High efficiency air filters (EPA, HEPA and ULPA) - Part 3: Testing flat sheet filter media

This European Standard applies to high efficiency particulate air filters 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 clean room technology or applications in
the nuclear and pharmaceutical industry. It establishes a procedure for the determination of the efficiency on the basis of 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 conditions for carrying out the test, and the basis for calculating results.

Schwebstofffilter (EPA, HEPA und ULPA) - Teil 3: Prüfung des planen Filtermediums

Diese Europäische Norm gilt für Hochleistungs-Partikelfilter (EPA) Schwebstofffilter (HEPA) und
Hochleistungs-Schwebstofffilter (ULPA) im Bereich der Raum- und Prozesslufttechnik, z. B. Anwendungen in
der Reinraumtechnik oder in der pharmazeutischen Industrie.
Sie legt ein Verfahren zur Prüfung des Abscheidegrades auf Basis von Partikelzählverfahren unter Verwendung
eines flüssigen Prüfaerosols fest und ermöglicht eine einheitliche Klassifizierung der Schwebstofffilter
nach dem Abscheidegrad, sowohl nach dem integralen als auch nach dem lokalen Abscheidegrad.
Diese Europäische Norm gilt für die Prüfung von planen Filtermedien, die in Schwebstofffiltern eingesetzt
werden. Prüfverfahren, Prüfeinrichtungen, Prüfbedingungen und Berechnungsgrundlagen sind im Einzelnen
beschrieben.

Filtres à air à haute efficacité (EPA, HEPA et ULPA) - Partie 3: Essais de medias filtrants plans

La présente Norme européenne s'applique aux filtres à air à haute efficacité et aux filtres à air à très faible pénétration (EPA, HEPA et ULPA) utilisés dans le domaine de la ventilation et de la climatisation, ainsi que dans des procédés techniques, tels que les applications en salle blanche ou l'industrie pharmaceutique.
Elle définit une méthode de détermination de l'efficacité, à partir d'une méthode du comptage de particules à l'aide d'un aérosol d'essai liquide et permet une classification normalisée de ces filtres en fonction de leur efficacité.
La présente Norme européenne s'applique aux essais de media filtrants plans utilisés dans les filtres à air à très haute efficacité. Elle comporte les méthodes, circuits d'essai et conditions permettant la bonne réalisation de l'essai et fournit la base de calcul des résultats.

Visoko učinkoviti zračni filtri (EPA, HEPA in ULPA) - 3. del: Preskušanje ravnih filtrskih medijev

Ta evropski standard velja za visoko učinkovite zračne filtre drobnih delcev in zračne filtre z ultra nizko penetracijo (EPA, HEPA in ULPA), ki se uporabljajo na področju prezračevanja in klimatizacije ter za tehnične postopke, npr. za naprave v tehnologiji čistega prostora ali farmacevtski industriji. Vzpostavlja postopek za določitev učinkovitosti na osnovi metode štetja delcev z uporabo tekočega testnega aerosola ter omogoča standardizirano klasifikacijo teh filtrov glede na njihovo učinkovitost. Ta evropski standard velja za preskušanje ravnih filtrskih medijev, ki se uporabljajo v visoko učinkovitih zračnih filtrih. Postopek vključuje metode, namestitev elementov pri preskusu in pogoje za izvajanje preskusa ter osnovo za izračun rezultatov.

General Information

Status
Withdrawn
Public Enquiry End Date
30-Jun-2008
Publication Date
15-Dec-2009
Withdrawal Date
22-Oct-2018
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
18-Oct-2018
Due Date
10-Nov-2018
Completion Date
23-Oct-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Schwebstofffilter (EPA, HEPA und ULPA) - Teil 3: Prüfung des planen FiltermediumsFiltres à air à haute efficacité (EPA, HEPA et ULPA) - Partie 3: Essais de medias filtrants plansHigh efficiency air filters (EPA, HEPA and ULPA) - Part 3: Testing flat sheet filter media23.120QDSUDYHVentilators. Fans. Air-conditionersICS:Ta slovenski standard je istoveten z:EN 1822-3:2009SIST EN 1822-3:2010en01-januar-2010SIST EN 1822-3:2010SLOVENSKI
STANDARDSIST EN 1822-3:20001DGRPHãþD



SIST EN 1822-3:2010



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1822-3
November 2009 ICS 13.040.40 Supersedes EN 1822-3:1998English Version
High efficiency air filters (EPA, HEPA and ULPA) - Part 3: Testing flat sheet filter media
Filtres à air à haute efficacité (EPA, HEPA et ULPA) - Partie 3: Essais de medias filtrants plans
Schwebstofffilter (EPA, HEPA und ULPA) - Teil 3: Prüfung des planen Filtermediums This European Standard was approved by CEN 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 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 the 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, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1822-3:2009: ESIST EN 1822-3:2010



EN 1822-3:2009 (E) 2 Contents Page Foreword .3Introduction .41Scope .52Normative references .53Terms and definitions .54Symbols and abbreviations .55Description of the test method .76Sampling of sheet filter media .77Test apparatus .77.1General .77.2Test arrangements for testing with monodisperse test aerosol .77.3Test arrangements for testing with a polydisperse test aerosol . 107.4Test filter mounting assembly . 127.4.1General . 127.4.2Measurement of differential pressure . 137.4.3Sampling . 137.5Determination of the filter medium face velocity . 148Requirements for the test air . 149Testing procedure. 149.1Preparatory checks . 149.2Procedure . 159.2.1General . 159.2.2Measurement of the pressure drop . 159.2.3Testing with a monodisperse test aerosol . 159.2.4Testing with a polydisperse test aerosol . 159.3Reference test method . 1510Evaluation . 1611Test report . 1612Maintenance and inspection of the test apparatus . 17Annex A (informative)
Example of an application with evaluation . 18A.1Testing the sheet filter medium . 18A.1.1General . 18A.1.2Measurement of the differential pressure . 18A.1.3Particle counting . 18A.2Calculation of the arithmetic means . 19A.2.1General . 19A.2.2Mean differential pressure . 19A.2.3Mean efficiency E . 19A.2.4Mean efficiencies E95% as lower limit values for the 95 % confidence interval . 20A.3Representation of the efficiency curve . 21Bibliography . 23 SIST EN 1822-3:2010



EN 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 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. CEN [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 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 media  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 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 µm to 0,25 µm). It also allows ultra low penetration 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, Belgium, 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.
SIST EN 1822-3:2010



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 determination 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 µm to 0,25 µm. For Membrane filter media, separate rules apply, see Annex A 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. SIST EN 1822-3:2010



EN 1822-3:2009 (E) 5 1 Scope This European Standard applies to high efficiency particulate air filters 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 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 conditions 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 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 statistics 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 measurement variables and calculated values. The values inserted in the equation given for these calculations should be in the units specified. SIST EN 1822-3:2010



EN 1822-3:2009 (E) 6 Table 1 — Quantities Term Symbol Unit Equation for the calculation Measured variables Exposed area A cm²
Test volume flow rate V& cm³/s
Pressure drop ∆p Pa
Mean particle diameter p~d µm
Particle number N -
Sampling volume flow rate s&V cm³/s
Sampling duration t s
Calculated quantities Filter medium face velocity u cm/s AVu&= Mean differential pressure
∆p Pa p∆= 1n ∑=∆niip1 Particle number concentration cN cm-³ tVNcN⋅=S& Penetration for particles in size range i Pi a iuNidNiccP,,,,=
b Mean penetration P a ∑==niiPnP11 Mean efficiency E a PE−=1 Number of particles for the upper or lower limit of the 95 % level of confidence N95% - See Clause 7 of EN 1822-2:2009 Penetration as upper limit value for the 95 % level of confidence P95%, i a iuNidNiccP%,95,,%,95,,%,95= b Mean penetration as upper limit value for the 95 % level of confidence %95P a ∑==niiPnP1%,95%951 Mean efficiency as lower limit value for the 95 % level of confidence %95E a %95%951PE−= a These quantities are usually given as a percentage. b The index "u" refers to up-stream particle counts, and the index "d" refers to down-stream particle counts. SIST EN 1822-3:2010



EN 1822-3:2009 (E) 7 5 Description of the test method When testing the sheet filter medium the fractional efficiency is determined using a particle counting method. The testing can use a monodisperse or a polydisperse test aerosol. The methods differ in terms of both the production of the 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 velocity. The test aerosol from the aerosol generator shall be conditioned (e.g. vaporisation of a solvent) then neutralised, mixed homogeneously with filtered test air and led to the test filter assembly. In order to determine the efficiency, partial flows of the test aerosol are sampled upstream and downstream 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 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 may be necessary to use a dilution system in order to reduce the concentration of particles down to 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 shall be carried out on at least five samples. The samples shall be handled with care; the 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 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 arrangements 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 monodisperse 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 SIST EN 1822-3:2010



EN 1822-3:2009 (E) 8 convenient size for the following process by evaporation of 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 test 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 test range from 0,04 µm to
0,8 µm 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 concentration 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 operate 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 the 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 included 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. SIST EN 1822-3:2010



EN 1822-3:2009 (E) 9
Key 1 Filter 2 Pressure valve 3 Solenoid valve 4 Jet nebuliser 5 Neutraliser 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 control and data storage Figure 1 — Setup for testing with monodisperse test aerosols SIST EN 1822-3:2010



EN 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 determine 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 substance in the solvent. The mean particle diameter of the number distribution shall not lie outside the test range of 0,04 µm to 0,8 µm. 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 to 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
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