oSIST prEN 13205:2010
(Main)Workplace exposure - Assessment of sampler performance for measurement of airborne particle concentrations
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
Relations
Standards Content (Sample)
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
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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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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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
1)
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
1)
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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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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3.1.11
aerodynamic diameter (of a particle)
(particle) aerodynamic diameter
-3
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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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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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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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
u
c
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
k
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
U
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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