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1、BRITISH STANDARD BS EN 13274-7:2002 Respiratory protective devices Methods for test Part 7: Determination of particle filter penetration The European Standard EN 13274-7:2002 has the status of a British Standard ICS 13.340.30 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:16:54 GMT+00:0
2、0 2006, Uncontrolled Copy, (c) BSI BS EN 13274-7:2002 This British Standard, having been prepared under the direction of the Health and Environment Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 6 January 2003 BSI 6 January 2
3、003 ISBN 0 580 41088 9 National foreword This British Standard is the official English language version of EN 13274-7:2002. It supersedes BS 4400:1969, which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee PH/4, Respiratory protection, to Subcommittee PH/4/
4、9, Test methods and interpretation, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be
5、 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 necessary provisions of a contract. Users are
6、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 interpretation, or proposals for change, and k
7、eep 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 EN title page, pages 2 to 16, an inside back cover and a back cover. The BSI copyright date display
8、ed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:16:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13274-7 December
9、2002 ICS 13.340.30 English version Respiratory protective devices - Methods of test - Part 7: Determination of particle filter penetration Appareils de protection respiratoire - Mthodes dessai - Partie 7: Dtermination de la pntration des filtres particules Atemschutzgerte - Prfverfahren - Teil 7: Be
10、stimmung des Durchlasses von Partikelfiltern This European Standard was approved by CEN on 23 October 2002. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterat
11、ion. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translatio
12、n under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
13、Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2002 CENAll rights of exploitation in any form
14、and by any means reserved worldwide for CEN national Members. Ref. No. EN 13274-7:2002 E Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:16:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13274-7:2002 (E) 2 Contents page Foreword3 Introduction.3 1Scope 3 2Normative references 4 3Terms and
15、 definitions4 4Pre-requisites.4 5General test requirements 5 6Sodium chloride test method .5 6.1Principle5 6.2Test equipment 5 6.3Test conditions 6 6.4Procedure .6 6.5Calculation of the penetration6 7Paraffin oil test method.7 7.1Principle7 7.2Test equipment 7 7.3Test conditions at filter .7 7.4Proc
16、edure .7 7.5Calculation of the penetration8 Annex A (normative) Test results - Uncertainty of measurements.15 Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives16 Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:16
17、:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13274-7:2002 (E) 3 Foreword This document (EN 13274-7:2002) has been prepared by Technical Committee CEN/TC 79 “Respiratory protective devices“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national s
18、tandard, either by publication of an identical text or by endorsement, at the latest by June 2003, and conflicting national standards shall be withdrawn at the latest by June 2003. This document has been prepared under a mandate given to CEN by the European Union and the European Free Trade Associat
19、ion, and supports essential requirements of EU Directive(s). For the relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. It is one of several parts, which are as follows: Part 1: Determination of inward leakage and total inward leakage Part 2: Pra
20、ctical performance tests Part 3: Determination of breathing resistance Part 4: Flame tests Part 5: Climatic conditions Part 6: Determination of carbon dioxide content of the inhalation air Part 7: Determination of particle filter penetration Part 8: Determination of dolomite dust clogging Annex A is
21、 normative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Nethe
22、rlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Introduction This European Standard is intended as a supplement to the specific device standards for respiratory protective devices. Test methods are specified for complete or parts of devices. If deviations from the test m
23、ethod given in this standard are necessary, these deviations will be specified in the relevant device standard. 1 Scope This European Standard specifies the procedure for testing particle filter penetration for respiratory protective devices. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09
24、:16:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13274-7:2002 (E) 4 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are
25、listed hereafter. For dated references, subsequent amendments to, or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
26、EN 132, Respiratory protective devices Definitions of terms and pictograms. 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 132 together with the following apply. 3.1 ambient conditions atmosphere where the temperature is (16 to 32) C and the
27、 relative humidity is (20 to 80) % 3.2 dry atmosphere atmosphere where the relative humidity is less than 20 % 3.3 wet atmosphere atmosphere where the relative humidity is greater than or equal to 95 % 4 Pre-requisites In order to implement this Part of EN 13274, at least the following parameters ne
28、ed to be specified in the appropriate device standard: items to be tested; number of samples; test method; flow rate through the filter; sequence of conditioning phases, where more than one is required; specification of any observations to be carried out; sample preparation and orientation; sample h
29、olding; pass/fail criteria; any deviations from this method. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:16:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13274-7:2002 (E) 5 5 General test requirements Unless otherwise specified, the values stated in this European Standard are expres
30、sed as nominal values. Except for temperature limits, values which are not stated as maxima or minima shall be subject to a tolerance of + 5 %. Unless otherwise specified, the ambient temperature for testing shall be between 16 C and 32 C and the temperature limits shall be subject to an accuracy of
31、 + 1 C. 6 Sodium chloride test method 6.1 Principle An aerosol of sodium chloride particles is generated by atomizing an aqueous solution of the salt and evaporating the water. The concentration of this aerosol is measured before and after the filter under test by means of flame photometry. Accurate
32、 determinations are possible in the range 0,001 % to 100 % filter penetration. When an alternative design of test equipment to that given in 6.2 is used, it shall be correlated directly with this reference method and shall be shown to be equivalent over the whole of the operational range. 6.2 Test e
33、quipment The apparatus is shown schematically in Figure 1. The aerosol is generated by using a Collison atomizer filled with a 1 % solution of sodium chloride. The atomizer, an example of which is shown in Figure 2, consists of a glass reservoir into which is sealed an atomizer head having three spr
34、ay nozzles. Air is supplied to the atomizer at a pressure of 3,45 bar and the resulting liquid spray impinges on a baffle which removes the large particles. The particles which do not impact are removed in the air flow and, on mixing with dry air, the water evaporates leaving a dry sodium chloride a
35、erosol. The aerosol produced by this method is polydisperse with a mass median particle diameter of approximately 0,6 m. The particle size distribution is given in Figure 3. It has been found that the aerosol remains constant, within acceptable limits, with respect to particle size and concentration
36、 provided that the supply pressure is in the range from 3,3 bar to 3,6 bar and the flow rate of air to the three nozzles is from 12,5 I/min to 13,0 I/min. The output is mixed with 82 I/min of dry air in a chamber with a minimum volume of 1 750 cm3 giving a total flow rate of 95 l/min. NOTE 1 The sod
37、ium chloride solution in the atomizer is consumed at a rate of approximately 15 ml/h. This loss is due in part to the atomization of the solution and in part to evaporation of water from the reservoir. The volume of the reservoir is such that the change in concentration and loss in volume of the sol
38、ution during an 8 h period will not cause an appreciable change in the characteristics of the test aerosol. The sodium chloride aerosol is analysed before and after the filter under test by flame photometry. The photometer used for this analysis can be any suitable instrument having the required sen
39、sitivity, however, a photometer specially designed to meet these requirements is available. NOTE 2 Information concerning the supplier of the photometer and the aerosol generator can be obtained from the secretariat of CEN/TC 79. In the photometer, the hydrogen burner is housed in a vertical flame t
40、ube through which the aerosol to be analysed flows. The hydrogen burner, which gives a flame symmetrical about the vertical axis, is surrounded by a heat proof glass tube. This tube shall be optically homogeneous to minimize the effect on the light emitted by the flame. Sodium chloride particles in
41、air passing through the flame tube are vapourized giving the characteristic sodium emission at 589 nm. The intensity of this emission is proportional to the concentration of sodium in the air flow. The intensity of the light emitted by the flame is measured by using a photomultiplier tube. To separa
42、te the sodium emission from background light of other wavelengths, a narrow band interference filter with appropriate sideband filters is used. This filter should preferably have a half-peak band width of no more than 5 nm. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:16:54 GMT+00:00 20
43、06, Uncontrolled Copy, (c) BSI EN 13274-7:2002 (E) 6 As the photomultiplier output is only proportional to the incident light over a relatively small range, high light intensities are attenuated by neutral density filters. These filters are accurately calibrated in conjunction with the interference
44、filter in use and so the actual light intensity can be calculated from the output of the photomultiplier. The signal from the photomultiplier is amplified and recorded. 6.3 Test conditions Particle size distribution of the test aerosol at the test chambersee Figure 3 Test aerosol concentration at th
45、e test chamber(4 to 12) mg/m3 Relative humidity of the test aerosol at the test chamberless than 60 % Flow rate of test aerosol from the generator95 l/min Air pressure to atomizer(3,3 to 3,6) bar Flow rate to atomizer(12,5 to 13,0) I/min Flow rate of diluting air82 l/min NOTE Flow rate of hydrogen t
46、o photometer, 450 ml/min to 500 ml/min (typical) 6.4 Procedure The test aerosol is fed into the test chamber, where the filter under test is fixed. The specified flow is passed through the filter and the aerosol concentration is measured immediately before and after the filter by the photometer. Whe
47、re the specified flow is less than 95 l/min, a bleed shall be incorporated to reduce the flow through the filter to the required rate. Where the specified flow through the filter is greater than 95 l/min, a supply of clean air of less than 60 % relative humidity shall be added to the output of the a
48、erosol generator so as to obtain the required flow rate. The air shall be added prior to the test chamber so as to ensure a homogeneous aerosol concentration within the test chamber. This procedure will also have the effect of reducing the aerosol concentration before the filter which shall be taken
49、 into account when calculating the filter penetration in accordance with 6.5. The test aerosol is fed into the test chamber where the filter under test is fixed. A flow of 95 l/min is blown through the filter and the aerosol concentration is measured immediately before and after the filter by the photometer. The measurement of penetration shall be taken as the average over a time of (30 + 3) s, beginning 3 minutes after the start of the aerosol test. 6.5 Calculation o
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