EN ISO 6145-6-2008 en Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 6 Critical orifices《气体分析 动态容量法制备校准气体混合物 第6部分 临界孔》.pdf
《EN ISO 6145-6-2008 en Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 6 Critical orifices《气体分析 动态容量法制备校准气体混合物 第6部分 临界孔》.pdf》由会员分享,可在线阅读,更多相关《EN ISO 6145-6-2008 en Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 6 Critical orifices《气体分析 动态容量法制备校准气体混合物 第6部分 临界孔》.pdf(20页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 6: Critical orifices ICS 71.040.40 6145-6:2008 BS EN ISOThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 16 May 2003 BS EN ISO 6145-6:2
2、008 ISBN 978 0 580 60360 0 National foreword This British Standard is the UK implementation of EN ISO 6145-6:2008. It is identical with ISO 6145-6:2003. It supersedes BS ISO 6145-6:2003 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PTI/15, Natural g
3、as and gas analysis. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard canno
4、t confer immunity from legal obligations. Date Comments This corrigendum renumbers BS ISO 6145-6:2003 as BS EN ISO 6145-6:2008 28 February 2009 BSI 2009 Amendments/corrigenda issued since publicationEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6145-6 August 2008 ICS 71.040.40 English Ver
5、sion Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 6: Critical orifices (ISO 6145- 6:2003) Analyse des gaz - Prparation des mlanges de gaz pour talonnage laide de mthodes volumtriques dynamiques - Partie 6: Orifices critiques (ISO 6145-6:2003) Gasanal
6、yse - Herstellung von Kalibriergasgemischen mit Hilfe von dynamisch-volumetrischen Verfahren - Teil 6: Kritische Dsen (ISO 6145-6:2003) 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
7、 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 off
8、icial 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 Austri
9、a, 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 COMMIT
10、TEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6145-6:2008: EForeword The text o
11、f ISO 6145-6:2003 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 6145-6:2008 by Technical Committee CEN/SS N21 “Gaseous fuels and combustible gas” the secretariat of which is held b
12、y 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 th
13、at 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 t
14、o 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, Switz
15、erland and the United Kingdom. Endorsement notice The text of ISO 6145-6:2003 has been approved by CEN as a EN ISO 6145-6:2008 without any modification. BSENISO61456:2008OSI -54163002:6)E( ISO 3002 r llAithgs reservde iii Contents Page 1 Scope 1 2 Normative references 1 3 Principle 1 4 Application t
16、o preparation of gas mixtures 2 4.1 Description of the orifice system and the experimental procedure . 2 4.2 Area of validity . 4 4.3 Operating conditions 4 5 Calculation of operating parameters and results . 4 5.1 Selection of suitable orifice systems 4 5.2 Calculation of volume fraction . 5 5.3 So
17、urces of uncertainty . 5 5.4 Uncertainty of volume fraction 6 Annex A (informative) Premixed gases for preparation of mixtures of high dilution 7 Annex B (informative) Practical hints . 9 Bibliography . 11 iii BSENISO61456:2008blankOSI -54163002:6)E( ISO 3002 r llAithgs reservde v Introduction This
18、part of ISO 6145 is one of a series of standards that present various dynamic volumetric methods used for the preparation of calibration gas mixtures. v BSENISO61456:2008ANRETNIITOTS LANDNADRA OSI -54163002:6)E( ISO 3002 r llAithgs reservde 1 Gas analysis Preparation of calibration gas mixtures usin
19、g dynamic volumetric methods Part 6: Critical orifices 1S c o p e This part of ISO 6145 specifies a method for the continuous production of calibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by use of critical orifice systems. By selection of appropria
20、te combinations of orifices and with the use of pure gases, the volume fraction of the calibration component in the calibration gas mixture can be varied by a factor of . Additionally, it can be changed by a factor of by changing the initial pressures in the orifice systems. The uncertainty of the m
21、ethod depends mainly upon the flow calibration method and the variations in temperature and outlet pressure. The relative expanded uncertainty in the volume fraction obtainable for a binary mixture (at a coverage factor of 2) is . If pre-mixed gases are used instead of pure gases, much lower volume
22、fractions can be obtained (see Annex A). The mass flow rates or volume flow rates, from which the mass or volume fractions are determined, can be calculated and can be independently measured by a suitable method given in ISO 6145-1. The merits of the method are that multi-component mixtures can be p
23、repared as readily as binary mixtures if the appropriate number of orifices is utilized, and that a large quantity of calibration gas mixture can be prepared on a continuous basis. The range of flow rates can be from several millilitres per minute to approximately . Although particularly applicable
24、to preparation of gas mixtures at barometric pressure, the method also provides a means of preparation of calibration gas mixtures at pressures above barometric pressure. Annex B gives practical hints on the use of the method. 2 Normative references The following referenced documents are indispensab
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