DIN EN 1822-4-2011 High efficiency air filters (EPA HEPA and ULPA) - Part 4 Determining leakage of filter elements (scan method) German version EN 1822-4 2009《高效空气过滤器(EPA HEPA和ULPA.pdf

1、January 2011 Translation by DIN-Sprachendienst.English price group 17No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC

2、S 13.040.40!$l“1739898www.din.deDDIN EN 1822-4High efficiency air filters (EPA, HEPA and ULPA) Part 4: Determining leakage of filter elements (scan method)English translation of DIN EN 1822-4:2011-01Schwebstofffilter (EPA, HEPA und ULPA) Teil 4: Leckprfung des Filterelementes (Scan-Verfahren)Englisc

3、he bersetzung von DIN EN 1822-4:2011-01Filtres air haute efficacit (EPA, HEPA et ULPA) Partie 4: Essais detanchit de llment filtrant (mthode dexploration)Traduction anglaise de DIN EN 1822-4:2011-01SupersedesDIN EN 1822-4:2001-02www.beuth.deDocument comprises pagesIn case of doubt, the German-langua

4、ge original shall be considered authoritative.4401.11 DIN EN 1822-4:2011-01 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 195 “Air filters for general air cleaning” (Secretariat: UNI, Italy). The responsible German body invol

5、ved in its preparation was the Normenausschuss Maschinenbau (Mechanical Engineering Standards Committee), Working Committee NA 060-09-21-02 AK Schwebstofffilter of Section Allgemeine Lufttechnik. Representatives of stakeholders, manufacturers and users of high efficiency air filters, and of research

6、 and testing institutes contributed to this standard. The European Standards and the International Standard referred to in Clause 2 have been published as the corresponding DIN EN or DIN EN ISO Standards with the same number. EN 1822 comprises 5 parts, which have been revised and published in 2009 a

7、s European Standards. Amendments This standard differs from DIN EN 1822-4:2001-02 as follows: a) an alternative test method using a solid (instead of a liquid) test aerosol has been added; b) a method for testing and classification of filters made out of membrane type filter media has been added; c)

8、 a method for testing and classification of filters made out of synthetic fibre media has been added; d) a new group “E” for efficient particulate air filters (EPA) has been added; e) an alternative method for leak testing of group H filters with other than panel shape has been added; f) editorial c

9、orrections have been implemented. Previous editions DIN 24184: 1974-10, 1990-12 DIN EN 1822-4: 2001-02 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1822-4 November 2009 ICS 13.040.40 Supersedes EN 1822-4:2000English Version High efficiency air filters (EPA, HEPA and ULPA) - Part 4: Determini

10、ng leakage of filter elements (scan method) Filtres air haute efficacit (EPA, HEPA et ULPA) - Partie 4: Essais dtanchit de llment filtrant (mthode dexploration) Schwebstofffilter (EPA, HEPA und ULPA) - Teil 4: Leckprfung des Filterelementes (Scan-Verfahren) This European Standard was approved by CEN

11、 on 17 October 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

12、 may be obtained 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 th

13、e CEN Management 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, Nethe

14、rlands, Norway, 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

15、in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1822-4:2009: EContents Page Foreword 4Introduction 51 Scope .62 Normative references .63 Terms and definitions 64 Description of the procedure 75 Test filter 86 Test apparatus 86.1 Set-up of the test apparatus 86.2

16、 Test duct . 116.2.1 Test air conditioning . 116.2.2 Adjustment of the volume flow rate . 116.2.3 Measurement of the volume flow rate . 116.2.4 Aerosol mixing duct 116.2.5 Test filter mounting assembly 116.2.6 Measuring points for the pressure difference 116.2.7 Sampling, upstream 116.2.8 Screening

17、. 126.3 Scanning assembly . 126.3.1 General . 126.3.2 Sampling, downstream . 126.3.3 Probe arm . 136.3.4 Aerosol transport lines . 136.3.5 Provisions to move the probe 136.4 Aerosol generation and measurement techniques 136.4.1 General . 136.4.2 Set-up for testing with a monodisperse test aerosol .

18、146.4.3 Set-up for testing with a polydisperse test aerosol . 147 Test air 148 Test procedure . 158.1 General . 158.2 Preparatory checks . 158.3 Starting up the aerosol generator 168.4 Preparing the test filter . 168.4.1 Installing the test filter 168.4.2 Flushing the test filter . 168.5 Testing 168

19、.5.1 Measuring the pressure drop . 168.5.2 Testing with monodisperse test aerosol . 178.5.3 Testing with polydisperse test aerosol . 178.5.4 Leak testing (local penetration) . 178.5.5 Determining the mean efficiency of the filter element . 179 Evaluation . 189.1 Calculating the penetration and the e

20、fficiency . 189.2 Local penetration . 199.3 Mean efficiency 202EN 1822-4:2009 (E) DIN EN 1822-4:2011-01 9.4 Classification 2010 Test report . 2011 Maintenance and inspection of the test apparatus . 21Annex A (normative) Oil Thread Leak Test . 23Annex B (normative) Determining the test parameters . 2

21、4B.1 General 24B.2 Boundary conditions 24B.3 Test filter data . 24B.4 Data for the apparatus . 25B.4.1 Particle counters 25B.4.2 Downstream sampling probes 25B.4.3 Loss factor 26B.5 Sequence of calculation steps 26B.6 Checking the isokinetic sampling 27B.7 Choosing the probe speed 28B.8 Minimum aero

22、sol concentration . 29B.9 Maximum aerosol concentration 30B.10 Leak signal 31B.10.1 Effective value 31B.10.2 Signal difference . 32Annex C (informative) Example of an application with evaluation . 34Annex D (informative) Leak Test with solid PSL Aerosol 37D.1 Background . 37D.2 General Remarks 37D.3

23、 Test Procedure . 37D.4 Test Protocol . 39Annex E (informative) 0,3 m 0,5 m Particle Efficiency Leak Test 40Bibliography . 423EN 1822-4:2009 (E) DIN EN 1822-4:2011-01 Foreword This document (EN 1822-4:2009) has been prepared by Technical Committee CEN/TC 195 “Air filters for general air cleaning”, t

24、he secretariat of which is held by UNI. 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 May 2010, and conflicting national standards shall be withdrawn at the latest by May 2010. Attention is draw

25、n to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1822-4:2000. It contains requirements, fundamental principles of testing an

26、d the marking for efficient particulate air filters (EPA), high efficiency particulate air filters (HEPA) and ultra low penetration air filters (ULPA). The complete European Standard EN 1822, High efficiency air filters (EPA, HEPA and ULPA) will consist of the following parts: Part 1: Classification

27、, performance testing, marking Part 2: Aerosol production, measuring equipment, particle counting statistics Part 3: Testing flat sheet filter media Part 4: Determining leakage of filter elements (scan method) Part 5 : Determining the efficiency of filter elements According to the CEN/CENELEC Intern

28、al Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malt

29、a, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. 4EN 1822-4:2009 (E) DIN EN 1822-4:2011-01 Introduction As decided by CEN/TC 195, this European Standard is based on particle counting methods which actually cover most needs of d

30、ifferent applications. The difference between this European Standard and previous national standards lies in the technique used for the determination of the integral efficiency. Instead of mass relationships, this technique is based on particle counting at the most penetrating particle size (MPPS),

31、which is for micro-glass filter mediums usually in the range of 0,12 m to 0,25 m. 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. For Membrane and synthetic filter media, separate rules

32、apply; see Annexes A and B of EN 1822-5:2009. 5EN 1822-4:2009 (E) DIN EN 1822-4:2011-01 1 Scope This European Standard applies to efficient air filters (EPA), high efficiency air filters (HEPA) and ultra low penetration air filters (ULPA-filters) used in the field of ventilation and air conditioning

33、 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 a particle counting method using an artificial test aerosol, and allows a standardized classification of these f

34、ilters in terms of their efficiency. This part of EN 1822 applies to the leak testing of filter elements. The scan method which is described in detail regarding procedure, apparatus and test conditions in the body of this standard is valid for the complete range of group H and U filters and is consi

35、dered to be the reference test method for leak determination. The “Oil Thread Leak Test” according to Annex A and the “0,3 m - 0,5 m Particle Efficiency Leak Test” according to Annex E may be used alternatively but for defined classes of group H filters only. 2 Normative references The following ref

36、erenced 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 (including any amendments) applies. EN 1822-1:2009, High efficiency air filters (EPA, HEPA and ULPA) P

37、art 1: Classification, performance testing, marking EN 1822-2, High efficiency air filters (EPA, HEPA and ULPA) Part 2: Aerosol production, measuring equipment, particle counting statistics EN 1822-3, High efficiency air filters (EPA, HEPA and ULPA) Part 3: Testing flat sheet filter media EN 1822-5:

38、2009, High efficiency air filters (EPA, HEPA and ULPA) Part 5: Determining the efficiency of filter elements 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 and the following a

39、pply. 3.1 total particle count method particle counting method in which the total number of particles in a certain sample volume is determined without classification according to size (e.g. by using a condensation nucleus counter) 3.2 particle counting and sizing method particle counting method whic

40、h allows both the determination of the number of particles and also the classification of the particles according to size (e.g. by using an optical particle counter) 3.3 particle flow rate number of particles which are measured or which flow past a specified cross section in unit time 6EN 1822-4:200

41、9 (E) DIN EN 1822-4:2011-01 3.4 particle flow distribution distribution of the particle flow over a plane at right angles to the direction of flow 4 Description of the procedure The leakage test serves to test the filter element for local penetration values which exceed permissible levels (see EN 18

42、22-1). For leakage testing the test filter is installed in the mounting assembly and subjected to a test air flow corresponding to the nominal air flow rate. After measuring the pressure drop at the nominal volume flow rate, the filter is purged and the test aerosol produced by the aerosol generator

43、 is mixed with the prepared test air along a mixing duct so that it is spread homogeneously over the cross-section of the duct. The particle flow rate on the downstream side of the test filter is smaller than the particle flow rate reaching the filter on the upstream side by the factor mean penetrat

44、ion. The manufacturing irregularities of the filter material or leaks lead to a variation of the particle flow rate over the filter face area. In addition, leaks at the boundary areas and within the components of the test filter (sealant, filter frame, seal of the filter mounting assembly) can lead

45、locally to an increase in the particle flow rate on the downstream side of the test filter. For the leakage test, the particle flow distribution shall be determined on the downstream side of the filter in order to check where the limit values are exceeded. The coordinates of these positions shall be

46、 recorded. The scanning tracks shall also cover the area of the filter frame, the corners, the sealant between filter frame and the gasket so that possible leaks in these areas can also be detected. It is advisable to scan filters for leaks with their original gasket mounted and in the same mounting

47、 position and air flow direction as they are installed on site. In order to measure the downstream particle flow distribution, a probe with defined geometry shall be used on the downstream side to take a specified partial flow as sample. From this partial flow, a sample volume flow rate shall be led

48、 to a particle counter which counts the particles and displays the results as a function of time. During the testing, the probe moves at a defined speed in touching or overlapping tracks without gaps (see B.4.2 and B.4.3) close to the downstream side of the filter element. The measuring period for the downstream particle flow distribution can be shortened by using several measuring systems (partial flow extractors/particle counters) operating in parallel. The measurement of the coordinates of the probe, a defined probe speed, and measurem