Workplace exposure - Assessment of sampler performance for measurement of airborne particle concentrations

This European Standard specifies methods for testing aerosol samplers under prescribed laboratory conditions, and performance requirements that are specific to aerosol samplers. These performance requirements, which include conformity with the EN 481 sampling conventions, apply only to the process of sampling the airborne particles from the air, not to the process of analysing particles collected by the process of sampling. Although analysis of samples collected in the course of testing is usually necessary in order to evaluate the sampler performance, the specified test methods ensure that analytical errors are kept very low during testing and do not contribute significantly to the end result. The determination of analytical errors and factors related to them (for example the bias, precision and limit of detection of the analytical method) is outside the scope of this standard. Where the aerosol sampler requires the use of an external (rather than integral) pump, the pump is not subject to the requirements of this standard.
EN 482 contains general performance requirements for methods used for determining the concentrations of chemical agents in workplace atmospheres. These performance requirements include maximum values of expanded uncertainty (a combination of random and non-random measurement uncertainty) achievable under prescribed laboratory conditions for the methods to be used. The requirements of EN 482 apply to a complete measurement procedure, a combination of the stages consisting of sampling, sample transport/storage and sample preparation/analysis. This standard specifies how the performance of aerosol measurement procedures is assessed with respect to the general requirements of EN 482, through the combination of errors arising in the sampling, sample transportation/storage and sample preparation/analysis stages.
This standard applies to all samplers used for the health-related sampling of particles in workplace air, whatever their mode of operation.

Exposition am Arbeitsplatz - Beurteilung der Leistungsfähigkeit von Sammlern für die Messung der Konzentration luftgetragener Partikel

Diese Europäische Norm legt Verfahren zur Prüfung von Aerosolsammlern unter vorgeschriebenen Laborbedingungen fest und gibt Leistungsanforderungen an, die für Aerosolsammler spezifisch sind. Diese Leistungsanforderungen, zu denen die Übereinstimmung mit den Konventionen der EN 481 für die Probenahme gehört, gelten nur für das Verfahren der Probenahme der luftgetragenen Partikel aus der Luft, nicht für den Prozess der Untersuchung der Partikel, die im Prozess der Probenahme gesammelt wurden. Obgleich die Untersuchung der im Verlauf der Prüfung gesammelten Proben im Allgemeinen erforderlich ist, um die Leistungsfähigkeit des Sammlers zu bewerten, sichern die festgelegten Prüfverfahren, dass Untersuchungsfehler während der Prüfung sehr niedrig gehalten werden und nicht signifikant zum Endergebnis beitragen. Die Bestimmung analytischer Fehler und mit diesen verbundener Faktoren (zum Beispiel die systematische Abweichung, die Präzision und die Nachweisgrenze des Analyseverfahrens) liegt außerhalb des Anwendungsbereichs dieser Norm. Falls der Aerosolsammler die Verwendung einer äußeren Pumpe (anstatt einer eingebauten Pumpe) erfordert, unterliegt die Pumpe nicht den Anforderungen dieser Norm.
EN 482 enthält allgemeine Leistungsanforderungen an die Verfahren, die zur Bestimmung der Konzentrationen chemischer Arbeitsstoffe in Arbeitsplatzatmosphären angewendet werden. Zu diesen Leistungsanforderungen gehören Maximalwerte für die erweiterte Messunsicherheit (einer Kombination von zufälliger und nicht zufälliger Messunsicherheit), die bei den zu verwendenden Verfahren unter vorgeschriebenen Laborbedingungen erreichbar sind. Die Anforderungen nach EN 482 gelten für ein vollständiges Messverfahren, d. h. eine Kombination der Stufen, die sich aus der Probenahme, dem Transport/der Lagerung der Probe und der Probenvorbereitung/-untersuchung zusammensetzen.

Exposition sur les lieux de travail - Evaluation des performances des dispositifs de mesure des concentrations d'aérosols

La présente Norme européenne spécifie les méthodes d'essais des échantillonneurs d'aérosols soumis à des conditions de laboratoire imposées ainsi que les exigences requises spécifiques à ces échantillonneurs d'aérosols. Ces exigences en termes de performances, qui comprennent notamment la conformité aux conventions d'échantillonnage de l'EN 481, s'appliquent uniquement au processus d'échantillonnage des particules d'aérosol contenues dans l'air et non pas au processus d'analyse des particules recueillies dans le cadre du processus d'échantillonnage. Bien que l'analyse des échantillons recueillis au cours des essais soit généralement nécessaire de manière à évaluer les performances des échantillonneurs, les méthodes d'essai spécifiées permettent de conserver un très faible taux d'erreurs analytiques au cours des essais, qui n'ont pas beaucoup d'incidence sur le résultat final. La détermination des erreurs et des facteurs analytiques (par exemple le biais, la fidélité et la limite de détection de la méthode d'analyse) n'entre pas dans le domaine d'application de la présente Norme. Lorsque l'échantillonneur d'aérosol nécessite l'utilisation d'une pompe externe (plutôt qu'une pompe intégrée), la pompe n'est pas soumise aux exigences de la présente Norme.
L'EN 482 contient les exigences générales en termes de performances pour des méthodes utilisées afin de déterminer les concentrations d'agents chimiques dans les atmosphères de lieux de travail. Ces exigences en termes de performances comprennent les valeurs maximales de l'incertitude élargie (une combinaison d'incertitudes de mesure aléatoires et non aléatoires) pouvant être obtenues dans des conditions de laboratoire prédéterminées pour les méthodes devant être utilisées. Les exigences de l'EN 482 s'appliquent à un mode opératoire de mesure complet, une combinaison des étapes consistant en un échantillonnage, un transport et un stockage des échantillons et une préparation et une analyse des échantillons.

Izpostavljenost na delovnem mestu - Ocenjevanje delovnih lastnosti vzorčevalnikov za merjenje koncentracij lebdečih delcev

General Information

Status
Not Published
Current Stage
4097 - End of interruption of work - split/merged
Due Date
17-Jun-2011
Completion Date
17-Jun-2011

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SLOVENSKI STANDARD
oSIST prEN 13205:2010
01-december-2010
,]SRVWDYOMHQRVWQDGHORYQHPPHVWX2FHQMHYDQMHGHORYQLKODVWQRVWL
Y]RUþHYDOQLNRY]DPHUMHQMHNRQFHQWUDFLMOHEGHþLKGHOFHY

Workplace exposure - Assessment of sampler performance for measurement of airborne

particle concentrations

Exposition am Arbeitsplatz - Beurteilung der Leistungsfähigkeit von Sammlern für die

Messung der Konzentration luftgetragener Partikel

Exposition sur les lieux de travail - Evaluation des performances des dispositifs de

mesure des concentrations d'aérosols
Ta slovenski standard je istoveten z: prEN 13205
ICS:
13.040.30 Kakovost zraka na delovnem Workplace atmospheres
mestu
oSIST prEN 13205:2010 en,fr,de

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

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oSIST prEN 13205:2010
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oSIST prEN 13205:2010
EUROPEAN STANDARD
DRAFT
prEN 13205
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2010
ICS 13.040.30 Will supersede EN 13205:2001
English Version
Workplace exposure - Assessment of sampler performance for
measurement of airborne particle concentrations

Exposition sur les lieux de travail - Evaluation des Exposition am Arbeitsplatz - Beurteilung der

performances des dispositifs de mesure des concentrations Leistungsfähigkeit von Sammlern für die Messung der

d'aérosols Konzentration luftgetragener Partikel

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 137.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Croatia, 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.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13205:2010: E

worldwide for CEN national Members.
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oSIST prEN 13205:2010
prEN 13205:2010 (E)
Contents Page

Foreword ..............................................................................................................................................................3

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

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

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

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

3.1 Sampling and transport terms ..............................................................................................................6

3.2 Performance terms ............................................................................................................................. 10

3.3 Analysis terms .................................................................................................................................... 12

4 Symbols and abbreviations ............................................................................................................... 13

4.1 Symbols ............................................................................................................................................... 13

4.2 Enumerating subscripts ..................................................................................................................... 27

4.3 Abbreviations ...................................................................................................................................... 28

5 Requirements ...................................................................................................................................... 28

5.1 Summary of requirements ................................................................................................................. 28

5.2 Expanded uncertainty for an aerosol sampler ................................................................................ 29

5.3 Expanded uncertainty for a measurement procedure .................................................................... 29

6 Test methods ....................................................................................................................................... 30

6.1 Performance tests............................................................................................................................... 33

6.2 Overview of test methods .................................................................................................................. 34

7 Types of evaluation ............................................................................................................................ 34

7.1 Sampler evaluation ............................................................................................................................. 34

7.2 Evaluation of a measurement procedure ......................................................................................... 35

8 Instructions for use ............................................................................................................................ 35

9 Marking, quality control ..................................................................................................................... 36

9.1 Marking ................................................................................................................................................ 36

9.2 Quality control ..................................................................................................................................... 36

Annex A (normative) Laboratory performance test, based on determination of sampling efficiency

and modelling of concentrations determined by sampling............................................................ 37

Annex B (normative) Laboratory performance test, based on comparison of concentrations

determined with the candidate sampler and a validated sampler ................................................. 62

Annex C (normative) Workplace performance test, based on comparison of concentrations

determined with the candidate sampler and a validated sampler ................................................. 78

Annex D (informative) Recommended procedure for a workplace comparison of a candidate

sampler and a validated sampler in order to obtain a correction factor....................................... 94

Annex E (normative) Transport test based on weighing samples before and after shipping by mail ... 100

Annex F (normative) Handling test for loaded samplers or collection substrates using a shaker ........ 105

Annex G (normative) Calculation of expanded uncertainty for a measurement procedure ................... 109

Annex H (informative) Analysis of sampling efficiency data from a performance test according to

Annex A ............................................................................................................................................. 117

Bibliography ................................................................................................................................................... 154

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Foreword

This document (prEN 13205:2010) 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 document is currently submitted to the CEN Enquiry.

This document will supersede EN 13205:2001, which has been technically revised in order to accommodate

the revision of EN 482.
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oSIST prEN 13205:2010
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Introduction

EN 481 defines sampling conventions for the particle size fractions to be collected from workplace

atmospheres in order to assess their impact on human health. Conventions are defined for the inhalable,

thoracic and respirable aerosol fractions. These conventions represent target specifications for aerosol

samplers, giving the ideal sampling efficiency as a function of particle aerodynamic diameter.

In general, the sampling efficiency of real aerosol samplers will deviate from the target specification, and the

aerosol mass collected will therefore differ from that which an ideal sampler would collect. In addition, the

behaviour of real samplers is influenced by many factors such as external wind speed. In many cases there is

an interaction between the influence factors and fraction of the airborne size distribution of the environment in

which the sampler is used.

This standard specifies performance requirements and performance tests for samplers for the inhalable,

thoracic and respirable aerosol fractions. Requirements for the aerosol sampler and transport of loaded

collection samplers are stated. Three different performance tests for sampled concentration and a transport

test of loaded collection substrates are specified. The three tests differ in the amount of information obtained

by the test and its corresponding cost. The first test method determines the sampling efficiency curve of a

candidate sampler, the second compares concentrations sampled from three laboratory test atmospheres by

a candidate sampler and a (previously) validated sampler, and the third method compares concentrations

sampled from a specific workplace by a candidate sampler and a (previously) validated sampler. The method

for calculating the expanded uncertainty for a measurement procedure based on aerosol sampling is

specified. Additionally a method for determining equivalence between aerosol samplers at specific workplaces

and an alternative handling test are presented.
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1 Scope

This European Standard specifies methods for testing aerosol samplers under prescribed laboratory

conditions, and performance requirements that are specific to aerosol samplers. These performance

requirements, which include conformity with the EN 481 sampling conventions, apply only to the process of

sampling the airborne particles from the air, not to the process of analysing particles collected by the process

of sampling. Although analysis of samples collected in the course of testing is usually necessary in order to

evaluate the sampler performance, the specified test methods ensure that analytical errors are kept very low

during testing and do not contribute significantly to the end result. The determination of analytical errors and

factors related to them (for example the bias, precision and limit of detection of the analytical method) is

outside the scope of this standard. Where the aerosol sampler requires the use of an external (rather than

integral) pump, the pump is not subject to the requirements of this standard.

EN 482 contains general performance requirements for methods used for determining the concentrations of

chemical agents in workplace atmospheres. These performance requirements include maximum values of

expanded uncertainty (a combination of random and non-random measurement uncertainty) achievable under

prescribed laboratory conditions for the methods to be used. The requirements of EN 482 apply to a complete

measurement procedure, a combination of the stages consisting of sampling, sample transport/storage and

sample preparation/analysis. This standard specifies how the performance of aerosol measurement

procedures is assessed with respect to the general requirements of EN 482, through the combination of errors

arising in the sampling, sample transportation/storage and sample preparation/analysis stages.

This standard applies to all samplers used for the health-related sampling of particles in workplace air,

whatever their mode of operation. Different test procedures and types of evaluation are included to enable

application of this standard to a wide variety of instruments. The standard shall enable manufacturers and

users of aerosol sampling instruments to adopt a consistent approach to sampler validation, and provide a

framework for the assessment of sampler performance with respect to EN 481 and EN 482. It is the

responsibility of the manufacturer of aerosol samplers to inform the user of the sampler performance under

the laboratory conditions specified in this European Standard. It is the responsibility of the user to ensure

that the sampler complies with the overall uncertainty requirements of EN 482 under the actual conditions of

use.
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 481:1993, Workplace atmospheres — Size fraction definitions for measurement of airborne particles

EN 482:2006, Workplace atmospheres — General requirements for the performance of procedures for the

measurement of chemical agents

EN 1232:1997, Workplace atmospheres — Requirements and test methods for pumps used for personal

sampling of chemical agents in the workplace
prEN 1540:2010, Workplace exposure — Terminology

EN 12919:1999, Workplace atmospheres — Pumps for the sampling of chemical agents with a volume flow

rate of over 5 l/min — Requirements and test methods

The inhalable convention is undefined for particle sizes in excess of 100 µm or for wind speeds greater than 4 m/s. The

tests required to assess performance are therefore limited to these conditions. Should such large particle sizes or wind

speeds actually exist at the time of sampling, it is possible that different samplers meeting this standard may give different

results.
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EN 13890:2009, Workplace exposure — Procedures for measuring metals and metalloids in airborne

particles — Requirements and test methods

EN 14530:2004, Workplace atmospheres — Determination of diesel particulate matter — General

requirements

ISO 15767:2009, Workplace atmospheres — Controlling and characterising errors in weighing collected

aerosols

ISO 21438-1:2007, Workplace Air — Determination of inorganic acids by ion chromatography — Part 1: Non-

volatile acids (sulfuric acid and phosphoric acid)

ISO/DIS 21438-3:2009, Workplace Air — Determination of inorganic acids by ion chromatography — Part 3:

Hydrofluoric acid and particulate fluorides

ISO 24095:2009, Workplace air — Guidance for the measurement of respirable crystalline silica

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Sampling and transport terms
3.1.1
aerosol
airborne particles and the gas (and vapour) mixture in which they are suspended

NOTE The airborne particles can be in or out of equilibrium with their own vapours.

[prEN 1540:2010]
3.1.2
airborne particles
fine matter, in solid or liquid form, dispersed in air
[prEN 1540:2010]

NOTE 1 For the purpose of this standard, the term comprises all particles surrounded by air with a terminal settling

speed less than a critical value, whereas the critical value will depend on the application. The idea is to exclude particles

that are too large for a specific application.

NOTE 2 For the purpose of this standard, particles surrounded by air but with a terminal velocity exceeding a critical

value are not to be considered part of the sample.
3.1.3
candidate sampler

any aerosol sampler that can be used to measure the concentration of aerosol particles and whose

performance is subjected to the performance tests of this standard

NOTE A candidate sampler that meets the performance criteria will be termed a validated sampler.

3.1.4
collected sample

product of the process of air sampling that consists of the collected chemical and/or biological agents only

[prEN 1540:2010]
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oSIST prEN 13205:2010
prEN 13205:2010 (E)

NOTE For the purpose of this standard, the term comprises airborne particles collected on the sampling substrate for

subsequent analysis. See EN 15051.
3.1.5
collection efficiency

efficiency of collection and retention of sampled particles by the collection substrate

NOTE 1 The collection efficiency can, for example be influenced by the amount of aerosol deposited in the collection

substrate.

NOTE 2 The collection efficiency (of a collection substrate) should not be confused with the sampling efficiency (of a

sampler).
3.1.6
collection substrate

medium on which airborne chemical and/or biological agents are collected for subsequent analysis

[prEN 1540:2010]

NOTE 1 Filters, internal walls of a sampling cassette, impaction plate or polyurethane/metal foam and polyurethane

foams are examples of collection substrates for airborne particles.

NOTE 2 As an example of the converse, the 25-mm or 37-mm plastic filter cassette often used for “total dust” sampling

(with gravimetric analysis) in either its closed-face or open-face version is not part of the substrate in the definition above,

since it is not weighed.
3.1.7
correction function

mathematical function relating aerosol concentrations measured using a candidate sampler to those

measured using a validated sampler, determined by a comparison of the two samplers

3.1.8
inhalable fraction
inhalable aerosol fraction

mass fraction of total airborne particles which is inhaled through the nose and mouth

[prEN 1540:2010]
NOTE 1 The inhalable fraction is specified in EN 481.

NOTE 2 The inhalable fraction depends on the speed and direction of the air movement, on breathing rate and other

factors.
3.1.9
inhalable sampler
inhalable aerosol sampler
sampler for the inhalable aerosol fraction
aerosol sampler that is used to collect the inhalable fraction
[prEN 1540:2010]

NOTE An inhalable sampler collects the inhalable fraction or airborne particles, as defined in EN 481, with a

performance as stipulated in this document.
3.1.10
nominal flow rate

design flow rate recommended by the sampler manufacturer or measurement procedure

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oSIST prEN 13205:2010
prEN 13205:2010 (E)
3.1.11
aerodynamic diameter (of a particle)
(particle) aerodynamic diameter

diameter of a sphere of 1 g cm density with the same terminal settling velocity in calm air as the particle,

under the prevailing conditions of temperature, pressure and relative humidity
[prEN 1540:2010]

NOTE 1 The aerodynamic diameter of a particle depends on the size, density, shape and porosity of the particle.

NOTE 2 For particles of aerodynamic diameter less than 0,5 µm, the particle thermodynamic diameter should be used

instead of the particle aerodynamic diameter.
3.1.12
personal sampler

sampler, attached to a person, that collects gases, vapours or airborne particles in the breathing zone to

determine exposure to chemical and/or biological agents
[prEN 1540:2010]
NOTE For the purpose of this standard “agent” means airborne particles.
3.1.13
relative concentration
concentration expressed as a fraction of the total airborne concentration
3.1.14
respirable fraction
respirable aerosol fraction
mass fraction of inhaled particles penetrating to the unciliated airways
NOTE The respirable fraction is specified in EN 481.
[prEN 1540:2010]
3.1.15
respirable sampler
respirable aerosol sampler
sampler for the respirable aerosol fraction
aerosol sampler that is used to collect the respirable fraction
[prEN 1540:2010]

NOTE A respirable sampler collects the respirable fraction or airborne particles, as defined in EN 481, with a

performance as stipulated in this document.
3.1.16
aerosol sampler
sampler that is used to transport airborne particles to a collection substrate
NOTE The transport can be either active or passive.
[prEN 1540:2010]
3.1.17
sampler inlet efficiency

for each particle aerodynamic diameter, the ratio of aerosol concentration passing through the sampler inlet

system, to the corresponding total airborne particle concentration
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oSIST prEN 13205:2010
prEN 13205:2010 (E)

NOTE The inlet efficiency is the product of the aspiration efficiency, which characterises the aerodynamic behaviour

of the sampler orifice, and the size-dependent effects of particle bounce and losses both inside and outside the inlet. The

inlet losses can, for some samplers, also depend on external factors such as wind speed and aerosol size distribution.

3.1.18
sampler specimen
sampler individual
single individual of a given type of aerosol sampler
3.1.19
sampling cassette

cassette mounted inside a sampler, designed in such a way that its collection substrate consists of all its

interior surfaces (bounding the air-stream with sampled particles), and usually contains a filter or a foam

3.1.20
sampling efficiency (of an aerosol sampler)
(aerosol) sampler efficiency
efficiency curve (of an aerosol sampler)

for each aerodynamic diameter of a particle, the relative fraction of the concentration of airborne particles

transported from the undisturbed air to the collection substrate for analysis

NOTE 1 The sampling efficiency is independent of whether the particle concentration is determined by number, surface

area or mass.

NOTE 2 For a sampler with internal separation, the sampling efficiency is the product of the inlet efficiency and the

separation efficiency.
[prEN 1540:2010]
3.1.21
sampling method

part of the measurement procedure that describe the overall process of sampling, including sampler

preparation and sample transport
3.1.22
sampling process

physical mechanisms by which particles are selectively aspirated into a sampler inlet, graded by means of

inertial or other forces, transported to the collection substrate or to other internal surfaces, or lost from the

collection substrate
3.1.23
penetration
internal penetration

for each particle aerodynamic diameter, the ratio of the sampling efficiency to the inlet efficiency

NOTE This describes the efficiency with which particles pass through the stage of inertial separation, as e.g. foams,

cyclones, impactors.
3.1.24
static sampler

sampler, not attached to a person, that collects gases, vapours or airborne particles at a particular location

[prEN 1540:2010]
3.1.25
total airborne particle concentration

concentration of aerosol particles present in the air before the particles are affected by the presence of the

sampler, or in the case of a personal sampler by the presence of the person wearing the sampler

NOTE See prEN 1540:2010 for the definition of total airborne particles.
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prEN 13205:2010 (E)
3.1.26
thoracic fraction
thoracic aerosol fraction
mass fraction of inhaled particles penetrating beyond the larynx
NOTE The thoracic fraction is specified in EN 481.
[prEN 1540:2010]
3.1.27
thoracic sampler
thoracic aerosol sampler
sampler for the thoracic aerosol fraction
aerosol sampler that is used to collect the thoracic fraction
[prEN 1540:2010]

NOTE A thoracic sampler collects the thoracic fraction or airborne particles, as defined in EN 481, with a

performance as stipulated in this document.
3.1.28
validated sampler (Annex A)

sampler that has previously been tested using the methods described in Annex A of this document resulting in

a performance as required by this document

NOTE In a performance test according to Annex A, the sampling efficiency curve of the candidate sampler will be

determined as a function of particle size (and possibly other influencing factors).

3.1.29
validated sampler (Annex B)

sampler that has previously been tested using the methods described in Annex B of this document resulting in

a performance as required by this document

NOTE In a performance test according Annex B, the concentration sampled by the candidate sampler will be

compared with the concentration sampled by a validated reference sampler, for at least three test aerosols.

3.1.30
validated sampler (Annex C)

sampler that has previously been tested using the methods described in Annex C of this document resulting in

a performance as required in this document

NOTE In a performance test according Annex C, the concentration sampled by the candidate sampler at a workplace

will be compared with the concentration sampled by a validated reference sampler.

3.2 Performance terms
3.2.1
bias

difference between the expectation of a test result or measurement result and a true value

[ISO 3534-2:2006]

NOTE 1 Bias is the total systematic error as contrasted to random error. There may be one or more systematic error

components contributing to the bias. A larger systematic difference from the true value is reflected by a larger bias value.

NOTE 2 In practice, the accepted reference value is substituted for the true value. The accepted reference value (for

definition see ISO 3534-2) can be, for example, the certified value of a reference material, the concentration of a standard

test atmosphere or the target value of an interlaboratory comparison.
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prEN 13205:2010 (E)

NOTE 3 In this European Standard the true value of the concentration of a chemical agent in air will be the

concentration calculated to be sampled by an ideal sampler with a sampling efficiency identical to the sampling convention

or sampled by a validated sampler.
3.2.2
combined standard uncertainty

standard uncertainty of the result of measurement when that result is obtained from the values of a number of

other quantities, equal to the positive square root of a sum of terms, the terms being the variances or

covariances of these other quantities weighted according to how the measurement result varies with changes

in these quantities
[ENV 13005:1999]
3.2.3
coverage factor

numerical factor used as a multiplier of the combined standard uncertainty in order to obtain an expanded

uncertainty
[ENV 13005:1999]
NOTE 1 A coverage factor, k , is typically in the range from 2 to 3.
NOTE 2 EN 482 specifies k = 2.
3.2.4
expanded uncertainty

quantity defining an interval about a result of a measurement, expected to encompass a large fraction of the

distribution of values that could reasonably be attributed to the measurand
[ENV 13005:1999]
3.2.5
(occupational exposure) limit value

limit of the time-weighted average of the concentration of a chemical agent in the air within the breathing zone

of a worker in relation to a specified reference period
[Council Directive 98/24/EC Art. 2 d)]
3.2.6
measurand
particular quantity subject to measurement
[ENV 13005:1999]
3.2.7
measuring procedure
measurement procedure

set of operations described specifically for the sampling and analysis of chemical or biological agents in air

NOTE A measuring procedure usually includes preparation for sampling, sampling, transportation and storage,

preparation of samples for analysis and analysis.
[prEN 1540:2010]
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3.2.8
non-random uncertainty
uncertainty associated with systematic errors
[prEN 1540:2010]
3.2.9
precision

closeness of agreement between independent test/measurement results obtained under stipulated conditions

[ISO 3534-2:2006]
3.2.10
random uncertainty
uncertainty associated with random errors
[prEN 1540:2010]
3.2.11
sampler bias
bias of the sampling method
3.2.12
specified measuring range

the set of values of the concentration for which the uncertainty of measurement is intended to lie within

specified limits
3.2.13
standard uncertainty
uncertainty of the result of a measurement expressed as a standard deviation
[ENV 13005:1999]
3.2.14
uncertainty (of measurement)

parameter, associated with the results of a measurement, that characterizes the dispersion of the values that

could reasonably be attributed to the measurand
[ENV 13005:1999]
3.3 Analysis terms
3.3.1
analysis
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