EN ISO 6145-7:2010
(Main)Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 7: Thermal mass-flow controllers (ISO 6145-7:2009)
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 7: Thermal mass-flow controllers (ISO 6145-7:2009)
ISO 6145-7:2009 specifies a method for continuous production of calibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by use of commercially available thermal mass-flow controllers.
If this method is employed for the preparation of calibration gas mixtures, the optimum performance is as follows: the relative expanded uncertainty of measurement, U, obtained by multiplying the combined standard uncertainty by a coverage factor k = 2, is not greater than 2 %.
If pre-mixed gases are used instead of pure gases, mole fractions below 10-6 can be obtained. The measurement of mass flow is not absolute and the flow controller requires independent calibration.
The merits of the method are that a large quantity of the gas mixture can be prepared on a continuous basis and that multicomponent mixtures can be prepared as readily as binary mixtures if the appropriate number of thermal mass-flow controllers is utilized.
Gasanalyse - Herstellung von Kalibriergasgemischen mit Hilfe von dynamisch-volumetrischen Verfahren - Teil 7: Thermische Massendurchflussregler (ISO 6145-7:2009)
Dieser Teil von ISO 6145 ist Teil einer Reihe Internationaler Normen, die die verschiedenen dynamischvolumetrischen
Verfahren zur Herstellung von Kalibriergasgemischen behandelt. Der vorliegende Teil legt ein
Verfahren zur kontinuierlichen Herstellung von Kalibriergasgemischen mit zwei oder mehr Komponenten aus
reinen Gasen oder anderen Gasgemischen mithilfe handelsüblicher thermischer Massendurchflussregler fest.
Wird dieses Verfahren zur Herstellung von Kalibriergasgemischen angewendet, ist die optimale Leistung wie
folgt: die relative erweiterte Messunsicherheit U, die durch Multiplizieren der kombinierten Standardunsicherheit
mit einem Überdeckungsfaktor von k = 2 erhalten wird, ist nicht größer als 2 %.
Werden anstelle reiner Gase Gasvorgemische verwendet, können Molfraktionen unter 10–6 erreicht werden.
Die Messung des Massenstroms ist nicht absolut und für den Massendurchflussregler ist eine unabhängige
Kalibrierung erforderlich.
Die Vorzüge dieses Verfahrens bestehen darin, dass eine große Menge des Gasgemischs auf einer
kontinuierlichen Grundlage hergestellt werden kann und dass Mehrkomponentengemische genauso leicht
herzustellen sind wie binäre Gemische, sofern die entsprechende Anzahl thermischer Massendurchflussregler
eingesetzt wird.
ANMERKUNG Gasmischsysteme auf der Grundlage thermischer Massendurchflussregler, die zum Teil die Möglichkeit
einer Computersteuerung oder automatischen Steuerung einschließen, sind im Handel erhältlich.
Analyse des gaz - Préparation des mélanges de gaz pour étalonnage à l'aide de méthodes volumétriques dynamiques - Partie 7: Régulateurs thermiques de débit massique (ISO 6145-7:2009)
L'ISO 6145‑7:2009 spécifie une méthode de production continue de mélanges de gaz pour étalonnage à au moins deux constituants, à partir de gaz purs ou d'autres mélanges de gaz, en utilisant les régulateurs thermiques de débit massique disponibles sur le marché.
Si cette méthode est employée pour la préparation de mélanges de gaz pour étalonnage, la performance optimale est la suivante: l'incertitude élargie relative de mesurage, U, obtenue en multipliant l'incertitude type composée par un facteur d'élargissement k = 2, n'est pas supérieure à 2 %.
Si l'on utilise des gaz mélangés au préalable à la place des gaz purs, il est possible d'obtenir des fractions molaires inférieures à 10-6. Le mesurage du débit massique n'étant alors pas suffisamment précis, le régulateur de débit doit faire l'objet d'un étalonnage indépendant.
Cette méthode a pour principal mérite de permettre la préparation en continu d'un mélange de gaz en grande quantité ainsi que de rendre la préparation de mélanges à plusieurs constituants aussi simple que celle de mélanges ne comptant que deux constituants, à condition d'utiliser le bon nombre de régulateurs thermiques de débit massique.
Analiza plinov - Priprava kalibracijskih plinskih zmesi z uporabo dinamičnih volumetričnih metod - 7. del: Termični regulatorji masnega pretoka (ISO 6145-7:2009)
Ta del ISO 6145 je eden izmed serij mednarodnih standardov, ki se ukvarjajo z dinamičnimi volumetričnimi tehnikami, uporabljenimi za pripravo kalibracijskih plinskih zmesi. Ta del določa metodo za neprekinjeno proizvodnjo kalibracijskih plinskih zmesi, ki vsebujejo dve ali več sestavin, iz čistih plinov ali drugih plinskih zmesi z uporabo komercialno dostopnih termičnih regulatorjev masnega pretoka. Če je ta metoda uporabljena za pripravo kalibracijskih plinskih zmesi, je optimalno delovanje naslednje: negotovost relativnega širjenja meritve U, pridobljene z množenjem združene standardne negotovosti s faktorjem pokritja k = 2, ki ni večji kot 2 %. Če so uporabljeni vnaprej zmešani plini namesto čistih plinov, lahko dosežemo molske frakcije pod 10–6. Meritev pretoka mase ni absolutna in regulator masnega pretoka potrebuje neodvisno kalibracijo. Odlike te metode so, da je lahko večja količina plinske zmesi pripravljena neprekinjeno in da so lahko večkomponentne zmesi pripravljene enako hitro kot binarne zmesi, če je uporabljeno primerno število termičnih regulatorjev masnega pretoka.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2011
$QDOL]DSOLQRY3ULSUDYDNDOLEUDFLMVNLKSOLQVNLK]PHVL]XSRUDERGLQDPLþQLK
YROXPHWULþQLKPHWRGGHO 7HUPLþQLUHJXODWRUMLPDVQHJDSUHWRND ,62
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods
- Part 7: Thermal mass-flow controllers (ISO 6145-7:2009)
Gasanalyse - Herstellung von Kalibriergasgemischen mit Hilfe von dynamisch-
volumetrischen Verfahren - Teil 7: Thermische Massendurchflussregler (ISO 6145-
7:2009)
Analyse des gaz - Préparation des mélanges de gaz pour étalonnage à l'aide de
méthodes volumétriques dynamiques - Partie 7: Régulateurs thermiques de débit
massique (ISO 6145-7:2009)
Ta slovenski standard je istoveten z: EN ISO 6145-7:2010
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 6145-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 71.040.40
English Version
Gas analysis - Preparation of calibration gas mixtures using
dynamic volumetric methods - Part 7: Thermal mass-flow
controllers (ISO 6145-7:2009)
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 7:
dynamiques - Partie 7: Régulateurs thermiques de débit Thermische Massendurchflussregler (ISO 6145-7:2009)
massique (ISO 6145-7:2009)
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 6145-7:2010: E
worldwide for CEN national Members.
Contents Page
Foreword .3
Foreword
The text of ISO 6145-7:2009 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 6145-7:2010.
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 6145-7:2009 has been approved by CEN as a EN ISO 6145-7:2010 without any modification.
INTERNATIONAL ISO
STANDARD 6145-7
Second edition
2009-04-01
Gas analysis — Preparation of calibration
gas mixtures using dynamic volumetric
methods —
Part 7:
Thermal mass-flow controllers
Analyse des gaz — Préparation des mélanges de gaz pour étalonnage
à l'aide de méthodes volumétriques dynamiques —
Partie 7: Régulateurs thermiques de débit massique
Reference number
ISO 6145-7:2009(E)
©
ISO 2009
ISO 6145-7:2009(E)
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ii © ISO 2009 – All rights reserved
ISO 6145-7:2009(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle. 2
5 Set-up. 2
5.1 General. 2
5.2 Thermal mass-flow controller using a constant current supply. 2
5.3 Thermal mass-flow controller under constant temperature control . 3
6 Preparation of gas mixtures . 4
6.1 Description of the experimental procedure .4
6.2 Area of validity . 6
6.3 Operating conditions. 6
7 Calculations. 7
7.1 Volume fraction. 7
7.2 Sources of uncertainty. 7
7.3 Uncertainty of measurement . 8
Annex A (informative) Pre-mixed gases for preparation of mixtures of high dilution . 9
Annex B (informative) Practical hints. 10
Annex C (informative) Calculation of uncertainties. 12
Bibliography . 15
ISO 6145-7:2009(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 6145-7 was prepared by Technical Committee ISO/TC 158, Analysis of gases.
This second edition cancels and replaces the first edition (ISO 6145-7:2001). In preparation of the first edition,
it was assumed that each thermal mass-flow controller (TMC) would be configured for use at its optimum
performance, and the uncertainty in the method was estimated on that basis. In this edition, therefore, extra
precautionary text has been added to make it clear that the method shall not be employed, for example, to
make a 10:1 binary mixture by using two thermal mass-flow controllers of identical range with one operated at
its maximum, say, of 1 000 ml/min and the other at 100 ml/min. In the first edition, this necessary provision
was only stated briefly in an informative annex; it has now been expanded and stated more explicitly in a
normative part. Another major update is separation of the original Clause 3 into two clauses, one of which
(Clause 4) defines the principle while the other (Clause 5) presents additional explanation to the user. The
latter of these clauses now includes the necessary requirements. By introducing two new and relevant
bibliographic references, the understanding of Annex B has been improved. Finally, some typing errors have
been corrected.
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
INTERNATIONAL STANDARD ISO 6145-7:2009(E)
Gas analysis — Preparation of calibration gas mixtures using
dynamic volumetric methods —
Part 7:
Thermal mass-flow controllers
1 Scope
This part of ISO 6145 is one of a series of International Standards dealing with dynamic volumetric methods
used for the preparation of calibration gas mixtures. This part specifies a method for continuous production of
calibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by use of
commercially available thermal mass-flow controllers.
If this method is employed for the preparation of calibration gas mixtures, the optimum performance is as
follows: the relative expanded uncertainty of measurement, U, obtained by multiplying the combined standard
uncertainty by a coverage factor k = 2, is not greater than 2 %.
−6
If pre-mixed gases are used instead of pure gases, mole fractions below 10 can be obtained. The
measurement of mass flow is not absolute and the flow controller requires independent calibration.
The merits of the method are that a large quantity of the gas mixture can be prepared on a continuous basis
and that multicomponent mixtures can be prepared as readily as binary mixtures if the appropriate number of
ther
...
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