BS-ISO-6145-8-2005.pdf
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1、BRITISH STANDARD BS ISO 6145-8:2005 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 8: Diffusion method ICS 71.040.40 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:45:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 6145-8:2005 This Britis
2、h Standard was published under the authority of the Standards Policy and Strategy Committee on 5 September 2005 BSI 5 September 2005 ISBN 0 580 46494 6 National foreword This British Standard reproduces verbatim ISO 6145-8:2005 and implements it as the UK national standard. The UK participation in i
3、ts preparation was entrusted to Technical Committee PTI/15, Natural gas and gas analysis, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publicati
4、ons referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessa
5、ry provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpr
6、etation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 19 and a
7、 back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:45:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 6145
8、-8:2005(E) INTERNATIONAL STANDARD ISO 6145-8 First edition 2005-02-01 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 8: Diffusion method Analyse des gaz Prparation de mlanges de gaz pour talonnage laide de mthodes volumtriques Partie 8: Mthode par diffusio
9、n BS ISO 6145-8:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:45:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:45:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 6145-8:2005 iii Contents Page Foreword iv Introduction
10、v 1 Scope 1 2 Normative references . 1 3 Principle . 1 4 Reagents and materials 2 5 Apparatus. 3 6 Procedure. 4 6.1 Preliminary checks and operating conditions . 4 6.2 Determination of mass loss . 5 7 Expression of results 6 7.1 Calculation . 6 7.2 Sources of uncertainty . 7 Annex A (informative) Pr
11、actical example of a diffusion cell calibrator configured for evaluating speed of response in a hygrometer 10 Annex B (informative) Example of performances of diffusion cells for toluene and trichloromethane. 13 Annex C (informative) Example of uncertainty calculations for a periodic weighing system
12、 15 Bibliography . 19 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:45:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 6145-8:2005 iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wor
13、k 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-governme
14、ntal, 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 m
15、ain 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. A
16、ttention 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 6145-8 was prepared by Technical Committee ISO/TC 158, Analysis of gases. ISO 6145 consists of the
17、 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:
18、 Thermal mass-flow controllers Part 8: Diffusion method Part 9: Saturation method Part 10: Permeation method Part 11: Electrochemical generation Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:45:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Introduction This part of ISO 6145 is one of a
19、 series of International Standards that present various dynamic volumetric methods used for the preparation of calibration gas mixtures. In the lower part of the mole fraction range considered, it is difficult to prepare and maintain gas mixtures for example of certain organic or reactive components
20、 in cylinders. This dynamic method has the advantage of a practically unlimited supply of calibration component, whereby adsorption effects can be reduced or even eliminated. If the complementary gas flow is measured as a gas mass flow, the preparation of calibration gas mixtures using diffusion is
21、a dynamic-gravimetric method which gives contents in mole fractions. Principles for the measurement of the complementary gas flow are given in ISO 6145-1. BS ISO 6145-8:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:45:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy
22、: sheffieldun sheffieldun, na, Mon Nov 27 05:45:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 8: Diffusion method 1 Scope This part of ISO 6145 specifies a dynamic method using diffusion for the preparation
23、of calibration gas mixtures containing component mole fractions ranging from 109 to 103. A relative expanded uncertainty of measurement, U, obtained by multiplying the relative combined standard uncertainty by a coverage factor k = 2, of not greater than 2 % can be achieved by using this method. By
24、keeping the path between the diffusion source and place of use as short as possible, the method can be applied for the generation of low-concentration calibration gases of organic components that are liquid at room temperature, with boiling points ranging from about 40 C to 160 C. This part of ISO 6
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