ISO-6145-7-2009.pdf
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1、 Reference number ISO 6145-7:2009(E) ISO 2009 INTERNATIONAL STANDARD ISO 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 Prparation des mlanges de gaz pour talonnage laide de
2、mthodes volumtriques dynamiques Partie 7: Rgulateurs thermiques de dbit massique Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 22:51:46 MDTNo reproduction or networking permitted without li
3、cense from IHS -,-,- ISO 6145-7:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing
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6、ariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writin
7、g 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 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reserved Copyright I
8、nternational Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 22:51:46 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 6145-7:2009(E) ISO 2009 All rights reserved iii Contents Page Forew
9、ord 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
10、 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) Pr
11、actical hints. 10 Annex C (informative) Calculation of uncertainties 12 Bibliography. 15 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 04/07/2009 22:51:46 MDTNo reproduction or networking permitted wi
12、thout license from IHS -,-,- ISO 6145-7:2009(E) iv ISO 2009 All rights reserved 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
13、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
14、 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.
15、 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
16、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
17、 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
18、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
19、 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 cla
20、uses 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 c
21、alibration 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: Saturat
22、ion method Part 10: Permeation method Part 11: Electrochemical generation ISO 6145-3, entitled Periodic injections into a flowing gas stream, has been withdrawn. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for
23、Resale, 04/07/2009 22:51:46 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 6145-7:2009(E) ISO 2009 All rights reserved 1 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 7: Thermal mass-flow controllers 1
24、 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 ga
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