SIST EN 13274-7:2003
(Main)Respiratory protective devices - Methods of test - Part 7: Determination of particle filter penetration
Respiratory protective devices - Methods of test - Part 7: Determination of particle filter penetration
This European Standard specifies the procedure for testing particle filter penetration for respiratory protective devices.
Atemschutzgeräte - Prüfverfahren - Teil 7: Bestimmung des Durchlasses von Partikelfiltern
Diese Europäische Norm legt das Verfahren zum Messen des Aerosoldurchlasses von Partikelfiltern für Atemschutzgeräte fest.
Appareils de protection respiratoire - Méthodes d'essai - Partie 7: Détermination de la pénétration des filtres a particules
La présente Norme européenne spécifie le mode opératoire utilisé pour vérifier la pénétration des filtres à particules pour appareils de protection respiratoire.
Oprema za varovanje dihal - Metode preskušanja - 7. del: Ugotavljanje penetracije delcev v filter
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Respiratory protective devices - Methods of test - Part 7: Determination of particle filter penetrationOprema za varovanje dihal - Metode preskušanja - 7. del: Ugotavljanje penetracije delcev v filterAppareils de protection respiratoire - Méthodes d'essai - Partie 7: Détermination de la pénétration des filtres a particulesAtemschutzgeräte - Prüfverfahren - Teil 7: Bestimmung des Durchlasses von PartikelfilternTa slovenski standard je istoveten z:EN 13274-7:2002SIST EN 13274-7:2003en13.340.30ICS:SLOVENSKI
STANDARDSIST EN 13274-7:200301-april-2003
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13274-7December 2002ICS 13.340.30English versionRespiratory protective devices - Methods of test - Part 7:Determination of particle filter penetrationAppareils de protection respiratoire - Méthodes d'essai -Partie 7: Détermination de la pénétration des filtres àparticulesAtemschutzgeräte - Prüfverfahren - Teil 7: Bestimmung desDurchlasses von PartikelfilternThis 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 EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13274-7:2002 E
Test results - Uncertainty of measurements.15Annex ZA (informative)
Clauses of this European Standard addressing essential requirements orother provisions of EU Directives.16
together with the followingapply.3.1ambient conditionsatmosphere where the temperature is (16 to 32) °C and the relative humidity is (20 to 80) %3.2dry atmosphereatmosphere where the relative humidity is less than 20 %3.3wet atmosphereatmosphere where the relative humidity is greater than or equal to 95 %4 Pre-requisitesIn order to implement this Part of EN 13274, at least the following parameters need to be specified in theappropriate device standard:¾ items to be tested;¾ number of samples;¾ test method;¾ flow rate through the filter;¾ sequence of conditioning phases, where more than one is required;¾ specification of any observations to be carried out;¾ sample preparation and orientation;¾ sample holding;¾ pass/fail criteria;¾ any deviations from this method.
The sodium chloride solution in the atomizer is consumed at a rate of approximately 15 ml/h. This loss is due in part tothe atomization of the solution and in part to evaporation of water from the reservoir. The volume of the reservoir is such that thechange in concentration and loss in volume of the solution during an 8 h period will not cause an appreciable change in thecharacteristics of the test aerosol.The sodium chloride aerosol is analysed before and after the filter under test by flame photometry. The photometerused for this analysis can be any suitable instrument having the required sensitivity, however, a photometerspecially 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 secretariatof CEN/TC 79.In the photometer, the hydrogen burner is housed in a vertical flame tube through which the aerosol to be analysedflows. The hydrogen burner, which gives a flame symmetrical about the vertical axis, is surrounded by a heat proofglass tube. This tube shall be optically homogeneous to minimize the effect on the light emitted by the flame.Sodium chloride particles in air passing through the flame tube are vapourized giving the characteristic sodiumemission 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 separate the sodiumemission from background light of other wavelengths, a narrow band interference filter with appropriate sidebandfilters is used. This filter should preferably have a half-peak band width of no more than 5 nm.
Flow rate of hydrogen to photometer, 450 ml/min to 500 ml/min (typical)6.4 ProcedureThe test aerosol is fed into the test chamber, where the filter under test is fixed. The specified flow is passedthrough the filter and the aerosol concentration is measured immediately before and after the filter by thephotometer.Where the specified flow is less than 95 l/min, a bleed shall be incorporated to reduce the flow through the filter tothe required rate.Where the specified flow through the filter is greater than 95 l/min, a supply of clean air of less than 60 % relativehumidity shall be added to the output of the aerosol generator so as to obtain the required flow rate. The air shallbe 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 takeninto account when calculating the filter penetration in accordance with 6.5.The test aerosol is
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