ISO 6145-2-2014 Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 2 Piston pumps《气体分析 采用动态法制备校准混合气体 第2部分 活塞泵》.pdf
《ISO 6145-2-2014 Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 2 Piston pumps《气体分析 采用动态法制备校准混合气体 第2部分 活塞泵》.pdf》由会员分享,可在线阅读,更多相关《ISO 6145-2-2014 Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 2 Piston pumps《气体分析 采用动态法制备校准混合气体 第2部分 活塞泵》.pdf(36页珍藏版)》请在麦多课文档分享上搜索。
1、 ISO 2014 Gas analysis Preparation of calibration gas mixtures using dynamic methods Part 2: Piston pumps Analyse des gaz Prparation des mlanges de gaz pour talonnage laide de mthodes volumtriques dynamiques Partie 2: Pompes piston INTERNATIONAL STANDARD ISO 6145-2 Second edition 2014-08-15 Referenc
2、e number ISO 6145-2:2014(E) ISO 6145-2:2014(E)ii ISO 2014 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including ph
3、otocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749
4、 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ISO 6145-2:2014(E) ISO 2014 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 2 4 Symbols 2 5 Principle and equipment . 3 5.1 Principle 3 5.2 Equipment . 3 6 Calibr
5、ation gas mixture preparation . 5 6.1 Safety issues 5 6.2 Mixture feasibility 6 6.3 Preparation system and setting-up of mixture composition 7 6.4 Input pressure control 7 6.5 Temperature control 7 6.6 Homogenization . 7 6.7 Stability 8 6.8 Output pressure and flow pulsation . 8 6.9 Composition of t
6、he parent gases . 8 7 Calculation of volume fractions and associated uncertainty evaluation .9 7.1 Calculation method A 9 7.2 Calculation method B .10 8 Gas mixtur e c omposition v erification .12 Annex A (normative) Amount-of-substance fractions 13 Annex B (informative) Uncertainty evaluation of th
7、e gas mixture composition .15 Annex C (informative) Gas mixtur e v erification 21 Annex D (informative) Numerical example 25 Bibliography .30 ISO 6145-2:2014(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies
8、). 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 no
9、n-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. The procedures used to develop this document and those intended for its further maintenance are descr
10、ibed in the ISO/IEC Directives, Part 1. In particular 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. www.iso.org/directives Attention is drawn to the
11、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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO li
12、st of patent declarations received. 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
13、information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 158, Analysis of gases. This second edition cancels and replaces the first edition (ISO 61
14、45-2:2001), which has been technically revised. The main objective of this revision is to extend the first edition for calculating the composition in volume and amountofsubstance fractions from the displacement volumes of piston pumps. Appropriate measurement functions and guidance on uncertainty ev
15、aluation are given for the mixing of real gases at unequal operational conditions of the piston pumps. ISO 6145 consists of the following parts, under the general title Gas analysis Preparation of calibration gas mixtures using dynamic methods: Part 1: Methods of calibration Part 2: Volumetric pumps
16、 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 injection
17、s into a flowing gas stream, has been withdrawn.iv ISO 2014 All rights reserved INTERNATIONAL ST ANDARD ISO 6145-2:2014(E) Gas analysis Preparation of calibration gas mixtures using dynamic methods Part 2: Piston pumps 1 Scope ISO 6145 comprises a series of International Standards dealing with vario
18、us dynamic methods used for the preparation of calibration gas mixtures. This part of ISO 6145 describes a method and preparation system using piston pumps. The mixture composition and its associated uncertainty are based on calibration of the piston pumps by dimensional measurements. The calibratio
19、n gas mixtures prepared using this method consist of two or more components, prepared from pure gases or other gas mixtures using gas-mixing pumps. Such gas-mixing pumps contain at least two piston pumps, each driven with a defined ratio of strokes, and appropriate accessories for gas feeding and mi
20、xture homogenization. This part of ISO 6145 is applicable only to mixtures of gaseous or totally vaporized components including corrosive gases, as long as these components neither react with each other nor with the wetted surfaces of the mixing pump. The use of gas mixtures as parent gases is cover
21、ed as well. Multi-component gas mixtures and multi-step dilution procedures are included in this International Standard as they are considered to be special cases of the preparation of two-component mixtures. This part of ISO 6145 describes a method of preparing calibration gas mixtures whose compos
22、ition is expressed in volume fractions. The necessary equations and associated uncertainty evaluation to express the gas composition in amountofsubstance fractions are given in Annex A. With this method, provided that sufficient quality assurance and control measures are taken, calibration gas mixtu
23、res can be prepared with a relative expanded uncertainty of 0,5 % (coverage factor k = 2) in the volume fraction. Numerical examples showing that under specified conditions smaller uncertainties are attainable are given in Annexes B through D. Using this method, dilution ratios of 1:10 000 can be ac
24、hieved in discrete increments. Lower fractions (down to 1 10 8 ) can be achieved by multi-stage dilution or by the use of gas mixtures as input gases. Final mixture flow rates of 5 l/h to 500 l/h can be realized depending on the equipment used. 2 Normative references The following documents, in whol
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ISO614522014GASANALYSISPREPARATIONOFCALIBRATIONGASMIXTURESUSINGDYNAMICMETHODSPART2PISTONPUMPS 气体 分析 采用

链接地址:http://www.mydoc123.com/p-1254576.html