BS-4559-7-1981 ISO-6349-1979.pdf
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1、BRITISH STANDARD BS 4559-7: 1981 ISO 6349:1979 Methods for Preparation of calibration gas mixtures Part 7: Permeation method ISO title: Gas analysis Preparation of calibration gas mixtures Permeation method UDC 543.27:54 13 185:53.089.62 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:17:5
2、1 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4559-7:1981 This British Standard, having been prepared under the direction of the Environment and Pollution Standards Committee, was published under the authority of the Executive Board and comes into effect on 30 April 1981 BSI 11-1999 First publishe
3、d as BS 4559 March 1970 First part revision as Part 7 April 1981 The following BSI references relate to the work on this standard: Committee reference EPC/46 Draft for comment 78/53755 DC ISBN 0 580 11851 7 Cooperating organizations The Environment and Pollution Standards Committee, under whose dire
4、ction this British Standard was prepared, consists of representatives from the following: Association of County Councils British Gas Corporation* British Industrial Measuring and Control Apparatus Manufacturers Association* British Railways Board British Steel Industry Chemical Industries Associatio
5、n Chemical Society Committee for Environmental Conservation Confederation of British Industry Consumer Standards Advisory Committee of BSI Council of Engineering Institutions Department of Energy (Energy Technology) Department of Industry (Warren Spring Laboratory)* Department of the Environment (Wa
6、ter Engineering Division including Water Data Unit) Electricity Supply Industry in England and Wales* Engineering Equipment Users Association Greater London Council Health and Safety Executive Institute of Petroleum* Medical Research Council Ministry of Agriculture, Fisheries and Food National Coal
7、Board* National Consumers Council National Water Council Scottish Office Society of Chemical Industry* Trades Union Congress The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation o
8、f this British Standard: Cement Makers Federation Department of Energy (Gas Standards) Department of Industry Institution of Gas Engineers Scientific Instrument Manufacturers Association Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.Date of issueComme
9、nts Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:17:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4559-7:1981 BSI 11-1999i Contents Page Cooperating organizationsInside front cover National forewordii 1Scope and field of application1 2Principle1 3Example of applying the method1 4Accu
10、racy3 Bibliography6 Figure 1 Examples of permeation tubes4 Figure 2 Example of a permeation apparatus4 Figure 3 Further example of permeation apparatus5 Publication referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:17:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
11、 BS 4559-7:1981 ii BSI 11-1999 National foreword BS 4559 was first published in 1970 under the title “Methods for the preparation of gaseous mixtures”. The present revision is being issued in Parts to incorporate methods prepared by subcommittee 1, Preparation and definition of gas mixtures for cali
12、bration, of Technical Committee 158, Gas analysis, of the International Organization for Standardization (ISO) and to provide for revision where necessary of the methods included in the 1970 edition. This Part of this British Standard, which has been prepared under the direction of the Environment a
13、nd Pollution Standards Committee, is identical with ISO 6349:1979 “Gas analysis Preparation of calibration gas mixtures Permeation method”. A permeation method is described briefly in 4.3.5 of BS 4559:1970 and is superseded by this Part in greater detail. Terminology and conventions. The text of the
14、 International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a deci
15、mal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. Additional information. With reference to the footnote to 3.3.
16、4.2, guidance on sampling may be obtained from BS 5309 “Methods for sampling chemical products” Part 2:1976 “Sampling of gases” pending the publication of the International Standard, at present in course of preparation. A British Standard does not purport to include all the necessary provisions of a
17、 contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside ba
18、ck cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:17:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
19、 BS 4559-7:1981 BSI 11-19991 1 Scope and field of application This International Standard describes the principles of the permeation method, which is a continuous dynamic method, for the preparation of calibration gas mixtures in which the components that it is desired to use generally have a concen
20、tration between 109 and 105 (by volume), with an achievable accuracy of 2 % of the concentration of the component. (In practice, concentrations may also be expressed in micrograms per cubic metre). In the concentration range considered, it is difficult to maintain the gas mixtures in a stable state;
21、 it is therefore necessary to prepare the calibration gas just prior to its use, and to transfer it by the shortest path possible to the place where it is to be used. 2 Principle The principle of the method relies on the permeation of the component which is to be used (SO2, NO2, NH3, etc.) through a
22、n appropriate membrane into a flow of carrier gas which constitutes the complementary gas of the mixture obtained. The constituent, in a pure state, is contained in a tube1) (see clause 3), which is totally or partially swept at a known and controlled flow rate by the complementary gas, which is com
23、pletely clean, purified and, in particular, free from any trace of the component, and thus becomes charged with molecules having diffused. The complementary gas shall be chosen so as to avoid any interaction with the materials constituting the permeation tube. The diffusion rate of the substance thr
24、ough the membrane depends upon the substance itself, the nature, constitution and area of the membrane, and the temperature and differences between the partial pressure of the gas inside and outside the tube. These factors can be kept constant by proper operation of the tube. In the present state of
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