ISO 29463-3-2011 High-efficiency filters and filter media for removing particles in air - Part 3 Testing flat sheet filter media《清除空气微粒用高效过滤器和过滤介质 第3部分 平板过滤介质测试.pdf

1、 Reference number ISO 29463-3:2011(E) ISO 2011INTERNATIONAL STANDARD ISO 29463-3 First edition 2011-10-15 High-efficiency filters and filter media for removing particles in air Part 3: Testing flat sheet filter media Filtres haut rendement et filtres pour llimination des particules dans lair Partie

2、3: Mthode dessai des filtres feuille plate ISO 29463-3:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm,

3、 without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2011 Al

4、l rights reservedISO 29463-3:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv Introduction . v 1 Scope 1 2 Normative references 1 3 Terms and definitions . 1 4 Symbols and abbreviations 1 5 Principle . 3 6 Sampling of sheet filter media . 3 7 Test apparatus . 3 7.1 Test arrangements

5、 for testing with mono-disperse test aerosol . 5 7.2 Test arrangements for testing with a poly-disperse test aerosol 5 7.3 Test filter mounting assembly . 7 7.4 Determination of the filter medium face velocity . 8 8 Requirements for the test air . 8 9 Testing procedure . 9 9.1 Preparatory checks . 9

6、 9.2 Procedure . 9 9.3 Reference test method 10 10 Evaluation 10 11 Test report 11 12 Maintenance and inspection of the test apparatus 11 13 Production test for media . 12 13.1 Measurement of differential pressure . 12 13.2 HEPA filter media penetration test 12 14 Physical property test of filter me

7、dia 12 Annex A (informative) Example of an application with evaluation 13 Annex B (informative) Production testing of filter media . 17 Annex C (informative) Media physical properties . 18 Bibliography 20 ISO 29463-3:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization

8、 for Standardization) 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

9、the right 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. Intern

10、ational 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. Publicati

11、on as 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 right

12、s. ISO 29463-3 was prepared by Technical Committee ISO/TC 142, Cleaning equipment for air and other gases. ISO 29463 consists of the following parts, under the general title High-efficiency filters and filter media for removing particles in air: Part 1: Classification, performance, testing and marki

13、ng Part 2: Aerosol production, measuring equipment, particle-counting statistics Part 3: Testing flat sheet filter media Part 4: Test method for determining leakage of filter element Scan method Part 5: Test method for filter elements ISO 29463-3:2011(E) ISO 2011 All rights reserved vIntroduction IS

14、O 29463 (all parts) is derived from EN 1822 (all parts) with extensive changes to meet the requests from non-EU p-members. It contains requirements, fundamental principles of testing and the marking for high- efficiency particulate air filters with efficiencies from 95 % to 99,999 995 % that can be

15、used for classifying filters in general or for specific use by agreement between users and suppliers. ISO 29463 (all parts) establishes a procedure for the determination of the efficiency of all filters on the basis of a particle counting method using a liquid (or alternatively a solid) test aerosol

16、 and allows a standardized classification of these filters in terms of their efficiency, both local and overall efficiency, which actually covers most requirements of different applications. The difference between ISO 29463 (all parts) and other national standards lies in the technique used for the

17、 determination of the overall efficiency. Instead of mass relationships or total concentrations, this technique is based on particle counting at the most penetrating particle size (MPPS), which, for micro-glass filter mediums, is usually in the range of 0,12 m to 0,25 m. This method also allows test

18、ing ultra-low penetration air filters, which was not possible with the previous test methods because of their inadequate sensitivity. For membrane filter media, separate rules apply, and they are described in ISO 29463-5:2011, Annex B. Although no equivalent test procedures for testing filters with

19、charged media is prescribed, a method for dealing with these types of filters is described in ISO 29463-5:2011, Annex C. Specific requirements for test method, frequency, and reporting requirements can be modified by agreement between supplier and customer. For lower efficiency filters (group H, as

20、described below), alternate leak test methods described in ISO 29463-4:2011, Annex A can be used by specific agreement between users and suppliers, but only if the use of these other methods is clearly designated in the filter markings as described in ISO 29463-4:2011, Annex A. There are differences

21、 between ISO 29463 (all parts) and other normative practices common in several countries. For example, many of these rely on total aerosol concentrations rather than individual particles. For information, a brief summary of these methods and their reference standards are provided in ISO 29463-5:2011

22、 Annex A. INTERNATIONAL STANDARD ISO 29463-3:2011(E) ISO 2011 All rights reserved 1High-efficiency filters and filter media for removing particles in air Part 3: Testing flat sheet filter media 1 Scope This part of ISO 29463 specifies the test procedure for testing the efficiency of flat sheet filt

23、er media. It is intended for use in conjunction with ISO 29463-1, ISO 29463-2, ISO 29463-4 and ISO 29463-5. 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,

24、the latest edition of the referenced document (including any amendments) applies. ISO 29463-1:2011, High-efficiency filters and filter media for removing particles in air Part 1: Classification, performance, testing and marking ISO 29463-2:2011, High-efficiency filters and filter media for removing

25、particles in air Part 2: Aerosol production, measuring equipment, particle-counting statistics ISO 29463-4:2011, High-efficiency filters and filter media for removing particles in air Part 4: Test method for determining leakage of filter element Scan method ISO 29463-5:2011, High-efficiency filters

26、and filter media for removing particles in air Part 5: Test method for filter elements ISO 29464 1) , Cleaning equipment for air and other gases Terminology 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 29463-1, ISO 29463-2 and ISO 29464 apply. 4 S

27、ymbols and abbreviations Table 1 presents the quantities (terms and symbols) used in this part of ISO 29463 to represent measurement variables and calculated values. The values should be inserted in the equation given for these calculations in the units specified. 1) To be published. ISO 29463-3:201

28、1(E) 2 ISO 2011 All rights reservedTable 1 Quantities, symbols and units Term Symbol Unit Equation for the calculation Measured variables Exposed area A cm 2Test volume flow rate V cm 3 /s Pressure drop p Pa Mean particle diameter p d m Particle number N Sampling volume flow rate s V cm 3 /s Samplin

29、g duration t s Calculated quantities Filter medium face velocity u cm/s V u A Mean differential pressure p Pa 1 1 n i i p p n Particle number concentration c Ncm 3N s N c Vt Penetration for particles in size range i P ia ,d, ,u, Ni i Ni c P c bMean penetration P a 1 1 n i i PP n Mean efficiency E a

30、1 EP Number of particles for the upper or lower limit of the 95 % level of confidence N 95 % ISO 29463-2:2011, Clause 7 Penetration as upper limit value for the 95 % level of confidence P 95 %,ia ,d,95 %, 95 %, ,u,95 % , Ni i Ni c P c bMean penetration as upper limit value for the 95 % level of conf

31、idence 95 % P a 95 % 95 %, 1 1 n i i PP n Mean efficiency as lower limit value for the 95 % level of confidence 95 % E a 95 % 95 % 1 EP aThese quantities are usually given as a percentage. bThe index, u, refers to upstream particle counts, and the index, d, refers to downstream particle counts. ISO

32、29463-3:2011(E) ISO 2011 All rights reserved 35 Principle When testing the sheet filter medium, the particle size efficiency is determined using a particle counting method. The testing may use a mono-disperse or a poly-disperse test aerosol. The methods differ in terms of both the production of the

33、aerosol and the particle counter used. Furthermore, the measurement of the pressure drop is made at the prescribed filter medium velocity. Specimens of the sheet filter medium are fixed in a test filter assembly and subjected to the test air flow corresponding to the prescribed filter medium velocit

34、y. The test aerosol from the aerosol generator is conditioned (e.g. vaporization of a solvent), then neutralized, mixed homogeneously with filtered test air and directed to the test filter assembly. In order to determine the efficiency, partial flows of the test aerosol are sampled upstream and down

35、stream of the filter medium. Using a particle counting instrument, the number concentration of the particles contained is determined for various particle sizes. The results of these measurements are used to draw a graph of efficiency against particle size for the filter medium, and to determine the

36、particle size for which the efficiency is a minimum. This particle size is known as the most penetrating particle size (MPPS). When measuring the particles on the upstream side of the filter medium, it can be necessary to use a dilution system in order to reduce the concentration of particles down t

37、o the measuring range of the particle counter used. Additional equipment is required to measure the absolute pressure, temperature and relative humidity of the test aerosol and to measure and control the test volume flow rate. 6 Sampling of sheet filter media The testing of the sheet filter medium s

38、hall be carried out on at least five samples. The samples shall be handled with care; the area being 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) designation of the filter medium; b) upst

39、ream side of the filter medium. 7 Test apparatus The test apparatus being used and the arrangement of the components and measuring equipment are shown in Figure 1. The basic details for the aerosol generation and the aerosol neutralization, together with the details of suitable types of apparatus, a

40、re given in ISO 29463-2. ISO 29463-3:2011(E) 4 ISO 2011 All rights reservedKey 1 filter 9 differential pressure gauge 2 pressure valve 10 dilution system 3 solenoid valve 11 condensation particle counter 4 jet nebulizer 12 measuring equipment for absolute pressure, temperature and relative humidity

41、5 neutralizer 13 volume flow rate meter 6 differential mobility analyser 14 vacuum pump 7 needle valve 15 computer for control and data storage 8 test filter mounting assembly Figure 1 Set-up for testing with mono-disperse test aerosols ISO 29463-3:2011(E) ISO 2011 All rights reserved 57.1 Test arra

42、ngements for testing with mono-disperse test aerosol When testing sheet filter media with a mono-disperse test aerosol, the particle number concentration is determined using a total count method with a condensation particle counter. The arrangement of the test apparatus is shown in Figure 1. The mon

43、o-disperse test aerosol is created in a number of steps. Firstly, a poly-disperse primary aerosol is produced using a jet nebulizer with, for example, a DEHS- or DOP-iso-propanol solution. The particles are reduced to a convenient size for the following process by evaporation of the solvent. The aer

44、osol is then neutralized and passed to a differential mobility analyser. The quasi-mono-disperse test aerosol available at the output of the differential mobility analyser is once again neutralized, and then mixed homogeneously with filtered test air in order to achieve at the test volume flow rate

45、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 analyser 2) . In order to achieve a sufficiently high particle number concentration over the entire test range from 0,

46、04 m to 0,8 m, it can prove necessary to use several jet nebulizers with differing concentrations of the aerosol substances in the solvent. Numerical concentrations that are too high can be adjusted by diluting the test aerosol before the test filter mounting assembly. The number concentration in th

47、e 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 operate under nearly

48、the same conditions, independent of the pressure drop across the tested filter medium. In contrast, the testing system operates with an overpressure, which ensures that leaks in the system do not falsify the test measurements. Particles are counted upstream and downstream from the filter using eithe

49、r two condensation particle 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 included between the sampling point and the counter. 7.2 Test arrangements for testing with a poly-disperse test aerosol When testing sheet filter media with a poly-disperse test aerosol, optic