1、BRITISH STANDARDBS EN ISO 6144:2006Incorporating amendment no. 1 (renumbers BS ISO 6144:2003 as BS EN ISO 6144:2006)Gas analysis Preparation of calibration gas mixtures Static volumetric methodThe European Standard EN ISO 6144:2006 has the status of a British StandardICS 71.040.40g49g50g3g38g50g51g6
2、0g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 6144:2006This British Standard was published under the authority of the Standards Committee and comes into ef
3、fect on 25 March 2003 BSI 2007ISBN 0 580 41469 8National forewordThis British Standard was published by BSI. It is the UK implementation of EN ISO 6144:2006. It is identical with ISO 6144:2003. It supersedes BS 4559-3:1983 which is withdrawn.The UK participation in its preparation was entrusted to T
4、echnical Committee PTI/15, Natural gas and gas analysis.A list of organizations represented on PTI/15 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance wit
5、h a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date Comments16905 28 February 2007 Renumbers BS ISO 6144:2003 as BS EN ISO 6144:2006.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 6144August 2006ICS 71.040.40English VersionGas an
6、alysis - Preparation of calibration gas mixtures - Staticvolumetric method (ISO 6144:2003)Analyse des gaz - Prparation des mlanges de gaz pourtalonnage - Mthode volumtrique statique (ISO6144:2003)Gasanalyse - Herstellung von Prfgasen - Volumetrisch -statisches Verfahren (ISO 6144:2003)This European
7、Standard was approved by CEN on 21 July 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning
8、such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language
9、and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Ne
10、therlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation
11、in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 6144:2006: EForeword The text of ISO 6144:2003 has been prepared by Technical Committee ISO/TC 158 “Analysis of gases” of the International Organization for Standardization (ISO) and has been taken over as EN ISO
12、 6144:2006 by Technical Committee CEN/SS N21 “Gaseous fuels and combustible gas“, the secretariat of which is held by CMC. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2007, and confli
13、cting national standards shall be withdrawn at the latest by February 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Fi
14、nland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 6144:2003 has been approved by CEN as EN ISO 6
15、144:2006 without any modifications. EN ISO 6144:2006Reference numberISO 6144:2003(E)INTERNATIONAL STANDARD ISO6144Second edition2003-02-01Gas analysis Preparation of calibration gas mixtures Static volumetric methodAnalyse des gaz Prparation des mlanges de gaz pour talonnage Mthode volumtrique stati
16、que EN ISO 6144:2006IS:4416 O3002(E) DPlcsid Fremia ihTs PDF file mya ctnoian emdebt dedyfepcaes. In ccacnadrow eitA hebods licnesilop gnic,y tihs file mirp eb yatnde iv roweb detu slahl ton ide ebtlnu deess teh typfecaes wihce era hml era deddebicsnede ti dna onstlalde t noeh comuptfrep reromign ti
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19、ta ta teh serddaig sleb nevwo. ISO 3002 Athgir lls serevr.de selnUs towrehise specfidei, trap on fo thsi ilbupctanoi may cudorper ebtu ro dezilina ni dey fomr yb ro nam y,snae lecetrinoc m roceinahcla, icnliduntohp gcoiypom dna gnicrfoilm, wittuoh mrepissii non writif gnrmo ietI rehSta O tserdda ehs
20、 ebolw or ISOs memreb i ydobn the cnuotfo yr ttseuqer ehe.r ISO cirypothg fofice saCe tsopale 65 eneG 1121-HC 02 avleT. 4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mial coirypthgis.o groWe bwww.is.o groii ISO 3002 Allr ihgtsser edevriiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Term
21、s and definitions .1 4 Principle .2 5 Apparatus.2 6 Procedure for preparing the calibration gas mixture 4 7 Calculation of the volume fraction of the calibration component in the gas mixture7 8 Determination of the uncertainty in the concentration of the calibration component in the gas mixture 9 An
22、nex A (informative) Example of an apparatus suitable for the preparation of calibration gas mixtures by the static volumetric method12 Annex B (informative) Example of determination of the volume of metering syringes 15 Annex C (informative) Example of the determination of the uncertainty in the con
23、centration of a calibration gas mixture prepared by the static volumetric method.17 Annex D (informative) Example of the determination of the stability, as a function of time, of prepared calibration gas mixtures 22 Bibliography29 EN ISO 6144:2006iv Foreword ISO (the International Organization for S
24、tandardization) is a 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 ri
25、ght to be represented 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. Internationa
26、l 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as
27、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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO
28、 6144 was prepared by Technical Committee ISO/TC 158, Analysis of gases. This second edition cancels and replaces the first edition (ISO 6144:1981), which has been technically revised. EN ISO 6144:2006INTENRATIONAL TSANDADR IS:4416 O3002(E)1Gas analysis Preparation of calibration gas mixtures Static
29、 volumetric method 1 Scope This International Standard specifies a method for the preparation of calibration gas mixtures by a static volumetric method and provides a procedure for calculating the volumetric composition of the mixture. It can be used either with binary gas mixtures (containing one c
30、alibration component in a complementary gas, which is usually nitrogen or air1, 2) or with mixtures containing more than one component in the complementary gas. This International Standard also specifies how the expanded uncertainty in the volume fraction of each calibration component in the mixture
31、 is determined by a rigorous evaluation of all the measurement uncertainties involved, including those associated with the apparatus used for the preparation of the gas mixture and those associated with the experimental procedure itself. NOTE 1 This International Standard is generally applicable to
32、the preparation of calibration gas mixtures containing calibration components in the concentration range 10 109(10 ppb parts per billion) to 50 106(50 ppm parts per million) by volume. However, gas mixtures may be prepared at larger or smaller volume fractions, provided that the components used in t
33、he static dilution process are selected appropriately. NOTE 2 A relative expanded uncertainty of not greater than 1 % at a level of confidence of 95 % may be achievable at these concentrations, provided that: the purities of the parent gases have been determined by analysis and any significant impur
34、ities and the uncertainties in their measured concentrations have been taken into account; no significant adsorption effects or chemical reactions occur between the gaseous constituents and the internal surfaces of the apparatus, and there are no reactions between any of the gaseous components, i.e.
35、 between the calibration component and complementary gas or between the calibration components themselves; all the relevant apparatus used in the preparation of a calibration gas mixture have been calibrated with assigned measurement uncertainties which are appropriate to calculating the final expan
36、ded uncertainty for the calibration gas mixture prepared. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (inc
37、luding any amendments) applies. ISO 7504, Gas analysis Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 7504 apply. EN ISO 6144:20062 4 Principle A calibration gas mixture consists of one of more calibration components in a complementary (d
38、iluent) gas, mixed in a suitable gas-mixing chamber. These calibration components are generally pure gases taken from cylinders, or from pure, volatile liquids that are allowed to evaporate into the gas-mixing chamber. The gas mixture is prepared using syringes to inject: either known volumes of gas
39、eous calibration components (each at a pressure of about 1 105Pa); or known masses or volumes of liquid calibration components; These are injected into a volume of complementary gas contained in the mixing chamber (which is also at a pressure of about 1 105Pa). Further complementary gas is then adde
40、d to increase the overall pressure of the gas mixture to an accurately measured value above ambient atmospheric pressure. This final (above-atmospheric) pressure is required so that the calibration gas mixture will subsequently flow out of the mixing chamber and can be used to calibrate a gas analys
41、er, which is usually operated at ambient pressure. At each stage in the preparation procedure, the mixture is homogenized, usually by means of a suitable stirring device, and then left to equilibrate to ambient atmospheric temperature. The volume fraction of each calibration component in the calibra
42、tion gas mixture is determined by calculation of the ratio of the volume of the calibration component to the total volume of the mixture. 5 Apparatus 5.1 Gas-mixing chamber, consisting of the components specified in 5.1.1 to 5.1.8. NOTE An example of a suitable gas-mixing chamber is described in Ann
43、ex A. 5.1.1 Vessel, comprising the gas-mixing chamber itself, of sufficient internal volume to deliver the amount of calibration gas mixture required for any subsequent instrumental calibrations, manufactured of a suitable material that is inert to all the component gases, and designed both to be ev
44、acuable and to withstand the required above-atmospheric operating pressures. It shall also have vacuum/high-pressure flanges to allow access to the components that are mounted within the mixing chamber. NOTE 1 Vessels with internal volumes of 0,1 m3to 0,5 m3, capable of operating up to pressures of
45、about 2 105Pa (2 bar) and of maintaining a vacuum of better than 0,1 102Pa (0,1 mbar), have been found to be suitable (see Annex A). NOTE 2 Mixing chambers manufactured from borosilicate glass or stainless steel have been found to be suitable for the commonly used gaseous species (e.g. gas mixtures
46、which contain SO2, NO, NO2, CO and C6H6as the calibration components). However, care shall be taken in selecting the materials of the mixing chamber, and of the other components which come into contact with the gas mixtures, so that they do not affect the mixtures stability adversely particularly wh
47、en more reactive gas mixtures are to be prepared. 5.1.2 Vacuum pump, capable of evacuating the mixing chamber and its associated components to a low pressure, and including a suitable vacuum shut-off valve. This low pressure shall be defined either so that any gaseous contamination resulting from th
48、e residual low pressure has no effect on the accuracy of the concentration of the gas mixture prepared, or so that a quantitative correction for the effect of this residual low pressure may be made to the concentration of the mixture. NOTE The residual gas pressure is generally due mainly to nitroge
49、n from residual air. However, care must be taken to ensure that other gases that may react with the constituents of the gas mixture are not present at significant concentrations in this residual gas (e.g. traces of water vapour when acid gases are being used as calibration components, or traces of oxygen in the case when nitric oxide calibration mixtures are being prepared). 5.1.3 Gas line, used for the injection of the complementary gas, and including appropriate metering and shut-off valves. EN ISO 6144:20063
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