges de gaz dont la fraction volumique du constituant minoritaire se situe dans la plage allant de 10-8 à 0,5.
L'incertitude élargie relative de cette technique est inférieure à ± 2 % (k = 2). Cette application est utilisée dans les installations de mélanges de gaz industriels pour la production d'atmosphères gazeuses spécifiques.
Des séparateurs de gaz peuvent être utilisés pour diviser les mélanges de gaz préparés à partir de gaz ou de mélanges de gaz en proportions contrôlées en volume. Ces dispositifs sont capables de dilutions de l'ordre de 0,000 5 à 0,9 en fraction volumique de la concentration gazeuse initiale, avec une répétabilité relative meilleure que 0,5 %.
La traçabilité des mélanges de gaz obtenus à l'aide d'un séparateur de gaz est obtenue par comparaison d'un mélange avec des mélanges de gaz raccordés à des étalons de gaz nationaux ou internationaux. Un exemple est donné à l'Annexe A.
Analiza plinov - Priprava kalibracijskih plinskih zmesi z uporabo dinamičnih volumetričnih metod - 5. del: Kapilarne kalibracijske naprave (ISO 6145-5:2009)
Ta del ISO 6145 je eden izmed serij mednarodnih standardov, ki se ukvarjajo z različnimi dinamičnimi volumetričnimi tehnikami, uporabljenih za pripravo kalibracijskih plinskih zmesi. Ta del določa metodo za neprekinjeno proizvodnjo kalibracijskih plinskih zmesi iz čistih plinov ali plinskih zmesi z uporabo kapilarnih kalibracijskih naprav v enojnih ali več kombinacijah (ločevalniki plinov). Enojni kapilarni sistemi se lahko uporabljajo, da zagotovijo plinsko zmes, kjer je manjša sestavina v razponu volumskega deleža od 10–8 do 0,5. Negotovost relativnega širjenja te tehnike je manj kot ±2 % (k = 2) relativna. Ta aplikacija je uporabljena v industrijskih panelih za mešanje plinov za proizvodnjo nekaterih plinskih atmosfer. Ločevalniki plinov se lahko uporabljajo za ločevanje plinskih zmesi od plinov ali plinskih zmesi v nadzorovanem razmerju glede na volumen. Te naprave so zmožne redčenja v razponu volumskega deleža od 0,0005 do 0,9 prvotne vsebnosti plina z relativno ponovljivostjo, ki je boljša od 0,5 %. Sledljivost plinskih zmesi, ki jih proizvede ločevalnik plinov, je dosežena s primerjavo zmesi s plinsko zmesjo, ki se nanaša na državne ali mednarodne plinske standarde. Primer je podan v dodatku A.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 6145-5:2011
01-marec-2011
$QDOL]DSOLQRY3ULSUDYDNDOLEUDFLMVNLKSOLQVNLK]PHVL]XSRUDERGLQDPLþQLK
YROXPHWULþQLKPHWRGGHO .DSLODUQHNDOLEUDFLMVNHQDSUDYH ,62
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods
- Part 5: Capillary calibration devices (ISO 6145-5:2009)
Gasanalyse - Herstellung von Kalibriergasgemischen mit Hilfe von dynamisch-
volumetrischen Verfahren - Teil 5: Kapillardosierer (ISO 6145-5:2009)
Analyse des gaz - Préparation des mélanges de gaz pour étalonnage à l'aide de
méthodes volumétriques dynamiques - Partie 5: Dispositifs d'étalonnage par capillaires
(ISO 6145-5:2009)
Ta slovenski standard je istoveten z: EN ISO 6145-5:2010
ICS:
71.040.40 Kemijska analiza Chemical analysis
SIST EN ISO 6145-5:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 6145-5:2011
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SIST EN ISO 6145-5:2011
EUROPEAN STANDARD
EN ISO 6145-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 71.040.40
English Version
Gas analysis - Preparation of calibration gas mixtures using
dynamic volumetric methods - Part 5: Capillary calibration
devices (ISO 6145-5:2009)
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 5:
dynamiques - Partie 5: Dispositifs d'étalonnage par Kapillardosierer (ISO 6145-5:2009)
capillaires (ISO 6145-5:2009)
This European Standard was approved by CEN on 11 December 2010.
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-CENELEC 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-CENELEC Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6145-5:2010: E
worldwide for CEN national Members.
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SIST EN ISO 6145-5:2011
EN ISO 6145-5:2010 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 6145-5:2011
EN ISO 6145-5:2010 (E)
Foreword
The text of ISO 6145-5:2009 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 6145-5:2010.
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 June 2011, and conflicting national standards shall be withdrawn at
the latest by June 2011.
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, Croatia, 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 6145-5:2009 has been approved by CEN as a EN ISO 6145-5:2010 without any modification.
3
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SIST EN ISO 6145-5:2011
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SIST EN ISO 6145-5:2011
INTERNATIONAL ISO
STANDARD 6145-5
Second edition
2009-11-01
Gas analysis — Preparation of calibration
gas mixtures using dynamic volumetric
methods —
Part 5:
Capillary calibration devices
Analyse des gaz — Préparation des mélanges de gaz pour étalonnage
à l'aide de méthodes volumétriques dynamiques —
Partie 5: Dispositifs d'étalonnage par capillaires
Reference number
ISO 6145-5:2009(E)
©
ISO 2009
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SIST EN ISO 6145-5:2011
ISO 6145-5:2009(E)
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ii © ISO 2009 – All rights reserved
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SIST EN ISO 6145-5:2011
ISO 6145-5:2009(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Principle.1
4 Apparatus.2
4.1 Two-capillary blending system .2
4.1.1 Set-up.2
4.1.2 Apparatus.2
4.1.3 Procedure.3
4.2 Multiple capillary devices using gas dividers .4
4.2.1 Set-up of a gas divider.4
4.2.2 Gas dividers with a combination of non-identical capillaries.4
4.2.3 Gas dividers with a combination of identical capillaries .5
4.2.4 Operation of a gas divider with identical capillaries .6
4.2.5 Determination of the flow rates.6
5 Expression of results.7
5.1 Volume fraction .7
5.2 Sources of uncertainties.7
5.2.1 Temperature.7
5.2.2 Viscosity.7
5.2.3 Pressure .8
5.2.4 Geometry of the capillary tubes.8
5.3 Verification of the blending system/gas divider.8
5.4 Determination of uncertainties .8
Annex A (informative) Numerical example.10
Annex B (informative) Derivation of the formula for combined uncertainty in K .13
Bibliography.14
© ISO 2009 – All rights reserved iii
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SIST EN ISO 6145-5:2011
ISO 6145-5:2009(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 6145-5 was prepared by Technical Committee ISO/TC 158, Analysis of gases.
This second edition cancels and replaces the first edition (ISO 6145-5:2001), which has been technically
revised. Some subclauses (such as Procedure and Calculations) have been detached from other closely
related clauses and readability has been improved by bringing these subclauses closer together. The principle
and verification parts have been clarified and separated, the uncertainty section has been checked and
slightly updated and Annex A has been revised. An informative derivation of the relative combined standard
uncertainty calculation has been added as Annex B.
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
ISO 6145-3, entitled Periodic injections into a flowing gas stream, has been withdrawn.
iv © ISO 2009 – All rights reserved
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SIST EN ISO 6145-5:2011
INTERNATIONAL STANDARD ISO 6145-5:2009(E)
Gas analysis — Preparation of calibration gas mixtures using
dynamic volumetric methods —
Partie 5:
Capillary calibration devices
1 Scope
This part of ISO 6145 is one of a series of International Standards dealing with the various dynamic volumetric
techniques used for the preparation of calibration gas mixtures. This part specifies a method for the
continuous production of calibration gas mixtures from pure gases or gas mixtures using capillary calibration
devices in single or multiple combinations (gas dividers).
Single capillary systems can be used to provide gas mixtures where the minor component is in the range of
−8
volume fractions from 10 to 0,5.
The relative expanded uncertainty of this technique is less than ±2 % (k = 2) relative. This application is used
in industrial gas mixing panels for the production of specific gas atmospheres.
Gas dividers can be used to divide gas mixtures prepared from gases or gas mixtures into controlled
proportions by volume. These devices are capable of dilutions in the range of volume fractions from 0,000 5 to
0,9 of the primary gas concentration with a relative repeatability of better than 0,5 %.
Traceability of the gas mixtures produced by a gas divider is achieved by comparison of a mixture with gas
mixtures related to national or international gas standards. An example is given in Annex A.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 6143, Gas analysis — Comparison methods for determining and checking the composition of calibration
gas mixtures
ISO 6145-1, Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods —
Part 1: Methods of calibration
3 Principle
A constant flow of gas from a capillary tube under conditions of constant pressure drop is added to a
controlled flow of complementary gas. The complementary gas flow may also be derived from another
capillary tube.
The appropriate capillaries are selected to give the required flows of gases into the mixing manifold. If an
appropriate capillary is selected, the required flow is obtained by adjusting the pressure drop across the
capillary.
© ISO 2009 – All rights reserved 1
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SIST EN ISO 6145-5:2011
ISO 6145-5:2009(E)
Commercially available units consisting of several capillary tubes are called gas dividers. Such gas dividers
containing combinations of capillaries may be used to dilute pure gases or further dilute calibration gas
mixtures with complementary gas, thus generating further calibration standards.
4 Apparatus
4.1 Two-capillary blending system
4.1.1 Set-up
Figure 1 shows a possible set-up of a gas mixing system using two capillary tubes, i.e. a two-capillary system.
Key
1 two-stage pressure regulator
2 fine adjustment valve
3 pressure differential manometer
4 capillary
5 mixing manifold
a
Gas A.
b
Complementary gas.
c
Gas mixture.
Figure 1 — Two-capillary blending system
4.1.2 Apparatus
4.1.2.1 Capillaries, each supplied with gas from a cylinder fitted with a two-stage pressure regulator, gas
filter and a fine adjustment valve.
4.1.2.2 Two-stage pressure regulator, equipped with fine adjustment valves.
4.1.2.3 Differential manometer, capable of measuring the pressure drop across the capillary.
2 © ISO 2009 – All rights reserved
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SIST EN ISO 6145-5:2011
ISO 6145-5:2009(E)
4.1.2.4 Gas manifold, fed by the flow from each capillary where mixing occurs to produce the calibration
gas mixture at the outlet.
4.1.2.5 Gas filters, to filter the component gases, so as to prevent blockage of the capillaries.
4.1.2.6 Thermostatic controller (optional), to maintain the temperature of the capillaries constant.
Variations in temperature can cause a significant change in the viscosity of the component gas passing
through the capillary. For high accuracy, it is necessary to provide thermostatic control of the capillaries. With
thermostatic control of a water-jacket to ±1 °C, the volume fraction of the final mixture will not vary by more
than ±2 %.
4.1.3 Procedure
4.1.3.1 Operation
Open the gas supply cylinders and adjust the two-stage pressure regulators to approximately 200 kPa gauge
outlet pressure. Open the fine adjustment valves to give the pressure drop across the capillaries required for the
desired flows. The required pressure drop can be estimated using a modification of Equation (1), given in 4.1.3.2.
The accuracy of the mixture produced at any moment is principally affected by the constancy of the flow rates
of each component. These can be estimated by observations of the variation in the pressure differential
manometers applied across each capillary.
4.1.3.2 Determination of the capillary flow rate
The volume flow rate q of a gas A emerging from a capillary is approximately expressed as:
A
4
π− p p
r()
12
q = (1)
A
8ηL
where
r is the radius of the capillary tube;
p is the inlet pressure to the capillary;
1
p is the outlet pressure of the capillary;
2
η is the dynamic viscosity of the gas at the temperature of usage;
L is the length of the capillary tube.
For a given capillary, Equation (1) can be simplified by the use of an individual cali
...
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