High-efficiency filters and filter media for removing particles in air - Part 5: Test method for filter elements (ISO 29463-5:2011)

ISO 29463-5:2011 specifies the reference test procedure for determining the efficiency of filters at their most penetrating particle size (MPPS). ISO 29463-5:2011 also gives guidelines for the testing and classification for filters with an MPPS of less than 0,1 μm and filters using media with (charged) synthetic fibres. ISO 29463-5:2011 is intended for use in conjunction with ISO 29463-1, ISO 29463-2, ISO 29463-3 and ISO 29463-4.

Schwebstofffilter und Filtermedien zur Abscheidung von Partikeln aus der Luft - Teil 5: Prüfverfahren für Filterelemente (ISO 29463-5:2011)

Dieser Teil der ISO 29463 spezifiziert das Referenz-Prüfverfahren für die Bestimmung des Abscheidegrads von Filtern für die Partikelgröße im Abscheidegradminimum (MPPS). Er enthält außerdem Richtlinien für die Prüfung und Klassifizierung von Filtern mit einer Partikelgröße im Abscheidegradminimum (MPPS) von weniger als 0,1 μm (Anhang B) und Filtern, die Medien mit (geladenen) synthetischen Fasern (Anhang C) nutzen. Er sollte in Verbindung mit ISO 29463 1, ISO 29463 2, ISO 29463 3 und ISO 29463 4 verwendet werden.

Filtres à haut rendement et filtres pour l'élimination des particules dans l'air - Partie 5: Méthode d'essai des éléments filtrants (ISO 29463-5:2011)

La présente partie de l'ISO 29463 spécifie le mode opératoire d'essai de référence pour la détermination de l'efficacité des filtres pour la taille de particule ayant la plus forte pénétration (MPPS). Elle donne également des lignes directrices pour les essais et la classification des filtres avec une MPPS de moins de 0,1 µm (Annexe B) et des filtres utilisant des médias avec des fibres synthétiques (chargées) (Annexe C). Elle est destinée à être utilisée conjointement avec l'ISO 29463‑1, l'ISO 29463‑2, l'ISO 29463‑3 et l'ISO 29463‑4.

Zelo učinkoviti filtri in filtrirno sredstvo za odstranjevanje delcev iz zraka - 5. del: Metoda preskušanja filtrskih elementov (ISO 29463-5:2011)

ISO 29463-5:2011 določa referenčni preskusni postopek za ugotavljanje učinkovitosti filtrov pri velikosti delcev, ki omogoča največjo prepustnost (MPPS). ISO 29463-5:2011 podaja tudi smernice za preskušanje in klasifikacijo filtrov z vrednostjo MPPS manj kot 0,1 μm ter filtrov s sredstvom iz (naelektrenih) sintetičnih vlaken. ISO 29463-5:2011 je predviden za uporabo v povezavi s standardi ISO 29463-1, ISO 29463-2, ISO 29463-3 in ISO 29463-4.

General Information

Status
Published
Publication Date
09-Oct-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
10-Oct-2018
Completion Date
10-Oct-2018

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SLOVENSKI STANDARD
SIST EN ISO 29463-5:2018
01-december-2018
1DGRPHãþD
SIST EN 1822-5:2010

=HORXþLQNRYLWLILOWULLQILOWULUQRVUHGVWYR]DRGVWUDQMHYDQMHGHOFHYL]]UDNDGHO

0HWRGDSUHVNXãDQMDILOWUVNLKHOHPHQWRY ,62

High-efficiency filters and filter media for removing particles in air - Part 5: Test method

for filter elements (ISO 29463-5:2011)

Schwebstofffilter und Filtermedien zur Abscheidung von Partikeln aus der Luft - Teil 5:

Prüfverfahren für Filterelemente (ISO 29463-5:2011)

Filtres à haut rendement et filtres pour l'élimination des particules dans l'air - Partie 5:

Méthode d'essai des éléments filtrants (ISO 29463-5:2011)
Ta slovenski standard je istoveten z: EN ISO 29463-5:2018
ICS:
13.040.99 Drugi standardi v zvezi s Other standards related to air
kakovostjo zraka quality
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning systems
SIST EN ISO 29463-5:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 29463-5:2018
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SIST EN ISO 29463-5:2018
EN ISO 29463-5
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2018
EUROPÄISCHE NORM
ICS 91.140.30 Supersedes EN 1822-5:2009
English Version
High-efficiency filters and filter media for removing
particles in air - Part 5: Test method for filter elements
(ISO 29463-5:2011)

Filtres à haut rendement et filtres pour l'élimination Schwebstofffilter und Filtermedien zur Abscheidung

des particules dans l'air - Partie 5: Méthode d'essai des von Partikeln aus der Luft - Teil 5: Prüfverfahren für

éléments filtrants (ISO 29463-5:2011) Filterelemente (ISO 29463-5:2011)
This European Standard was approved by CEN on 6 May 2018.

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-CENELEC 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-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 29463-5:2018 E

worldwide for CEN national Members.
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SIST EN ISO 29463-5:2018
EN ISO 29463-5:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 29463-5:2018
EN ISO 29463-5:2018 (E)
European foreword

The text of ISO 29463-5:2011 has been prepared by Technical Committee ISO/TC 142 "Cleaning

equipment for air and other gases” of the International Organization for Standardization (ISO) and has

been taken over as EN ISO 29463-5:2018 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 April 2019, and conflicting national standards shall be

withdrawn at the latest by April 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 1822-5:2009.

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,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 29463-5:2011 has been approved by CEN as EN ISO 29463-5:2018 without any

modification.
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SIST EN ISO 29463-5:2018
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SIST EN ISO 29463-5:2018
INTERNATIONAL ISO
STANDARD 29463-5
First edition
2011-10-15
High-efficiency filters and filter media for
removing particles in air —
Part 5:
Test method for filter elements
Filtres à haut rendement et filtres pour l'élimination des particules dans
l'air —
Partie 5: Méthode d'essai des éléments filtrants
Reference number
ISO 29463-5:2011(E)
ISO 2011
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SIST EN ISO 29463-5:2018
ISO 29463-5:2011(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, without permission in writing from either ISO at the address below or

ISO's 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 copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2011 – All rights reserved
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SIST EN ISO 29463-5:2018
ISO 29463-5:2011(E)
Contents Page

Foreword ............................................................................................................................................................ iv

Introduction ......................................................................................................................................................... v

1  Scope ...................................................................................................................................................... 1

2  Normative references ............................................................................................................................ 1

3  Terms and definitions ........................................................................................................................... 2

4  Description of the method .................................................................................................................... 2

4.1  Alternate efficiency test method for groups H and U filters ............................................................. 3

4.2  Statistical efficiency test method for low efficiency filters — Group E filters ................................ 3

5  Test filter ................................................................................................................................................ 3

6  Test apparatus ....................................................................................................................................... 4

6.1  Test duct ................................................................................................................................................. 4

6.2  Aerosol generation and measuring instruments ............................................................................... 6

7  Conditions of the test air .................................................................................................................... 10

8  Test procedure ..................................................................................................................................... 11

8.1  Preparatory checks ............................................................................................................................. 11

8.2  Starting up the aerosol generator ...................................................................................................... 11

8.3  Preparation of the test filter ............................................................................................................... 11

8.4  Testing .................................................................................................................................................. 11

9  Evaluation ............................................................................................................................................ 12

10  Test report ............................................................................................................................................ 13

11  Maintenance and inspection of the test apparatus .......................................................................... 15

Annex A (normative) Alternate efficiency test method from scan testing .................................................. 16

Annex B (informative) Testing and classification method for filters with MPPS 0,1 µm

(e.g. membrane medium filters) ......................................................................................................... 17

Annex C (normative) Testing and classification of filters using media with (charged) synthetic

fibres ..................................................................................................................................................... 20

Annex D (informative) Traditional efficiency test methods for HEPA and ULPA filters ............................ 22

Bibliography ...................................................................................................................................................... 23

© ISO 2011 – All rights reserved iii
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SIST EN ISO 29463-5:2018
ISO 29463-5:2011(E)
Foreword

ISO (the International Organization 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 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.

International 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. Publication 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 rights.

ISO 29463-5 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 marking
 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
iv © ISO 2011 – All rights reserved
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SIST EN ISO 29463-5:2018
ISO 29463-5:2011(E)
Introduction

ISO 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 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, 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 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 is, for micro-glass filter mediums, usually in the range of 0,12 μm to 0,25 μm. This

method also allows testing 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 are

described in Annex B. Although no equivalent test procedures for testing filters with charged media is

prescribed, a method for dealing with these types of filters is described in Annex C. Specific requirements for

testing method, frequency, and reporting requirements can be modified by agreement between supplier and

customer. For lower-efficiency filters (group H, as 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 noted in ISO 29463-4:2011, Annex A.

There are differences 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 Annex D of this

part of ISO 29463.
© ISO 2011 – All rights reserved v
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SIST EN ISO 29463-5:2018
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SIST EN ISO 29463-5:2018
INTERNATIONAL STANDARD ISO 29463-5:2011(E)
High-efficiency filters and filter media for removing particles in
air —
Part 5:
Test method for filter elements
1 Scope

This part of ISO 29463 specifies the reference test procedure for determining the efficiency of filters at their

most penetrating particle size (MPPS). It also gives guidelines for the testing and classification for filters with

an MPPS of less than 0,1 μm (Annex B) and filters using media with (charged) synthetic fibres (Annex C). It is

intended for use in conjunction with ISO 29463-1, ISO 29463-2, ISO 29463-3 and ISO 29463-4.

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.

ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-

section conduits running full — Part 1: General principles and requirements

ISO/TS 21220:2009, Particulate air filters for general ventilation — Determination of filtration performance

ISO 21501-4, Determination of particle size distribution — Single particle light interaction methods — Part 4:

Light scattering airborne particle counter for clean spaces

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 particles in air — Part 2: Aerosol

production, measuring equipment, particle-counting statistics

ISO 29463-3, High-efficiency filters and filter media for removing particles in air — Part 3: Testing flat sheet

filter media

ISO 29463-4:2011, High-efficiency filters and filter media for removing particles in air — Part 4: Test method

for determining the leakage of filter elements — Scan method
ISO 29464 , Cleaning equipment for air and other gases — Terminology
1) To be published.
© ISO 2011 – All rights reserved 1
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SIST EN ISO 29463-5:2018
ISO 29463-5:2011(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 29463-1, ISO 29463-2, ISO 29463-3,

ISO 29463-4, ISO 29464 and the following apply.
3.1
sampling duration

time during which the particles in the sampling volume flow are counted (upstream or downstream)

3.2
measuring procedure with fixed sampling probes

determination of the overall efficiency using fixed sampling probes upstream and downstream of the test filter

3.3
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
EXAMPLE By using a condensation particle counter.
3.4
particle counting and sizing method

particle counting method which allows both the determination of the number of particles and also the

classification of the particles according to size
EXAMPLE By using an optical particle counter.
3.5
particle concentration method

method that can determine the total concentration of particles in the aerosol either by multiple particle

counting or chemical concentrations
NOTE No particle size classification can be determined by this method.
4 Description of the method

In order to determine the efficiency of the test filter, it is fixed in the test filter mounting assembly and

subjected to a test air volume flow corresponding to the nominal volume flow rate. After measuring the

pressure drop at the nominal volume flow rate, the filter is purged with clean air and the test aerosol produced

by the aerosol generator is mixed with the prepared test air along a mixing section, so that it is spread

homogeneously over the cross-section of the duct.

The efficiency is always determined for the MPPS; see ISO 29463-3. The size distribution of the aerosol

particles can optionally be measured using a particle size analysis system, for example, a differential mobility

particle sizer, DMPS.

The testing can be carried out using either a mono-disperse or poly-disperse test aerosol. When testing with

(quasi-) mono-disperse aerosol, the total particle counting method may be used with a condensation particle

counter (CPC) or an optical particle counter (OPC; for example a laser particle counter). It shall be ensured

that the number median particle diameter corresponds to the MPPS, i.e. the particle diameter at which the

filter medium has its minimum efficiency.
2 © ISO 2011 – All rights reserved
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SIST EN ISO 29463-5:2018
ISO 29463-5:2011(E)

When using a poly-disperse aerosol, the particle counting method, e.g. an optical particle counter or DMPS,

shall be used, which, in addition to counting the particles, is also able to determine their size distribution. It shall

be ensured that the count median diameter, D , of the test aerosol lies in the range given by Equation (1):

MPPS
DS1,5 (1)
M MPPS
where S is the most penetrating particle size.
MPPS

In order to determine the overall efficiency, representative partial flows are extracted on the upstream and

downstream sides of the filter element and directed to the attached particle counter via a fixed sampling probe

to measure the number of particles. It is necessary to have a mixing section behind the test filter to mix the

aerosol homogeneously with the test air over the duct cross-section (see 6.1.4).
4.1 Alternate efficiency test method for groups H and U filters

The standard efficiency test method, as described above, uses downstream mixing and a fixed downstream

probe. However, an alternate efficiency test method using scan test equipment with moving probe(s) is

provided and described in Annex A.

4.2 Statistical efficiency test method for low efficiency filters — Group E filters

For filters of group E, the overall efficiency shall be determined by one of the statistical test procedures

described below and it is not necessary to carry out the test for each single filter element (as is mandatory for

filters of groups H and U). The overall efficiency of group E filters shall be determined by averaging the results

of the statistical leak test as described below.

A record of the filter data in the form of a type test certificate or alternatively a factory test certificate is

required. However, the supplier shall be able to provide documentary evidence to verify the published filter

data upon request. This can be done by either:

a) maintaining a certified quality management system (e.g. ISO 9000), which requires the application of

statistically based methods for testing and documenting efficiency for group E filters in accordance with

this part of ISO 29463; or
b) using accepted statistical methods to test all of production lots of filters.

The skip lot procedure as described in ISO 2859-1 or any equivalent alternative method may be used.

The skip lot procedure as described in ISO 2859-1 implies that at the beginning, the test frequency is high

and is, in the course of further testing, reduced as the production experience grows and the products

produced conform to the target. For example, for the first eight production lots, 100 % of the produced

filters are tested. If all the tests are positive, the frequency is reduced to half for the next eight production

lots. If all the tests are positive again, the number is reduced by half again, and so on until it is necessary

to test only one out of eight lots (e.g. the minimum test frequency). Each time one of the tested filters fails,

the test frequency is doubled again. In any case, the number of samples per lot tested shall be greater

than three filters.
5 Test filter

The filter element being tested shall show no signs of damage or any other irregularities. The filter element

shall be handled carefully and shall be clearly and permanently marked with the following details:

 designation of the filter element;
 upstream side of the filter element.

The temperature of the test filter during the testing shall correspond with that of the test air.

© ISO 2011 – All rights reserved 3
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SIST EN ISO 29463-5:2018
ISO 29463-5:2011(E)
6 Test apparatus

A flow sheet showing the arrangement of apparatus comprising a test rig is given in ISO 29463-1:2011,

Figure 4. An outline diagram of a test rig is given in Figure 1.

The fundamentals of aerosol generation and neutralization with details of suitable types of equipment as well

as detailed descriptions of the measuring instruments required for the testing are given in ISO 29463-2.

Key
1 coarse dust filter
2 fine dust filter
3 fan
4 air heating
5 high-efficiency air filter
6 aerosol inlet to the test duct
7 temperature measurement
8 hygrometer
9 sampler, particle size analysis
10 sampler, upstream
11 ring pipe for differential pressure measurement
12 manometer
13 test filter mounting assembly
14 measuring damper (see ISO 5167-1)
15 measurement of absolute pressure
16 manometer measuring differential pressure
17 sampler, downstream
Figure 1 — Example of a test rig
6.1 Test duct
6.1.1 Test air conditioning

The test air conditioning equipment shall be comprised of the equipment required to control the condition of

the test air so that it can be brought in compliance with the requirement of Clause 7.

4 © ISO 2011 – All rights reserved
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SIST EN ISO 29463-5:2018
ISO 29463-5:2011(E)
6.1.2 Adjustment of the volume flow rate

Filters shall always be tested at their nominal air flow rate. It shall be possible to adjust the volume flow rate by

means of a suitable provision (e.g. by changing the speed of the fan, or with dampers) to a value 5 % of the

nominal flow rate, which shall then remain constant within 2 % throughout each test.

6.1.3 Measurement of the volume flow rate

The volume flow rate shall be measured using a standardized or calibrated method (e.g. measurement of the

differential pressure using standardized damper equipment, such as orifice plates, nozzles, Venturi tubes in

accordance with ISO 5167-1.
The limit error of measurement shall not exceed 5 % of the measured value.
6.1.4 Aerosol mixing section

The aerosol input and the mixing section (see Figure 1 for an example) shall be so constructed that the

aerosol concentration measured at individual points of the duct cross-section, directly in front of the test filter,

do not deviate by more than 10 % from the mean value of at least nine measuring points over the channel

cross-section.
6.1.5 Test filter mounting assembly

The test filter mounting assembly shall ensure that the test filter can be sealed and subjected to flow in

accordance with requirements.
It shall not obstruct any part of the filter cross-sectional area.
6.1.6 Measuring points for the pressure drop

The measuring points for pressure drop shall be so arranged that the mean value of the static pressure in the

flow upstream and downstream of the filter can be measured. The planes of the pressure measurements

upstream and downstream shall be positioned in regions of an even flow with a uniform flow profile.

In rectangular or square test ducts, smooth holes with a diameter of 1 mm to 2 mm for the pressure

measurements shall be bored in the middle of the channel walls, normal to the direction of flow. The four holes

shall be interconnected with a circular pipe.
6.1.7 Sampling

In order to determine the efficiency, partial flows are extracted from the test volume flow by sampling probes

and led to the particle counters. The diameter of the probes shall be chosen so that isokinetic conditions are

maintained in the duct at the given volume flow rate for the sample. In this way, sampling errors can be

neglected due to the small size of the particles in the test aerosol. The connections to the particle counter

shall be as short as possible. Samples on the upstream side are taken by a fixed sampling probe in front of

the test filter. The sampling shall be representative, on the basis that the aerosol concentration measured from

the sample does not deviate by more than 10 % from the mean value determined in accordance with 6.1.4.

A fixed sampling probe is also installed downstream, preceded by a mixing section that ensures a

representative measurement of the downstream aerosol concentration. This is taken to be the case when, in

event of an artificially made big leak in the test filter, the aerosol concentration measured downstream the filter

does not at any point deviate by more than 10% from the mean value of at least nine measuring points over

the duct cross-section. It is necessary, however, to verify beforehand that the artificially made leak is big

enough to increase the filter penetration by at least a factor of five relative to the penetration of the non-

leaking filter.

The mean aerosol concentrations determined at the upstream and downstream sampling points without the

filter in position shall not differ from each other by more than 5 %.
© ISO 2011 – All rights reserved 5
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SIST EN ISO 29463-5:2018
ISO 29463-5:2011(E)
6.2 Aerosol generation and measuring instruments

The operating parameters of the aerosol generator shall be adjusted to produce a test aerosol whose number

median diameter is in the range of the MPPS for the sheet filter medium.

The median size of the mono-disperse test aerosol shall not deviate from the MPPS by more than 10 %. A

deviation of 50 % is allowed when using a poly-disperse aerosol.

The particle output of the aerosol generator shall be adjusted according to the test volume flow rate and the

filter efficiency, so that the counting rates on the upstream and downstream sides lie under the coincidence

limits of the counter (maximum coincidence error of 10 % in accordance with ISO 21501-4), and significantly

above the zero count rate of the instruments.

The number distribution concentration of the test aerosol can be determined using a suitable particle size

analysis system (e.g. a differential mobility particle sizer, DMPS) or with a laser particle counter suitable for

these test purposes. The limit error of the measureme
...

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