SIST EN 149:2001+A1:2009

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SLOVENSKI STANDARD
01-julij-2009
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SUHVNXãDQMHR]QDþHYDQMH
Respiratory protective devices - Filtering half masks to protect against particles -
Requirements, testing, marking
Atemschutzgeräte - Filtrierende Halbmasken zum Schutz gegen Partikeln -
Anforderungen, Prüfung, Kennzeichnung
Appareils de protection respiratoire - Demi-masques filtrants contre les particules -
Exigences, essais, marquage
Ta slovenski standard je istoveten z: EN 149:2001+A1:2009
ICS:
13.340.30 Varovalne dihalne naprave Respiratory protective
devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN 149:2001+A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2009
ICS 13.340.30 Supersedes EN 149:2001
English Version
Respiratory protective devices - Filtering half masks to protect
against particles - Requirements, testing, marking
Appareils de protection respiratoire - Demi-masques Atemschutzgeräte - Filtrierende Halbmasken zum Schutz
filtrants contre les particules - Exigences, essais, marquage gegen Partikeln - Anforderungen, Prüfung, Kennzeichnung
This European Standard was approved by CEN on 8 March 2001 and includes Corrigendum 1 issued by CEN on 24 July 2002 and
Amendment 1 approved by CEN on 26 March 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 Ref. No. EN 149:2001+A1:2009: E
worldwide for CEN national Members.

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EN 149:2001+A1:2009 (E)
Contents
Page
Foreword . 4
Introduction . 4
1 Scope . 4
2 Normative references. 5
3 Terms and definitions . 5
4 Description . 5
5 Classification . 5
6 Designation . 6
7 Requirements . 6
7.1 General . 6
7.2 Nominal values and tolerances . 6
7.3 Visual inspection . 6
7.4 Packaging . 6
7.5 Material . 6
7.6 Cleaning and disinfecting . 6
7.7 Practical performance . 7
7.8 Finish of parts. 7
7.9 Leakage . 7
7.10 Compatibility with skin . 8
7.11 Flammability . 8
7.12 Carbon dioxide content of the inhalation air . 9
7.13 Head harness . 9
7.14 Field of vision . 9
7.15 Exhalation valve(s) . 9
7.16 Breathing resistance . 9
7.17 Clogging . 10
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7.18 Demountable parts . 11
8 Testing . 11
8.1 General . 11
8.2 Visual inspection . 11
8.3 Conditioning . 11
8.4 Practical performance . 12
8.5 Leakage . 13
8.6 Flammability . 16
8.7 Carbon dioxide content of the inhalation air . 17
8.8 Strength of attachment of exhalation valve housing . 18
8.9 Breathing Resistance . 18
8.10 Clogging . 19
8.11 !!!!Penetration of filter material . 20
9 Marking . 21
9.1 Packaging . 21
9.2 Particle filtering half mask . 21
10 Information to be supplied by the manufacturer . 22
Annex A (informative) Marking . 38
Annex ZA . (informative) Clauses of this European Standard addressing essential requirements or other
provisions of EU Directives . 39
Bibliography . 41
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EN 149:2001+A1:2009 (E)
Foreword
This document (EN 149:2001+A1:2009) has been prepared by Technical Committee CEN/TC 79
"Respiratory protective devices", the secretariat of which is held by DIN.
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 November 2009, and conflicting national standards
shall be withdrawn at the latest by November 2009.
This European Standard supersedes !EN 149:2001".
This European Standard was approved by CEN on 8 March 2001 and includes Corrigendum 1 issued by
CEN on 24 July 2002 and Amendment 1 approved by CEN on 26 March 2009.
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
The modifications of the related CEN Corrigendum have been implemented at the appropriate places in
the text and are indicated by the tags ˜ ™.
This European Standard has been prepared under a mandate given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
standard.
Annex A is informative.
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.

Introduction
A given respiratory protective device can only be approved when the individual components satisfy the
requirements of the test specification which may be a complete standard or part of a standard, and
practical performance tests have been carried out successfully on complete apparatus where specified
in the appropriate standard. If for any reason a complete apparatus is not tested then simulation of the
apparatus is permitted provided the respiratory characteristics and weight distribution are similar to
those of the complete apparatus.
1 Scope
This European Standard specifies minimum requirements for filtering half masks as respiratory
protective devices to protect against particles except for escape purposes.
Laboratory and practical performance tests are included for the assessment of compliance with the
requirements.
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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 132, Respiratory protective devices - Definitions of terms and pictograms
EN 134, Respiratory protective devices - Nomenclature of components
EN 143, Respiratory protective devices - Particle filters - Requirements, testing, marking
!EN 13274-7, Respiratory protective devices – Methods of test – Part 7: Determination of particle filter
penetration"
ISO 6941, Textile fabrics - Burning behaviour - Measurement of flame spread properties of vertically
oriented specimens
3 Terms and definitions
For the purposes of this European Standard the definitions given in EN 132 and the nomenclature given
in EN 134 apply !together with the following:
3.1
re-useable particle filtering half mask
particle filtering half mask intended to be used for more than a single shift"
4 Description
A particle filtering half mask covers the nose and mouth and the chin and may have inhalation and/or
exhalation valve(s). The half mask consists entirely or substantially of filter material or comprises a
facepiece in which the main filter(s) form an inseparable part of the device.
It is intended to provide adequate sealing on the face of the wearer against the ambient atmosphere,
when the skin is dry or moist and when the head is moved.
Air enters the particle filtering half mask and passes directly to the nose and mouth area of the
facepiece or, via an inhalation valve(s) if fitted. The exhaled air flows through the filter material and/or an
exhalation valve (if fitted) directly to the ambient atmosphere.
These devices are designed to protect against both solid and liquid aerosols.
5 Classification
Particle filtering half masks are classified according to their filtering efficiency and their maximum total
inward leakage. There are three classes of devices:
FFP1, FFP2 and FFP3.
The protection provided by an FFP2 - or FFP3 - device includes that provided by the device of lower
class or classes.
!In addition, particle filtering half masks are classified as single shift use only or as re-usable (more
than one shift)."
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6 Designation
Particle filtering half masks meeting the requirements of this European Standard shall be designated in
the following manner:
!Particle filtering half mask EN 149, year of publication, classification, option (where "D" is an option
for a non re-useable particle filtering half mask and mandatory for re-useable particle filtering half
mask)."
!EXAMPLE Particle filtering half mask EN 149:2001 FFP1 NR D "
7 Requirements
7.1 General
In all tests all test samples shall meet the requirements.
7.2 Nominal values and tolerances
Unless otherwise specified, the values stated in this European Standard are expressed as nominal
values. Except for temperature limits, values which are not stated as maxima or minima shall be
subject to a tolerance of ± 5 %. Unless otherwise specified, the ambient temperature for testing shall
be (16 - 32) °C, and the temperature limits shall be subject to an accuracy of ± 1 °C.
7.3 Visual inspection
The visual inspection shall also include the marking and the information supplied by the manufacturer.

7.4 Packaging
Particle filtering half masks shall be offered for sale packaged in such a way that they are protected
against mechanical damage and contamination before use.
Testing shall be done in accordance with 8.2.
7.5 Material
Materials used shall be suitable to withstand handling and wear over the period for which the particle
filtering half mask is designed to be used.
After undergoing the conditioning described in 8.3.1 none of the particle filtering half masks shall have
suffered mechanical failure of the facepiece or straps.
Three particle filtering half masks shall be tested.
When conditioned in accordance with 8.3.1 and 8.3.2 the particle filtering half mask shall not collapse.
Any material from the filter media released by the air flow through the filter shall not constitute a hazard
or nuisance for the wearer.
Testing shall be done in accordance with 8.2.
7.6 Cleaning and disinfecting
!If the particle filtering half mask is designed to be re-usable, the materials used shall withstand the
cleaning and disinfecting agents and procedures to be specified by the manufacturer."
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Testing shall be done in accordance with 8.4 and 8.5.
!With reference to 7.9.2, after cleaning and disinfecting the re-usable particle filtering half mask shall
satisfy the penetration requirement of the relevant class.
Testing shall be done in accordance with 8.11."
7.7 Practical performance
The particle filtering half mask shall undergo practical performance tests under realistic conditions.
These general tests serve the purpose of checking the equipment for imperfections that cannot be
determined by the tests described elsewhere in this standard.
Where practical performance tests show the apparatus has imperfections related to wearer's
acceptance, the test house shall provide full details of those parts of the practical performance tests
which revealed these imperfections.
Testing shall be done in accordance with 8.4.
7.8 Finish of parts
Parts of the device likely to come into contact with the wearer shall have no sharp edges or burrs.
Testing shall be done in accordance with 8.2.
7.9 Leakage
7.9.1 Total inward leakage
The laboratory tests shall indicate that the particle filtering half mask can be used by the wearer to
protect with high probability against the potential hazard to be expected.
The total inward leakage consists of three components: face seal leakage, exhalation valve leakage (if
exhalation valve fitted) and filter penetration.
For particle filtering half masks fitted in accordance with the manufacturer’s information, at least 46 out
of the 50 individual exercise results (i.e. 10 subjects x 5 exercises) for total inward leakage shall be not
greater than
25 % for FFP1
11 % for FFP2
5 % for FFP3
and, in addition, at least 8 out of the 10 individual wearer arithmetic means for the total inward leakage
shall be not greater than
22 % for FFP1
8 % for FFP2
2 % for FFP3.
Testing shall be done in accordance with 8.5.
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7.9.2 Penetration of filter material
The penetration of the filter of the particle filtering half mask shall meet the requirements of Table 1.
Table 1 — Penetration of filter material
Classification !Maximum penetration of test aerosol"
Sodium chloride test 95 l/min Paraffin oil test 95 l/min
% %
max. max.
FFP1 20 20
FFP2 6 6
FFP3 1 1
!A total of 9 samples of particle filtering half masks shall be tested for each aerosol.
Testing in accordance with 8.11 using the Penetration test according to EN 13274-7, shall be performed
on:
- 3 samples as received;
- 3 samples after the simulated wearing treatment described in 8.3.1.
Testing in accordance with 8.11 using the Exposure test with a specified mass of test aerosol of 120 mg,
and for particle filtering devices claimed to be re-usable additionally the Storage test, according to
EN 13274-7, shall be performed:
- for non-re-usable devices on:
- 3 samples after the test for mechanical strength in accordance with 8.3.3 followed by temperature
conditioning in accordance with 8.3.2.
- for re-usable devices on:
- 3 samples after the test for mechanical strength in accordance with 8.3.3 followed by temperature
conditioning in accordance with 8.3.2. and followed by one cleaning and disinfecting cycle according
to the manufacturer's instruction."
7.10 Compatibility with skin
Materials that may come into contact with the wearer’s skin shall not be known to be likely to cause
irritation or any other adverse effect to health.
Testing shall be done in accordance with 8.4 and 8.5.
7.11 Flammability
The material used shall not present a danger for the wearer and shall not be of highly flammable nature.
When tested, the particle filtering half mask shall not burn or not to continue to burn for more than 5 s
after removal from the flame.
The particle filtering half mask does not have to be usable after the test.
Testing shall be done in accordance with 8.6.
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7.12 Carbon dioxide content of the inhalation air
The carbon dioxide content of the inhalation air (dead space) shall not exceed an average of 1,0 % (by
volume).
Testing shall be done in accordance with 8.7.
7.13 Head harness
The head harness shall be designed so that the particle filtering half mask can be donned and removed
easily.
The head harness shall be adjustable or self-adjusting and shall be sufficiently robust to hold the particle
filtering half mask firmly in position and be capable of maintaining total inward leakage requirements for
the device.
Testing shall be done in accordance with 8.4 and 8.5.
7.14 Field of vision
The field of vision is acceptable if determined so in practical performance tests.
Testing shall be done in accordance with 8.4.
7.15 Exhalation valve(s)
A particle filtering half mask may have one or more exhalation valve(s), which shall function correctly in
all orientations.
Testing shall be done in accordance with 8.2 and 8.9.1.
If an exhalation valve is provided it shall be protected against or be resistant to dirt and mechanical
damage and may be shrouded or may include any other device that may be necessary for the particle
filtering half mask to comply with 7.9.
Testing shall be done in accordance with 8.2.
Exhalation valve(s), if fitted, shall continue to operate correctly after a continuous exhalation flow of
300 l/min over a period of 30 s.
Testing shall be done in accordance with 8.3.4.
When the exhalation valve housing is attached to the faceblank, it shall withstand axially a tensile force
of 10 N applied for 10 s.
Testing shall be done in accordance with 8.8.
7.16 Breathing resistance
The breathing resistances apply to valved and valveless particle filtering half masks and shall meet the
requirements of Table 2.
Testing shall be done in accordance with 8.9.

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Table 2 — Breathing resistance
Classification Maximum permitted resistance (mbar)
inhalation exhalation
30 l/min 95 l/min 160 l/min
FFP1 0,6 2,1 3,0
FFP2 0,7 2,4 3,0
FFP3 1,0 3,0 3,0
7.17 Clogging
7.17.1 General
!For single shift use devices, the clogging test is an optional test. For re-usable devices the test is
mandatory."
Devices designed to be resistant to clogging, shown by a slow increase of breathing resistance when
loaded with dust, shall be subjected to the treatment described in 8.10.
The specified breathing resistances shall not be exceeded before the required dust load of 833 mg•h/m
is reached.
7.17.2 Breathing resistance
7.17.2.1 Valved particle filtering half masks
After clogging the inhalation resistances shall not exceed
 FFP1: 4 mbar
 FFP2: 5 mbar
 FFP3: 7 mbar
at 95 l/min continuous flow;
The exhalation resistance shall not exceed 3 mbar at 160 l/min continuous flow.
Testing shall be done in accordance with 8.9.
7.17.2.2 Valveless particle filtering half masks
After clogging the inhalation and exhalation resistances shall not exceed
 FFP1: 3 mbar
 FFP2: 4 mbar
 FFP3: 5 mbar
at 95 l/min continuous flow.
Testing shall be done in accordance with 8.9.
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7.17.3 !!!!Penetration of filter material
All types (valved and valveless) of particle filtering half masks claimed to meet the clogging requirement
shall also meet the requirements given in 7.9.2, for the Penetration test according to EN 13274-7, after
the clogging treatment.
Testing shall be done in accordance with 8.11 using EN 13274-7"
7.18 Demountable parts
All demountable parts (if fitted) shall be readily connected and secured, where possible by hand.
Testing shall be done in accordance with 8.2.
8 Testing
8.1 General
If no special measuring devices and methods are specified, commonly used devices and methods shall
be used.
NOTE For a summary of testing, see Table 4.
Before performing tests involving human subjects account should be taken of any national regulations
concerning the medical history, examination or supervision of the test subjects.
8.2 Visual inspection
The visual inspection is carried out where appropriate by the test house prior to laboratory or practical
performance tests.
8.3 Conditioning
8.3.1 Simulated wearing treatment
Conditioning by simulated wearing treatment shall be carried out by the following process.
A breathing machine is adjusted to 25 cycles/min and 2,0 l/stroke. The particle filtering half mask is
mounted on a Sheffield dummy head. For testing, a saturator is incorporated in the exhalation line
between the breathing machine and the dummy head, the saturator being set at a temperature in
excess of 37 °C to allow for the cooling of the air before it reaches the mouth of the dummy head. The
air shall be saturated at (37 ± 2) °C at the mouth of the dummy head. In order to prevent excess water
spilling out of the dummy’s mouth and contaminating the particle filtering half mask the head shall be
inclined so that the water runs away from the mouth and is collected in a trap.
The breathing machine is brought into operation, the saturator switched on and the apparatus allowed to
stabilize. The particle filtering half mask under test shall then be mounted on the dummy head. During
the test time at approximately 20 min intervals the particle filtering half mask shall be completely
removed from the dummy head and refitted such that during the test period it is fitted ten times to the
dummy head.
8.3.2 Temperature conditioning
Expose the particle filtering half masks to the following thermal cycle:
a) for 24 h to a dry atmosphere of (70 ± 3) °C;
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b) for 24 h to a temperature of (-30 ± 3) °C;
and allow to return to room temperature for at least 4 h between exposures and prior to subsequent
testing.
The conditioning shall be carried out in a manner which ensures that no thermal shock occurs.
8.3.3 Mechanical strength
Conditioning shall be done in accordance with EN 143.
8.3.4 Flow conditioning
A total of 3 valved particle filtering half masks shall be tested, one as received and two temperature conditioned in
accordance with 8.3.2.
8.4 Practical performance
8.4.1 General
A total of 2 particle filtering half masks shall be tested: both as received.
All tests shall be carried out by two test subjects at ambient temperature and the test temperature and
humidity shall be recorded.
Prior to the test there shall be an examination to assure that the particle filtering half mask is in good
working condition and that it can be used without hazard.
Examination shall be done in accordance with 8.2.
For the test, persons shall be selected who are familiar with using such or similar equipment.
During the tests the particle filtering half mask shall be subjectively assessed by the wearer and after the
test, comments on the following shall be recorded:
a) head harness comfort;
b) security of fastenings;
c) field of vision;
d) any other comments reported by the wearer on request.
8.4.2 Walking test
The subjects wearing normal working clothes and wearing the particle filtering half mask shall walk at a
regular rate of 6 km/h on a level course. The test shall be continuous, without removal of the particle
filtering half mask, for a period of 10 min.
8.4.3 Work simulation test
The particle filtering half mask shall be tested under conditions which can be expected during normal
use. During this test the following activities shall be carried out in simulation of the practical use of the
particle filtering half mask. The test shall be completed within a total working time of 20 min.
The sequence of activities is at the discretion of the test house. The individual activities shall be
arranged so that sufficient time is left for the comments prescribed.
a) walking on the level with headroom of (1,3 ± 0,2) m for 5 min;
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b) crawling on the level with headroom of (0,70 ± 0,05) m for 5 min;
c) filling a small basket (see Figure 1, approximate volume = 8 l) with chippings or other suitable
material from a hopper which stands 1,5 m high and has an opening at the bottom to allow the
contents to be shovelled out and a further opening at the top where the basket full of chippings is
returned.
The subject shall stoop or kneel as he wishes and fill the basket with chippings. He shall then lift the
basket and empty the contents back into the hopper. This shall be done 20 times in 10 min.
8.5 Leakage
8.5.1 General test procedure
8.5.1.1 Total inward leakage
A total of 10 test specimens shall be tested: 5 as received and 5 after temperature conditioning in
accordance with 8.3.2.
The total inward leakage shall be tested using sodium chloride aerosol.
Prior to the test there shall be an examination to ensure that the particle filtering half mask is in good
working condition and that it can be used without hazard.
Examination shall be done in accordance with 8.2.
For the test, persons shall be selected who are familiar with using such or similar equipment.
A panel of ten clean-shaven persons (without beards or sideburns) shall be selected covering the
spectrum of facial characteristics of typical users (excluding significant abnormalities). It is to be
expected that exceptionally some persons cannot be satisfactorily fitted with a particle filtering half
mask. Such exceptional subjects shall not be used for testing particle filtering half masks.
In the test report the faces of the ten test subjects shall be described (for information only) by the four
facial dimensions (in mm) illustrated in Figure 2.
8.5.1.2 Test equipment
The test atmosphere shall preferably enter the top of the enclosure through a flow distributor, and be
directed downwards over the head of the test subject at a minimum flow rate of 0,12 m/s. The
concentration of the test agent inside the effective working volume shall be checked to be
homogeneous. The flow rate should be measured close to the subject’s head.
A level treadmill is required capable of working at 6 km/h.
8.5.1.3 Test procedure
Ask the test subjects to read the manufacturer’s fitting information and if more than one size of particle
filtering half mask is manufactured, ask the test subject to select the size deemed by him to be the most
appropriate. If necessary the test supervisor shall show the test subjects how to fit the particle filtering
half mask correctly in accordance with the fitting information.
Inform the test subjects that if they wish to adjust the particle filtering half mask during the test they may
do so. However if this is done, repeat the relevant section of the test, having allowed the system to re-
settle.
The test subjects shall have no indication of the results as the test proceeds.
Posebna objava SIST z dovoljenjem CEN, CENELEC, ISO in IEC: Za potrebe zagotavljanja brezplačnega dostopa do vsebin standardov v času epidemije COVID-19.
Samo za branje. Kopiranje in posredovanje prepovedano. © SIST 2020-04-10
EN 149:2001+A1:2009 (E)
After fitting the particle filtering half mask, ask each test subject ‘Does the mask fit?’. If the answer is
‘Yes’, continue the test. If the answer is ‘No’, take the test subject off the panel, report the fact and
replace with another test subject.
The test sequence shall be as follows:
a) Ensure the test atmosphere is OFF.
b) Place the test subject in the enclosure. Connect up the facepiece sampling probe. Have the test
subject walk at 6 km/h for 2 min. Measure the test agent concentration inside the particle filtering
half mask to establish the background level.
c) Obtain a stable reading.
d) Turn the test atmosphere ON.
e) The subject shall continue to walk for a further 2 min or until the test atmosphere has stabilized.
f) Whilst still walking the subject shall perform the following exercises:
1) walking for 2 min without head movement or talking;
2) turning head from side to side (approx. 15 times), as if inspecting the walls of a tunnel
for 2 min;
3) moving the head up and down (approx. 15 times), as if inspecting the roof and floor for
2 min;
4) reciting the alphabet or an agreed text out loud as if communicating with a colleague
for 2 min;
5) walking for 2 min without head movement or talking.
g) Record
1) enclosure concentration;
2) the leakage over each exercise period.
h) Turn off the test atmosphere and when the test agent has cleared from the enclosure remove the
subject.
After each test, replace the particle filtering half mask by a new sample.
8.5.2 Method
8.5.2.1 Principle
The subject wearing the particle filtering half mask under test walks on a treadmill over which is an
enclosure.
Through this enclosure flows a constant concentration of NaCl aerosol. The air inside the particle
filtering half mask is sampled and analysed during the inhalation phase of the respiratory cycle to
determine the NaCl content. The sample is extracted by punching a hole in the particle filtering half
mask and inserting a probe through which the sample is drawn. The pressure variation inside the
particle filtering half mask is used to actuate a change-over valve so that inhaled air only is sampled. A
second probe is inserted for this purpose.
Posebna objava SIST z dovoljenjem CEN, CENELEC, ISO in IEC: Za potrebe zagotavljanja brezplačnega dostopa do vsebin standardov v času epidemije COVID-19.
Samo za branje. Kopiranje in posredovanje prepovedano. © SIST 2020-04-10
EN 149:2001+A1:2009 (E)
8.5.2.2 Test equipment (see Figure 3)
8.5.2.2.1 Aerosol generator
The NaCl aerosol shall be generated from a 2 % solution of reagent grade NaCl in distilled water. An
atomizer equivalent to the type described should be used (see Figure 4). This requires an air flow rate of
100 l/min at a pressure of 7 bar. The atomizer and its housing shall be fitted into a duct through which a
constant flow of air is maintained. It may be necessary to heat or dehumidify the air in order to obtain
complete drying of the aerosol particles.
8.5.2.2.2 Test agent
The mean NaCl concentration within the enclosure shall be (8 ± 4) mg/m and the variation throughout
the effective working volume shall be not more than 10 %. The particle size distribution shall be 0,02 µm
to 2 µm equivalent aerodynamic diameter with a mass median diameter of 0,6 µm.
8.5.2.2.3 Flame photometer
A flame photometer shall be used to measure the concentration of NaCl inside the particle filtering half
mask. Essential performance characteristics for a suitable instrument are:
a) It should be a flame photometer specifically designed for the direct analysis of NaCl aerosol;
3 3
b) It should be capable of measuring concentrations of NaCl aerosol between 15 mg/m and 5 ng/m ;
c) The total aerosol sample required by the photometer should not be greater than 15 l/min;
d) The response time of the photometer, excluding the sampling system, should not be greater than
500 ms;
e) It is necessary to reduce the response to other elements, particularly carbon, the concentration of
which will vary during the breathing cycle. This will be achieved by ensuring that the band pass width
of the interference filter is no greater than 3 nm and that all necessary side-band filters are included.
8.5.2.2.4 Sample selector
A system is required which will switch the sample to the photometer only during the inhalation phase of
the respiratory cycle. During the exhalation phase clean air shall be fed to the photometer. The essential
elements of such a system are:
a) An electrically operated valve with a response time of the order of 100 ms. The valve should have
the minimum possible dead space compatible with straight-through, unrestricted flow when open;
b) A pressure sensor which is capable of detecting a minimum pressure change of approx. 0,05 mbar
and which can be connected to a probe inserted in the cavity of the particle filtering half mask. The
sensor shall have an adjustable threshold and be capable of differential signalling when the
threshold is crossed in either direction. The sensor shall work reliably when subjected to the
accelerations produced by the head movements of the subject;
c) An interfacing system to actuate the valve in response to a signal from the pressure sensor;
d) timing device to record the proportion of the total respiratory cycle during which sampling took place.
8.5.2.2.5 Sampling probe
The probe shall be fitted securely in an airtight manner to the particle filtering half mask as near as
possible to the centre line of the particle filtering half mask. A multiple hole sampling probe is strongly
recommended.
Posebna objava SIST z dovoljenjem CEN, CENELEC, ISO in IEC: Za potrebe zagotavljanja brezplačnega dostopa do vsebin standardov v času epidemije COVID-19.
Samo za branje. Kopiranje in posredovanje prepovedano. © SIST 2020-04-10
EN 149:2001+A1:2009 (E)
Measures shall be taken to prevent the influence of condensation in the sampling probe on the
measurement (by supplying dry air). Figure 5 shows a design that has been found suitable. The probe is
adjusted so that it just touches the wearer’s lips.
Care shall be taken to ensure that the probe does not disturb the normal fit or shape of the mask.
8.5.2.2.6 Sample pump
If no pump is incorporated into the photometer an adjustable flow pump is used to withdraw an air
sample from the particle filtering half mask under test. This pump is so adjusted as to withdraw a
constant flow of 1 l/min from the sample probe. Dependent on the type of photometer it may be
necessary to dilute the sample with clean air.
8.5.2.2.7 Sampling of enclosure concentration
The enclosure aerosol concentration is monitored during the tests using a separate sampling system, to
avoid contamination of the particle filtering half mask sampling lines. It is preferable to use a separate
flame photometer for this purpose.
If a second photometer is not available, sampling of the enclosure concentration using a separate
sampling system and the same photometer may be made. However, time will then be required to allow
the photometer to return to a clean background.
8.5.2.2.8 Pressure detection probe
A second probe is fitted near to the sample probe and is connected to the pressure sensor.
8.5.2.3 Expression of results
The leakage P shall be calculated from measurements made over the last 100 s of each of the exercise
periods to avoid carry over of results from one exercise to the other.
 
C t +t
2 IN EX
 
P(%)= × ×100
 
C t
1 IN
 
where
C is the challenge concentration
C is the measured mean concentration in the breathing zone of the test subject
t is the total duration of inhalation
IN
t is the total duration of exhalation
EX
Measurement of C is preferably made using an integrating recorder.
...