1、December 2015 English price group 19No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 71.040.40!%Jq“2399678www.din.de
2、DIN EN ISO 6142-1Gas analysis Preparation of calibration gas mixtures Part 1: Gravimetric method for Class I mixtures (ISO 6142-1:2015);English version EN ISO 6142-1:2015,English translation of DIN EN ISO 6142-1:2015-12Gasanalyse Herstellung von Kalibriergasen Teil 1: Wgeverfahren fr Gemische der Kl
3、asse I (ISO 6142-1:2015);Englische Fassung EN ISO 6142-1:2015,Englische bersetzung von DIN EN ISO 6142-1:2015-12Analyse des gaz Prparation des mlanges de gaz pour talonnage Partie 1: Mthode gravimtrique des mlanges Classe I (ISO 6142-1:2015);Version anglaise EN ISO 6142-1:2015,Traduction anglaise de
4、 DIN EN ISO 6142-1:2015-12SupersedesDIN EN ISO 6142:2006-11www.beuth.deDocument comprises 49 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.12.15DIN EN ISO 6142-1:2015-12 2 A comma is used as the decimal marker. National forew
5、ord This document (EN ISO 6142-1:2015) has been prepared by Technical Committee CEN/TC 158 “Analysis of gases” (Secretariat: NEN, Netherlands) in collaboration with CEN/CS. The responsible German body involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materia
6、ls Testing), Working Committee NA 062-05-73 AA Gasanalyse und Gasbeschaffenheit. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 6141 DIN EN ISO 6141 ISO 6143 DIN EN ISO 6143 ISO 14912 DIN EN ISO 14912 ISO 16664 DIN EN ISO 16664 Amendme
7、nts This standard differs from DIN EN ISO 6142:2006-11 as follows: a) the title of the standard has been changed to include “for Class I mixtures”; b) an Introduction has been included; c) Clauses 3 “Terms and definitions” and 4 “Symbols” have been added; d) Clause 7 “Purity analysis” has been added
8、; e) Clause 8 “Determination of masses and calculation of preparation uncertainty” has been added; f) Clause 9 “Homogeneity and stability of the calibration gas mixture” has been added; g) Clause 10 “Verification of calibration gas mixture composition” (previously Clause 6) has been revised; h) Clau
9、se 11 “Uncertainty of the calibration gas mixture and preparation of certificate” has been added; i) the Annexes have been completely restructured and revised, e.g. the previous Annex C “Precautions to be taken when weighing, handling and filling cylinders” is now Annex A; j) the estimation of the u
10、ncertainty has been brought in line with the state of the art; k) the validation of the composition of gravimetrically prepared calibration gases has been brought in line with the state of the art. Previous editions DIN ISO 6142: 1985-05 DIN EN ISO 6142: 2006-11 DIN EN ISO 6142-1:2015-12 3 National
11、Annex NA (informative) Bibliography DIN EN ISO 6141, Gas analysis Contents of certificates for calibration gas mixtures DIN EN ISO 6143, Gas analysis Comparison methods for determining and checking the composition of calibration gas mixtures DIN EN ISO 14912, Gas analysis Conversion of gas mixture c
12、omposition data DIN EN ISO 16664, Gas analysis Handling of calibration gases and gas mixtures Guidelines DIN EN ISO 6142-1:2015-12 4 Page intentionally left blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6142-1 September 2015 ICS 71.040.40 Supersedes EN ISO 6142:2006English Version G
13、as analysis - Preparation of calibration gas mixtures - Part 1: Gravimetric method for Class I mixtures (ISO 6142-1:2015) Analyse des gaz - Prparation des mlanges de gaz pour talonnage - Partie 1 : Mthode gravimtrique des mlanges Classe I (ISO 6142-1:2015) Gasanalyse - Herstellung von Kalibriergasen
14、 - Teil 1: Wgeverfahren fr Gemische der Klasse I (ISO 6142-1:2015) This European Standard was approved by CEN on 5 September 2015. 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 stand
15、ard 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 an
16、y 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 Repu
17、blic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN
18、 COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6142-1:2015 ECon
19、tents Page European foreword . 4 Foreword 5Introduction 61 Scope . 72 Normative references 73 Terms and definitions . 74 Symbols 85 Principle 96 Planning the preparation of the mixture . 116.1 Feasibility of preparing the gas mixture 116.1.1 Safety considerations 116.1.2 Reactions of mixture compone
20、nts . 116.1.3 Reactions with container materials 116.2 Choice of preparation method 116.3 Calculation of target masses . 126.4 Condensation of components from the gas phase . 127 Purity analysis 128 Determination of masses and calculation of preparation uncertainty 138.1 Preparation of cylinder . 13
21、8.2 Determination of masses and their uncertainties . 138.3 Atomic weights and molar masses . 138.4 Calculation of the mixture composition . 148.5 Calculation of gravimetric uncertainty . 149 Homogeneity and stability of the calibration gas mixture 149.1 Homogeneity 149.2 Stability . 159.2.1 General
22、. 159.2.2 Assessing stability . 159.2.3 Statistics for assessment stability .179.2.4 Calculation of the preparation uncertainty 1710 Verification of calibration gas mixture composition 1710.1 Objectives 1710.2 Statistical tests for consistency and uncertainty due to verification 1811 Uncertainty of
23、the calibration gas mixture and preparation of certificate 18Annex A (informative) Precautions to be taken when weighing, handling and filling cylinders 20Annex B (informative) Practical examples 25Annex C (informative) Guidelines for estimating filling pressures so as to avoid condensation of conde
24、nsable components in gas mixtures .28Annex D (normative) Liquid introduction .31Annex E (informative) Atomic weights and molar masses .38Annex F (informative) Derivation of the equation for calculating the calibration gas mixture composition .402 EN ISO 6142-1:2015 (E) DIN EN ISO 6142-1:2015-12Bibli
25、ography .44Annex G (informative) Sensitivity coefficients for the calculation of the uncertainty of the amount fraction of a component .42Annex H (informative) Derivation of the equation for the final measurement uncertainty on the calibration gas mixture 433EN ISO 6142-1:2015 (E)DIN EN ISO 6142-1:2
26、015-12European foreword This document (EN ISO 6142-1:2015) has been prepared by Technical Committee ISO/TC 158 “Analysis of gases“. 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 March 2016, and
27、conflicting national standards shall be withdrawn at the latest by March 2016. 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. This do
28、cument supersedes EN ISO 6142:2006. 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, Former Yugosla
29、v Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 6142-1:2015 has
30、been approved by CEN as EN ISO 6142-1:2015 without any modification. 4 EN ISO 6142-1:2015 (E) DIN EN ISO 6142-1:2015-12ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Stan
31、dards 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 t
32、ake part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In p
33、articular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements o
34、f this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see
35、 www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to
36、 the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 158, Analysis of gases.This first edition of ISO 6142-1 cancels and replaces ISO 6142:2001, which has been technically revised
37、 to update the methods of preparation, estimation of the uncertainty, and validation of the composition of gravimetrically prepared calibration gases. It also incorporates the Amendment ISO 6142:2001/Amd.1:2009.ISO 6142 consists of the following parts, under the general title Gas analysis Preparatio
38、n of calibration gas mixtures: Part 1: Gravimetric method for Class I mixturesA future part dealing with gravimetric method for Class II mixtures.5EN ISO 6142-1:2015 (E)DIN EN ISO 6142-1:2015-12IntroductionThe revision of ISO 6142 was initiated to provide better guidance to the users of this Interna
39、tional Standard especially with respect to quality assurance measures and laboratory accreditation. In preparing the revision, it was decided to make accommodation for two types of calibration gas mixtures with different levels of quality assurance and with different levels of measurement uncertaint
40、y. The difference in the two classes can be summarized as follows:Class I type calibration gas mixtures are prepared in accordance with this part of ISO 6142. The mixtures are individually verified. Provided rigorous and comprehensive quality assurance and quality control procedures are adopted duri
41、ng the preparation and verification of these mixtures, uncertainties may be achieved that are substantially smaller than by any other preparation method.Class II type calibration gas mixtures are prepared in a similar manner to Class I calibration gas mixtures but these mixtures are not individually
42、 verified. Verification of Class II calibration gas mixtures can be based on random verification checks. These checks are monitored by means of statistical quality control to be described in a future part. For mixtures containing identical compounds and nominally identical amountofsubstance fraction
43、s, Class II type calibration gas mixtures will always have amountofsubstance fractions with larger uncertainties than their Class I counterparts.6 EN ISO 6142-1:2015 (E) DIN EN ISO 6142-1:2015-121 ScopeThis part of ISO 6142 specifies a gravimetric method for the preparation of calibration gas mixtur
44、es in cylinders with traceable values for the amount-of-substance fraction (amount fraction) of one or more components. This part of ISO 6142 describes a method for calculating the uncertainty associated with the amount fraction of each component. This uncertainty calculation requires the evaluation
45、 of the contributions to the uncertainty due to factors including the weighing process, the purity of the components, the stability of the mixture, and the verification of the final mixture.This part of ISO 6142 is only applicable to mixtures of gaseous or totally vaporized components, which may be
46、introduced into the cylinder in the gaseous or liquid state. Both binary and multi-component gas mixtures (including natural-gas type mixtures) are covered by this part of ISO 6142. Methods for the batch production of more than one mixture in a single process are not included in this part of ISO 614
47、2.This part of ISO 6142 requires estimation of the stability of the mixture for its intended life time (maximum storage life), but it is not for use with components that react with each other unintentionally. This part of ISO 6142 also requires the impurities in each parent gas or liquid used in the
48、 preparation of the mixture to be assessed and quantified.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the lates
49、t edition of the referenced document (including any amendments) applies.ISO 6141, Gas analysis Contents of certificates for calibration gas mixturesISO 6143, Gas analysis Comparison methods for determining and checking the composition of calibration gas mixturesISO 7504, Gas analysis VocabularyISO 14912, Gas analysis Conversion of gas mixture composition dataISO 16664, Gas analysis Handling of calibration gases and gas mixtures GuidelinesISO 19229, Gas analysis Purity analysis and the treatment of purity dataISO/TS 29041
