1、BS EN1822-3:2009ICS 13.040.40; 23.120NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDHigh efficiency airfilters (EPA, HEPA andULPA)Part 3: Testing flat sheet filter mediaThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCom
2、mittee on 31 December2009 BSI 2009ISBN 978 0 580 61792 8Amendments/corrigenda issued since publicationDate CommentsBS EN 1822-3:2009National forewordThis British Standard is the UK implementation of EN 1822-3:2009. Itsupersedes BS EN 1822-3:1998 which is withdrawn.The UK participation in its prepara
3、tion was entrusted to TechnicalCommittee MCE/21/3, Air filters other than for air supply for I.C.engines and compressors.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a cont
4、ract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 1822-3:2009EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1822-3 November 2009 ICS 13.040.40 Supersedes EN 1822-3:1998English Version High efficiency ai
5、r filters (EPA, HEPA and ULPA) - Part 3: Testing flat sheet filter media Filtres air haute efficacit (EPA, HEPA et ULPA) - Partie 3: Essais de medias filtrants plans Schwebstofffilter (EPA, HEPA und ULPA) - Teil 3: Prfung des planen Filtermediums This European Standard was approved by CEN on 17 Octo
6、ber 2009. 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 alteration. Up-to-date lists and bibliographical references concerning such national standards may be obt
7、ained on application to the CEN 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 translation under the responsibility of a CEN member into its own language and notified to the CEN Manag
8、ement Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Nor
9、way, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form
10、 and by any means reserved worldwide for CEN national Members. Ref. No. EN 1822-3:2009: EBS EN 1822-3:2009EN 1822-3:2009 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Terms and definitions .54 Symbols and abbreviations 55 Description of the test method .76 Sampling
11、of sheet filter media 77 Test apparatus .77.1 General 77.2 Test arrangements for testing with monodisperse test aerosol .77.3 Test arrangements for testing with a polydisperse test aerosol . 107.4 Test filter mounting assembly . 127.4.1 General . 127.4.2 Measurement of differential pressure 137.4.3
12、Sampling 137.5 Determination of the filter medium face velocity 148 Requirements for the test air . 149 Testing procedure. 149.1 Preparatory checks 149.2 Procedure 159.2.1 General . 159.2.2 Measurement of the pressure drop . 159.2.3 Testing with a monodisperse test aerosol . 159.2.4 Testing with a p
13、olydisperse test aerosol . 159.3 Reference test method . 1510 Evaluation 1611 Test report . 1612 Maintenance and inspection of the test apparatus . 17Annex A (informative) Example of an application with evaluation . 18A.1 Testing the sheet filter medium . 18A.1.1 General . 18A.1.2 Measurement of the
14、 differential pressure 18A.1.3 Particle counting . 18A.2 Calculation of the arithmetic means . 19A.2.1 General . 19A.2.2 Mean differential pressure . 19A.2.3 Mean efficiency E . 19A.2.4 Mean efficiencies E95%as lower limit values for the 95 % confidence interval 20A.3 Representation of the efficienc
15、y curve 21Bibliography . 23BS EN 1822-3:2009EN 1822-3:2009 (E) 3 Foreword This document (EN 1822-3:2009) has been prepared by Technical Committee CEN/TC 195 “Air filters for general air cleaning”, the secretariat of which is held by UNI. This European Standard shall be given the status of a national
16、 standard, either by publication of an identical text or by endorsement, at the latest by May 2010, and conflicting national standards shall be withdrawn at the latest by May 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. C
17、EN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1822-3:1998. It is dealing with the performance testing of efficient particulate air filters (EPA), high efficiency particulate air filters (HEPA) and ultra low penetration air
18、filters (ULPA). The series of standards EN 1822, High efficiency air filters (EPA, HEPA and ULPA) consists of the following parts: Part 1: Classification, performance testing, marking Part 2: Aerosol production, measuring equipment, particle counting statistics Part 3: Testing flat sheet filter medi
19、a Part 4: Determining leakage of filter elements (scan method) Part 5: Determining the efficiency of filter elements As decided by CEN/TC 195, this European Standard is based on particle counting methods which actually cover most needs of different applications. The difference between this European
20、Standard and previous national standards lies in the technique used for the determination of the integral efficiency. Instead of mass relationships, this new technique is based on particle counting at the most penetrating particle size (MPPS; range: 0,12 m to 0,25 m). It also allows ultra low penetr
21、ation air filters to be tested, which is not possible with the previous test methods because of their inadequate sensitivity. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Bel
22、gium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 1822-3:2009
23、EN 1822-3:2009 (E) 4 Introduction As decided by CEN/TC 195, this European Standard is based on particle counting methods which actually cover most needs of different applications. The difference between this European Standard and previous national standards lies in the technique used for the determi
24、nation of the integral efficiency. Instead of mass relationships, this technique is based on particle counting at the most penetrating particle size (MPPS), which is for micro-glass filter mediums usually in the range of 0,12 m to 0,25 m. For Membrane filter media, separate rules apply, see Annex A
25、of EN 1822-5:2009. This method also allows to test ultra low penetration air filters, which was not possible with the previous test methods because of their inadequate sensitivity. BS EN 1822-3:2009EN 1822-3:2009 (E) 5 1 Scope This European Standard applies to high efficiency particulate air filters
26、 and ultra low penetration air filters (EPA, HEPA and ULPA) used in the field of ventilation and air conditioning and for technical processes, e.g. for applications in clean room technology or pharmaceutical industry. It establishes a procedure for the determination of the efficiency on the basis of
27、 a particle counting method using a liquid test aerosol, and allows a standardized classification of these filters in terms of their efficiency. This European Standard applies to testing sheet filter media used in high efficiency air filters. The procedure includes methods, test assemblies and condi
28、tions for carrying out the test, and the basis for calculating results. 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
29、 document (including any amendments) applies. EN 1822-1:2009, High efficiency air filters (EPA, HEPA and ULPA) Part 1: Classification, performance testing, marking EN 1822-2:2009, High efficiency air filters (EPA, HEPA and ULPA) Part 2: Aerosol production, measuring equipment, particle counting stat
30、istics EN 14799:2007, Air filters for general air cleaning Terminology 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 14799:2007 apply. 4 Symbols and abbreviations Table 1 contains the quantities (terms and symbols) used in this standard to represent
31、 measurement variables and calculated values. The values inserted in the equation given for these calculations should be in the units specified. BS EN 1822-3:2009EN 1822-3:2009 (E) 6 Table 1 Quantities Term Symbol Unit Equation for the calculation Measured variables Exposed area A cm Test volume flo
32、w rate Vthe area to be tested shall be free from all folds, kinks, holes or other irregularities. All samples shall be clearly and permanently marked with the following details: a) The designation of the filter medium; b) The upstream side of the filter medium. 7 Test apparatus 7.1 General The test
33、apparatus to be used and the arrangement of the components and measuring equipment are shown in Figure 1 of EN 1822-1:2009. The basic details for the aerosol generation and the aerosol neutralisation, together with the details of suitable types of apparatus are contained in EN 1822-2. 7.2 Test arran
34、gements for testing with monodisperse test aerosol When testing sheet filter media with a monodisperse test aerosol the particle number concentration is determined using a total count method with a condensation nucleus counter. The arrangement of the test apparatus is shown in Figure 1. The monodisp
35、erse test aerosol is created in a number of steps. Firstly a polydisperse primary aerosol is produced using a jet nebuliser with, for example, a DEHS/Iso-propanol solution. The particles are reduced to a BS EN 1822-3:2009EN 1822-3:2009 (E) 8 convenient size for the following process by evaporation o
36、f the solvent. The aerosol is then neutralised and passed to a differential mobility analyser. The quasi-monodisperse test aerosol available at the output of the differential mobility analyser is once again neutralised, and then mixed homogeneously with filtered test air in order to achieve at the t
37、est volume flow rate required for the filter medium velocity. The mean particle diameter of the number distribution is varied by adjusting the voltage between the electrodes of the differential mobility analyzer1)In order to achieve a sufficiently high particle number concentration over the entire t
38、est range from 0,04 m to 0,8 m it may prove necessary to use several jet nebulizers with differing concentrations of the aerosol substances in the solvent. Numerical concentrations which are too high can be adjusted by diluting the test aerosol before the test filter mounting assembly. The number co
39、ncentration in the test aerosol shall be selected so that no dilution is necessary for the measurements made downstream from the filter. A pump positioned downstream draws the test aerosol through the test filter mounting assembly. This ensures that the differential mobility analyser can always oper
40、ate under nearly the same conditions, independent of the pressure drop across the tested filter medium. In contrast, where the testing system operates with an overpressure this ensures that leaks in the system do not falsify the test measurements. Particles are counted upstream and downstream from t
41、he filter using either two condensation nucleus counters in parallel, or using only one such counter to measure the upstream and downstream concentrations alternately. If the level of the upstream number concentration exceeds the measuring range of the counter then a dilution system shall be include
42、d between the sampling point and the counter. 1) Actually, the adjustment gives the mode of number distribution. This can be taken as equal to the median value with sufficient accuracy. BS EN 1822-3:2009EN 1822-3:2009 (E) 9 Key 1 Filter 2 Pressure valve 3 Solenoid valve 4 Jet nebuliser 5 Neutraliser
43、 6 Differential mobility analyser 7 Needle valve 8 Test filter mounting assembly 9 Differential pressure gauge 10 Dilution system 11 Condensation nucleus counter 12 Measuring equipment for absolute pressure, temperature and relative humidity 13 Volume flow rate meter 14 Vacuum pump 15 Computer for c
44、ontrol and data storage Figure 1 Setup for testing with monodisperse test aerosols BS EN 1822-3:2009EN 1822-3:2009 (E) 10 7.3 Test arrangements for testing with a polydisperse test aerosol When testing sheet filter media with a polydisperse test aerosol optical particle counters are used, which dete
45、rmine the number distribution and the number concentration of the test aerosol. The tests can be carried out directly with the polydisperse, neutralised primary aerosol. In order to cover the test range it may be necessary to use several jet nebulisers with different concentrations of the aerosol su
46、bstance in the solvent. The mean particle diameter of the number distribution shall not lie outside the test range of 0,04 m to 0,8 m. The arrangement of the test apparatus is shown in Figure 2. Instead of the single or two parallel condensation nucleus counters, optical particle counters are used t
47、o determine the number distribution and the number concentration of the polydisperse test aerosol on the upstream and downstream sides of the filter medium. When testing with a polydisperse test aerosol and particle counting and sizing equipment it is also necessary to ensure that the number concent
48、ration of the test aerosol is adjusted to suit the measuring range of the particle counter if necessary by the inclusion of a dilution system. BS EN 1822-3:2009EN 1822-3:2009 (E) 11 Key 1 Filter 2 Pressure reduction valve 3 Jet nebuliser 4 Neutraliser 5 Test filter mounting assembly 6 Differential p
49、ressure gauge 7 Dilution system 8 Optical Particle Counter 9 Needle valve 10 Vacuum pump 11 Measuring equipment for absolute pressure, temperature and relative humidity 12 Volume flow rate meter 13 Computer for control and data storage Figure 2 Setup for testing with polydisperse test aerosols BS EN 1822-3:2009EN 1822-3:2009 (E) 12 7.4 Test filter mounting assembly 7.4.1 General The test fil
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