BS-ISO-6145-6-2003.pdf
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1、BRITISH STANDARD BS ISO 6145-6:2003 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 6: Critical orifices ICS 71.040.40 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:22:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 6145-6:2003 This Briti
2、sh Standard was published under the authority of the Standards Policy and Strategy Committee on 16 May 2003 BSI 16 May 2003 ISBN 0 580 41886 3 National foreword This British Standard reproduces verbatim ISO 6145-6:2003 and implements it as the UK national standard. It supersedes BS 4559-5.6:1987 whi
3、ch is withdrawn. The UK participation in its 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 Standar
4、ds which implement international or European publications 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 p
5、ublication does not purport to include all the necessary 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 interna
6、tional/European committee any enquiries on the interpretation, or proposals for change, and keep the 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 ti
7、tle page, pages ii to v, a blank page, pages 1 to 11 and a 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 04:22:00 GMT+00:00
8、2006, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARD ISO 6145-6 Second edition 2003-05-15 Reference number ISO 6145-6:2003(E) Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 6: Critical orifices Analyse des gaz Prparation des mlanges de gaz pour talonnag
9、e laide de mthodes volumtriques dynamiques Partie 6: Orifices critiques BS ISO 61456:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:22:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 61456:2003 ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:22:00 GMT+00:00 2006, Un
10、controlled Copy, (c) BSI OSI -54163002:6)E( ISO 3002 r llAithgs reservde iii Contents Page 1Scope 1 2Normative references 1 3Principle 1 4Application to preparation of gas mixtures 2 4.1Description of the orifice system and the experimental procedure . 2 4.2Area of validity . 4 4.3Operating conditio
11、ns 4 5Calculation of operating parameters and results . 4 5.1Selection of suitable orifice systems 4 5.2Calculation of volume fraction . 5 5.3Sources of uncertainty . 5 5.4Uncertainty of volume fraction 6 Annex A (informative) Premixed gases for preparation of mixtures of high dilution 7 Annex B (in
12、formative) Practical hints . 9 Bibliography . 11 BS ISO 61456:2003 iii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:22:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO -54162:6)E(300 vi ISO 3002 All rithgs reresvde Foreword ISO (the International Organization for Standardization) is a
13、worldwide federation of national standards bodies (ISO member bodies). 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
14、 on that committee. International organizations, governmental and non-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. International Standards are draft
15、ed in accordance with the rules given in the ISO/IEC Directives, Part 2. The main 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 Stan
16、dard 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6145-6 was prepared
17、by Technical Committee ISO/TC 158, Analysis of gases. This second edition cancels and replaces the first edition (ISO 6145-6:1986), which has been technically revised. ISO 6145 consists of the following parts, under the general title Gas analysis Preparation of calibration gas mixtures using dynamic
18、 volumetric methods: Part 1: Methods of calibration Part 2: Volumetric pumps Part 4: Continuous injection method Part 5: Capillary calibration devices Part 6: Critical orifices Part 7: Thermal mass-flow controllers Part 9: Saturation method Part 10: Permeation method Diffusion will be the subject of
19、 a future Part 8 to ISO 6145. Part 3 to ISO 6145, entitled Periodic injections into a flowing gas, has been withdrawn. BS ISO 61456:2003 iv Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:22:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI OSI -54163002:6)E( ISO 3002 r llAithgs reservde v Int
20、roduction This 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. BS ISO 61456:2003 v Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:22:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI License
21、d Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:22:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ANRETNIITOTS LANDNADRAOSI -54163002:6)E( ISO 3002 r llAithgs reservde 1 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 6: Critical orifices 1Scope This part
22、 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 appropriate combinations of orifices and with the use of pure gases, the volume frac
23、tion 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 method depends mainly upon the flow calibration method and the variations in
24、 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 fractions can be obtained (see Annex A). The mass flow rates or volume flow
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