Workplace exposure - Measurement of dustiness of bulk materials that contain or release respirable NOAA or other respirable particles - Part 3: Continuous drop method

This European Standard provides the methodology for measuring the dustiness of bulk materials that contain or release nano-objects or submicrometer particles, under standard and reproducible conditions and specifies for that purpose the continuous drop method.
In addition, this European Standard specifies the selection of instruments and devices and the procedures for calculating and presenting the results. It also gives guidelines on the evaluation and reporting of the data.
The methodology described in this European Standard enables
a)   the measurement of the respirable and inhalable dustiness mass fractions,
b)   the measurement of the number-based dustiness index of respirable particles in the size range from about 10 nm to 1 000 nm,
c)   the measurement of the number-based emission rate of respirable particles in the size range from about 10 nm to 1 000 nm,
d)   the measurement of the number-based size distribution of the released aerosol in the size range from about 10 nm to 10 µm, and
e)   the collection of released airborne particles in the respirable fraction for subsequent observations and analysis by analytical electron microscopy.
This European Standard is applicable to the testing of a wide range of bulk materials including powders, granules or pellets containing or releasing nano-objects or submicrometer particles in either unbound, bound uncoated and coated forms.
This European Standard is applicable to all bulk materials containing nanoparticles or releasing nanoparticles while being handled.
NOTE 1   Currently no number-based classification scheme in terms of dustiness indices or emission rates have been established. Eventually, when a large number of measurement data has been obtained, the intention is to revise this European Standard and to introduce such a classification scheme, if applicable.
NOTE 2   The methods specified in this European Standard have not been evaluated for nanofibers and nanoplates.

Exposition am Arbeitsplatz - Messung des Staubungsverhaltens von Schüttgütern, die Nanoobjekte oder Submikrometerpartikel enthalten oder freisetzen - Teil 3: Verfahren mit kontinuierlichem Fall

Diese Europäische Norm enthält die Methodik für die Messung des Staubungsverhaltens von Schüttgütern, die Nanoobjekte oder Partikel im Submikrometerbereich enthalten oder unter wiederholbaren und Standardbedingungen freisetzen, und legt zu diesem Zweck das Verfahren mit kontinuierlichem Fall fest.
Darüber hinaus legt diese Europäische Norm die Auswahl der Instrumente und Vorrichtungen sowie die Verfahren für die Berechnung und Präsentation der Ergebnisse fest. Des Weiteren enthält die Norm eine Anleitung für die Auswertung und Angabe der Daten.
Die in dieser Europäischen Norm festgelegte Methodik ermöglicht
a)   die Messung des Massenanteils an alveolengängigem und einatembarem Staub,
b)   die Messung des zahlenbasierten Staubindex alveolengängiger Partikel im Größenbereich zwischen ungefähr 10 nm und 1 000 nm,
c)   die Messung der zahlenbasierten Emissionsrate alveolengängiger Partikel im Größenbereich zwischen ungefähr 10 nm und 1 000 nm,
d)   die Messung der zahlenbasierten Größenverteilung des freigesetzten Aerosols im Größenbereich zwischen ungefähr 10 nm und 10 µm und
e)   die Sammlung freigesetzter Schwebstoffe in der alveolengängigen Fraktion für anschließende Beobachtungen und Analysen durch analytische Elektronenmikroskopie.
Diese Europäische Norm gilt für die Prüfung einer Vielzahl unterschiedlicher Schüttgüter einschließlich Pulver, Granulate oder Pellets, die Nanoobjekte oder Partikel im Submikrometerbereich in ungebundener, gebundener und unbeschichteter und beschichteter Form enthalten oder freisetzen.
Diese Europäische Norm gilt für alle Schüttgüter, die Nanopartikel enthalten oder während der Handhabung freisetzen.
ANMERKUNG 1   Bisher wurde noch kein zahlenbasiertes Klassifizierungsschema im Hinblick auf Staubungsindizes oder Emissionsraten entwickelt. Schließlich, wenn eine große Anzahl an Messdaten vorliegt, ist beabsichtigt, diese Europäische Norm zu revidieren und ein solches Klassifizierungsschema einzuführen.
ANMERKUNG 2   Die in dieser Europäischen Norm festgelegten Verfahren wurden nicht für Nanofasern und Nanoplättchen beurteilt.

Exposition sur les lieux de travail - Mesurage du pouvoir de resuspension des matériaux en vrac contenant ou émettant des nano-objets et leurs agrégats et agglomérats (NOAA) ou autres particules en fraction alvéolaire - Partie 3: Méthode de la chute continue

Le présent document décrit la méthodologie permettant de mesurer le pouvoir de resuspension de matériaux en vrac contenant ou émettant des NOAA ou autres particules en fraction alvéolaire dans des conditions normalisées et reproductibles et spécifie, à cette fin, le but de la méthode de la chute continue.
Le présent document spécifie le choix des instruments et dispositifs ainsi que les procédures de calcul et d’expression des résultats. Il fournit également des lignes directrices concernant l’évaluation et la consignation des données.
La méthodologie décrite dans le présent document permet :
a)   le mesurage des fractions massiques des poussières alvéolaires et, facultativement, inhalables ;
b)   le mesurage de l’indice du pouvoir de resuspension en nombre des particules dans la plage granulométrique comprise entre environ 10 nm et 1 µm ;
c)   le mesurage du taux d’émission en nombre des particules dans la plage granulométrique comprise entre environ 10 nm et 1 µm ;
d)   le mesurage de la distribution granulométrique en nombre des particules d’aérosol libérées dans la plage granulométrique comprise entre environ 10 nm et 10 µm ; et
e)   la collecte des particules en suspension dans l’air libérées dans la fraction massique des poussières alvéolaires pour des observations et une analyse supplémentaires par microscopie électronique.
Le présent document est applicable aux essais relatifs à une gamme étendue de matériaux en vrac, y compris des matériaux granulaires, en poudre ou sous forme de pastilles contenant ou émettant des NOAA ou autres particules en fraction alvéolaire sous formes revêtues, non revêtues, liées et non liées.
NOTE 1   Aucun système de classification basé sur le nombre en termes d’indices de pouvoir de resuspension ou de taux d’émission n’a encore été établi. Dès lors que des données de mesure seront disponibles en grand nombre, il est prévu de réviser le présent document et d’introduire un tel système de classification, le cas échéant.
NOTE 2   Les méthodes spécifiées dans le présent document n’ont pas été évaluées pour les nanofibres et les nanofeuillets.

Izpostavljenost na delovnem mestu - Meritve prašnosti razsutih materialov, ki vsebujejo ali sproščajo respirabilne nanopredmete ter njihove agregate in aglomerate (NOAA) in druge respirabilne delce - 3. del: Metoda trajnega padanja

Ta evropski standard določa metodologijo za merjenje prašnosti razsutih materialov, ki vsebujejo ali sproščajo nanopredmete ali submikrometrske delce v standardnih in ponovljivih pogojih, ter za ta namen določa metodo trajnega padanja.
Poleg tega navaja ta evropski standard tudi izbiro instrumentov in naprav ter postopke za izračun in predstavitev rezultatov. Podaja tudi smernice za vrednotenje in poročanje podatkov.
Metodologija, ki je opisana v tem evropskem standardu, omogoča:
a)   merjenje masnih deležev pri respirabilni in inhalabilni prašnosti,
b)   merjenje indeksa prašnosti respirabilnih delcev na podlagi števila v razponu velikosti od približno 10 nm to 1000 nm,
c)   merjenje stopnje emisij respirabilnih delcev na podlagi števila v razponu velikosti od približno 10 nm to 1000 nm,
d)   merjenje porazdelitve velikosti sproščenega aerosola na podlagi števila v razponu velikosti od približno 10 nm to 10 µm,
e)   zbiranje sproščenih lebdečih delcev v respirabilnih deležih za nadaljnje opazovanje in analizo z analitsko elektronsko mikroskopijo.
Ta evropski standard se uporablja za preskušanje širokega nabora razsutih materialov, vključno s praški, granulami in peleti, ki vsebujejo ali sproščajo nanopredmete ali submikrometrske delce v nevezani, vezani, prevlečeni ali neprevlečeni obliki.
Ta evropski standard se uporablja za vse razsute materiale, ki vsebujejo nanodelce ali med ravnanjem z njimi sproščajo nanodelce.
OPOMBA 1:   Za indekse prašnosti ali stopnje emisij trenutno še ni vzpostavljena nobena klasifikacijska shema na podlagi števil. Ko bo sčasoma pridobljenih veliko merilnih podatkov, je predvidena revizija tega evropskega standarda in uvedba take klasifikacijske sheme, če bo to ustrezno.
OPOMBA 2:   Metode, ki so navedene v tem evropskem standardu, še niso ocenjene za nanovlakna in nanoplošče.

General Information

Status
Published
Public Enquiry End Date
04-Mar-2018
Publication Date
25-Jun-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Jun-2019
Due Date
18-Aug-2019
Completion Date
26-Jun-2019

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SLOVENSKI STANDARD
SIST EN 17199-3:2019
01-september-2019
Izpostavljenost na delovnem mestu - Meritve prašnosti razsutih materialov, ki
vsebujejo ali sproščajo respirabilne nanopredmete ter njihove agregate in
aglomerate (NOAA) in druge respirabilne delce - 3. del: Metoda trajnega padanja
Workplace exposure - Measurement of dustiness of bulk materials that contain or

release respirable NOAA or other respirable particles - Part 3: Continuous drop method

Exposition am Arbeitsplatz - Messung des Staubungsverhaltens von Schüttgütern, die

Nanoobjekte oder Submikrometerpartikel enthalten oder freisetzen - Teil 3: Verfahren mit

kontinuierlichem Fall

Exposition sur les lieux de travail - Mesurage du pouvoir de resuspension des matériaux

en vrac contenant ou émettant des nano-objets et leurs agrégats et agglomérats (NOAA)

ou autres particules en fraction alvéolaire - Partie 3: Méthode de la chute continue

Ta slovenski standard je istoveten z: EN 17199-3:2019
ICS:
13.040.30 Kakovost zraka na delovnem Workplace atmospheres
mestu
SIST EN 17199-3:2019 en,fr,de

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

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SIST EN 17199-3:2019
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SIST EN 17199-3:2019
EN 17199-3
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 13.040.30
English Version
Workplace exposure - Measurement of dustiness of bulk
materials that contain or release respirable NOAA or other
respirable particles - Part 3: Continuous drop method

Exposition sur les lieux de travail - Mesurage du Exposition am Arbeitsplatz - Messung des

pouvoir de resuspension des matériaux en vrac Staubungsverhaltens von Schüttgütern, die

contenant ou émettant des nano-objets et leurs Nanoobjekte oder Submikrometerpartikel enthalten

agrégats et agglomérats (NOAA) ou autres particules oder freisetzen - Teil 3: Verfahren mit

en fraction alvéolaire - Partie 3: Méthode de la chute kontinuierlichem Fall
continue
This European Standard was approved by CEN on 8 February 2019.

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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17199-3:2019 E

worldwide for CEN national Members.
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SIST EN 17199-3:2019
EN 17199-3:2019 (E)
Contents Page

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

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 6

4 Symbols and abbreviations ......................................................................................................................... 6

5 Principle ............................................................................................................................................................. 6

6 Equipment ......................................................................................................................................................... 8

6.1 General ................................................................................................................................................................ 8

6.2 Test apparatus.................................................................................................................................................. 9

7 Requirements ................................................................................................................................................ 11

7.1 General ............................................................................................................................................................. 11

7.2 Engineering control measures ................................................................................................................ 11

7.3 Conditioning of the test material ............................................................................................................ 11

7.4 Conditioning of the test equipment ....................................................................................................... 12

8 Preparation .................................................................................................................................................... 12

8.1 Test sample .................................................................................................................................................... 12

8.2 Moisture content of the test material ................................................................................................... 12

8.3 Bulk density of the test material ............................................................................................................ 12

8.4 Sampling for analytical or imaging purposes .................................................................................... 12

8.5 Preparation of test apparatus ................................................................................................................. 12

9 Test procedure .............................................................................................................................................. 13

10 Evaluation of data ........................................................................................................................................ 15

10.1 Respirable dustiness mass fraction ....................................................................................................... 15

10.2 Number-based dustiness index ............................................................................................................... 15

10.3 Number-based emission rate ................................................................................................................... 16

10.4 Additional results of the tests .................................................................................................................. 16

10.5 Morphology and chemical characterization of the particles ........................................................ 16

11 Test report ...................................................................................................................................................... 17

Annex A (informative) Description and characteristic properties of the continuous drop

method ............................................................................................................................................................. 18

A.1 General ............................................................................................................................................................. 18

A.2 Energy input and dust developing procedure ................................................................................... 18

A.3 Analytical methods and results ............................................................................................................... 19

Annex B (informative) Illustration of an experimental CDD set-up example ...................................... 20

Bibliography ................................................................................................................................................................. 24

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SIST EN 17199-3:2019
EN 17199-3:2019 (E)
European foreword

This document (EN 17199-3:2019) has been prepared by Technical Committee CEN/TC 137

“Assessment of workplace exposure to chemical and biological agents”, 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 September 2019 and conflicting national standards

shall be withdrawn at the latest by September 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 has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

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.
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SIST EN 17199-3:2019
EN 17199-3:2019 (E)
Introduction

Dustiness measurement and characterization provide users (e.g. manufacturers, producers,

occupational hygienists and workers) with information on the potential for dust emissions when the

bulk material is handled or processed in workplaces. They provide the manufactures of bulk materials

containing NOAA with information that can help to improve their products and reduce their dustiness.

It allows the users of the bulk materials containing NOAA to assess the controls and precautions

required for handling and working with the material and the effects of pre-treatment (e.g. modify

surface properties or chemistry). It also allows the users to select less dusty products, if available. The

particle size distribution of the aerosol and the morphology and chemical composition of its particles

can be used by occupational hygienists, scientists and regulators to further characterize the aerosol in

terms of particle size distribution and chemical composition and to thus aid users to evaluate and

control the health risk of airborne dust.

This document gives details on the design and operation of the continuous drop method that measures

the dustiness of bulk materials that contain or release respirable NOAA or other respirable particles in

terms of dustiness indices or emission rates. Dustiness indices as well as emission rates can be number-

based or mass-based. In addition, the test method characterizes the released aerosol by measuring the

particle size distribution and emission rate using on-line methods and collects samples for off-line

analysis (as required) for their morphology and chemical composition. This test uses the same dust

generation methods and the same set-up including dimensions of the apparatus specified in

EN 15051-3. The determination of the inhalable and respirable dustiness mass fractions (see EN 481

[1]) of the released dust from a bulk material containing NOAA is carried out separately according to

EN 15051-1 and EN 15051-3.

The continuous drop method is useful for addressing the ability of bulk materials including

nanomaterials (in powder form), to release airborne particles (aerosol) during agitation, the so-called

dustiness.

The continuous drop method has been designed to simulate workplace scenarios and to represent

general bulk material handling processes, including processes where bulk material is tipped, poured,

mixed, scooped, dropped or similar; either mechanical or by hand.

The continuous drop method presented here differs from the rotating drum, the small rotating drum

and the vortex shaker method presented in EN 17199-2 [2], EN 17199-4 [3] and EN 17199-5 [4]

respectively. The rotating drum and small rotating drum methods perform, both, repeated pouring or

agitation of the same sample bulk material while the vortex shaker method simulates vigorous agitation

of a bulk material.

This document was developed based on the results of pre-normative research [5]. This project

investigated the dustiness of ten bulk materials (including nine bulk nanomaterials) with the intention

to test as wide a range of bulk materials as possible in terms of magnitude of dustiness, chemical

composition and primary particle size distribution as indicated by a large range in specific surface area.

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SIST EN 17199-3:2019
EN 17199-3:2019 (E)
1 Scope

This document provides the methodology for measuring the dustiness of bulk materials that contain or

release respirable NOAA or other respirable particles, under standard and reproducible conditions and

specifies for that purpose the continuous drop method.

This document specifies the selection of instruments and devices and the procedures for calculating and

presenting the results. It also gives guidelines on the evaluation and reporting of the data.

The methodology described in this document enables

a) the measurement of the respirable and, optionally, the inhalable dustiness mass fractions,

b) the measurement of the number-based dustiness index of particles in the particle size range from

about 10 nm to about 1 µm,

c) the measurement of the number-based emission rate of particles in the particle size range from

about 10 nm to about 1 µm,

d) the measurement of the number-based particle size distribution of the released aerosol in the

particle size range from about 10 nm to about 10 µm, and

e) the collection of released airborne particles in the respirable dustiness mass fraction for

subsequent observations and analysis by analytical electron microscopy.

This document is applicable to the testing of a wide range of bulk materials including powders, granules

or pellets containing or releasing respirable NOAA or other respirable particles in either unbound,

bound uncoated and coated forms.

NOTE 1 Currently no number-based classification scheme in terms of dustiness indices or emission rates have

been established. Eventually, when a large number of measurement data has been obtained, the intention is to

revise this document and to introduce such a classification scheme, if applicable.

NOTE 2 The methods specified in this document have not been evaluated for nanofibers and nanoplates.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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.

CEN ISO/TS 80004-2, Nanotechnologies - Vocabulary - Part 2: Nano-objects (ISO/TS 80004-2)

EN 1540, Workplace exposure - Terminology

EN 13205-2, Workplace exposure - Assessment of sampler performance for measurement of airborne

particle concentrations - Part 2: Laboratory performance test based on determination of sampling

efficiency

EN 15051-1, Workplace exposure - Measurement of the dustiness of bulk materials - Part 1: Requirements

and choice of test methods

EN 15051-3, Workplace exposure - Measurement of the dustiness of bulk materials - Part 3: Continuous

drop method

EN 16897, Workplace exposure - Characterization of ultrafine aerosols/nanoaerosols - Determination of

number concentration using condensation particle counters
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SIST EN 17199-3:2019
EN 17199-3:2019 (E)

EN 17199-1, Workplace exposure - Measurement of dustiness of bulk materials that contain or release

respirable NOAA or other respirable particles - Part 1: Requirements and choice of test methods

EN ISO 13137, Workplace atmospheres - Pumps for personal sampling of chemical and biological agents -

Requirements and test methods (ISO 13137)

ISO 27891, Aerosol particle number concentration - Calibration of condensation particle counters

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 1540, EN 15051-1,

CEN ISO/TS 80004-2 and EN 17199-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Symbols and abbreviations
® Aerodynamic Particle Sizer
APS
BET Brunauer–Emmett–Teller
CDD Continuous Drop Device
CPC Condensation Particle Counter
d A lower particle size at which the counting or sampling efficiency is 50 %
DEMC Differential Electrical Mobility Classifier
DMAS Differential Mobility Analysing system
NOAA Nano-objects, and their aggregates and agglomerates > 100 nm
RH Relative Humidity
SEM Scanning Electron Microscopy
TEM Transmission Electron Microscopy
5 Principle

The continuous drop method (see Annex A) described in this document measures the dustiness of bulk

materials containing or releasing respirable NOAA or other respirable particles in terms of

— the respirable and inhalable dustiness mass fractions,
— the number-based dustiness index, and
— the number-based emission rate.

1) APS is the trade name or trademark of a product supplied by TSI Instruments Ltd. This information is given

for the convenience of users of this European Standard and does not constitute an endorsement by CEN of the

product named. Equivalent products may be used if they can be shown to lead to the same results.

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SIST EN 17199-3:2019
EN 17199-3:2019 (E)

In addition, this document describes the procedures by which the aerosols can be further characterized

in terms of their particle size distributions and the morphology and chemical composition of their

airborne particles.

The sampling for the purpose of and the execution of qualitative or quantitative analysis of the

morphology and chemical composition of the collected airborne particles are described. Performing

these analyses is optional but can provide confirmation of the sizes of the particles generated and

complementary information to the real-time instruments.
Table 1 provides
— an overview of the different measurands,
— information on whether determining these measurands is mandatory or not, and
— the aerosol instruments and sampling devices needed to determine a measurand.

Table 1 — Measurands, aerosol instruments/sampling devices and associated recommendations

for the continuous drop method
Mandatory /
Method / device specific to
Measurand (unit)
optional
measurand
Mandatory
Respirable dustiness mass fraction (mg/kg)
Filters according to EN 15051-1
and EN 15051-3
Optional
Inhalable dustiness mass fraction (mg/kg)
Number-based dustiness index of particles in Mandatory
the particle size range from about 10 nm to
Condensation Particle Counter
about 1 µm (1/mg)
(CPC) covering the particle size
range from about 10 nm to
Number-based average emission rate of Mandatory
about 1 µm
particles in the particle size range from about
10 nm to about 1 µm (1/mg·s)
Number of modes of the time-averaged Mandatory
number-based particle size distribution as
dN/dlogD (-) ®
DMAS/APS combination
covering the particle size
Modal aerodynamic equivalent diameters Mandatory
particle from about 10nm to
corresponding to the highest mode (M1 ) and
about 10 µm
to the second highest mode (M2 ) of the time-
averaged number-based particle size
distribution as dN/dlogD (µm)
Sampling device, e.g. filters, Optional
Morphological and chemical characterization
according to EN 15051-1 and
of the particles including NOAA
EN 15051-3

NOTE The particle size range described above is based on the equipment used during the

prenormative research.
However, see 6.2.8 for possible alternate solutions.

The determination of the inhalable and respirable dustiness mass fractions of the released dust from a

bulk material containing NOAA can be carried out within the same test run according to EN 15051-1

and EN 15051-3.
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SIST EN 17199-3:2019
EN 17199-3:2019 (E)
6 Equipment
6.1 General
The test set-up used shall comply with all requirements of EN 15051-3.

The test apparatus required in order to determine the dustiness by the continuous drop test method is

shown in Figure 1.
An illustration for an experimental test set-up example is given in Annex B.
Dimensions in millimetres
Key
1 feeder (6.2.2)
2 drop pipe (6.2.3)
3 main pump

4 sampler for gravimetric analysis (6.2.7), e.g. cyclone for the respirable dustiness mass fraction

5 online monitors
6 conditioned air, 53 l/min
7 collector tank (6.2.6) for fallen powder/ feed rate check
Figure 1 — Test apparatus
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SIST EN 17199-3:2019
EN 17199-3:2019 (E)
6.2 Test apparatus
The usual laboratory apparatus and, in particular, the following:
6.2.1 Continuous drop device, with characteristics as described in EN 15051-3.
6.2.2 Feeder, comprising of

a) a sample tank, large enough to hold the entire volume of the test substance for an entire test run;

b) a metering device for the powder mass flow, which does not change the composition and

properties of the test material, e.g. by compacting or other mechanical processes, or, if some

influence cannot be prevented, it should be minimized.

The metering device shall be suited at least for mass flows in the intended range from 3 g/min to

30 g/min, and should be suited for smaller mass flows as well.

The whole feeder shall be made from inert material, e.g. stainless steel. It shall be closed off during the

experiments and no air leakage may enter the system via the feeder during the experiments.

NOTE A vibrating chute with adjustable feed rate has been shown to work well.
6.2.3 Drop pipe, with an inner diameter of 15 mm and a length of 400 mm.

The drop pipe shall be made from inert and electrically conducting material, e.g. stainless steel.

The drop pipe is a thin-walled tube.
6.2.4 Backflow pipe, round with an inner diameter of 150 mm.

The backflow pipe shall be manufactured from an inert and electrically conducting material, e.g.

stainless steel. Within the backflow pipe a vertical air speed of 0,053 m/s, measured below the end of

the drop pipe (6.2.3) shall be generated. It is critically important that a constant vertical air speed of

0,053 m/s is maintained as the sum of the main pump’s flow rate and those of all sampling/measuring

devices employed in the tests. For this purpose, a suitable instrument (e.g. a mass-flow controller

(6.2.5)) to control the air flow generated by the main pump shall be in place.

The backflow pipe needs to be equipped with suitable openings/probes to connect the sampling

devices. All openings shall be situated in one measurement plane (i.e. in an identical distance from the

metering device 100 mm above the end of the drop pipe. They shall be situated in a symmetrical way

around the drop pipe (i.e. for example if two openings are needed, they shall be opposite one another, if

three are needed they shall be situated in a 120° orientation). Additionally, in the case of different

sampling flow rates of the applied devices, they shall be oriented in such a way as to generate as

homogenous distributions of sampling flows (out of the backflow pipe) as possible, in order to avoid

inhomogeneous air flows in the vicinity of the end of the drop pipe.

6.2.5 Mass-flow controller, or another suitable instrument to control the air flow generated by the

main pump.
6.2.6 Collector tank, made from inert material, e.g. stainless steel.

The collector tank for the fallen powder shall be mounted to the backflow pipe (6.2.4). It is used to

collect the dropped powder and shall be suited for weighing.

In addition, the external air which generates the upstream air flow within the backflow pipe (6.2.4),

shall be cleaned of environmental particles by use of a suitable filter (a target particle number

concentration of less than 20 particles/cm shall be guaranteed) and pass through the collector tank.

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EN 17199-3:2019 (E)
6.2.7 Sampler for gravimetric analysis, according to EN 15051-3.

The sampling of the respirable fraction of aerosol shall comply with EN 13205-2, and the respective

pumps shall comply with EN ISO 13137.

6.2.8 Condensation Particle Counter (CPC), or another real time instrument for particle number

concentration with a detectable particle size range from 10 nm to 1 µm.

The particle number concentration shall be measured using a condensation particle counter (CPC)

during the three actual test runs and averaging the results. Additionally or alternatively, the cumulated

number-based particle size distributions of the DMAS and the APS devices may be used to calculate

particle number concentrations over specific particle size ranges (see 6.2.9). This is necessary in those

cases, where the CPC is not applicable due to very high particle concentrations in the test atmosphere.

The use of a pre-separator like a cyclone to remove larger particles is not recommended in these cases,

as it can cause inadvertent particle losses. By use of a DMAS device specific information on the ultrafine

particle size range (14 nm to 700 nm) is available. By use of an APS device information on the particle

size range of agglomerates and aggregates covering the particle size range of the respirable and thoracic

fraction is available.

NOTE Different instruments or instrument combinations can be applicable but have not yet been tested

successfully. In the text, they are referred to as CPC (6.2.8).
The CPC used shall operate under the following parameters:
— the minimal detectable particle size (d ) of the instrument shall be 10 nm;
— the maximum detectable particle shall be about 1 µm;
— the working fluid of the instrument shall be an alcohol;
— the data shall be collected every one second.

The CPC shall be calibrated in accordance to ISO 27891 and its response checked following the

recommendations given in EN 16897.

6.2.9 Real-time instruments for number-based particle size distribution (time-resolved

instruments).

To measure the number-based particle size distribution during the repetitive runs, a DMAS device and

an APS device are used. For the DMAS device, the selection of flow parameters is of crucial importance.

The connection of particle size distributions of the DMAS and the APS device sets certain limits in this

aspect. On the other hand, the aerosol flow needs to be set above a certain numerical value and the ratio

of aerosol flow rate to sheath flow rate shall be in the range from 1:3 to 1:5.

NOTE Experiments have shown that severe undersampling of particles (one to two orders of magnitude) can

occur if the DEMC aerosol flow rate is below 0,7 l/min. Above 0,9 l/min, no further significant increase in particle

concentration was observed.

To measure the particle size distribution, the DMAS device shall be used with the following

experimental parameters:

— DEMC aerosol flow rate (l/min): sheath flow rate (l/min) = 0,9 : 4,5 (alternatively 1,5 : 4,5),

butanol CPC. The exact flow rates shall be stated in the test report as of Clause 11 of this document;

— scan time 120 s, down 30 s, pause 30 s, total 180 s;

2) In the pre-normative research upon which this standard is based, a DEMC type TSI 3081(long) was used.

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EN 17199-3:2019 (E)
— multicharge correction off;
— diffusion-loss correction on;
— nanoparticle aggregate Mobility analysis off.

The APS shall be used with an appropriate dilution system if the cumulative particle concentration

® 3
detected by APS exceeds 2 000 particles/cm .

To measure the particle size distribution in the respirable range, the APS shall be u

...

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