EN 14662-3:2005

SLOVENSKI STANDARD
01-september-2005
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Ambient Air Quality - Standard method for the measurement of benzene concentrations -
Part 3: Automated pumped sampling with in situ gas chromatography
Luftbeschaffenheit - Standardverfahren zur Bestimmung von Benzolkonzentrationen -
Teil 3: Automatische Probenahme mit einer Pumpe mit gaschromatographischer In-situ-
Bestimmung
Qualité de l'air ambiant - Méthode normalisée pour le mesurage de la concentration en
benzene - Partie 3 : Prélevement par pompage automatique avec analyse
chromatographique en phase gazeuse sur site
Ta slovenski standard je istoveten z: EN 14662-3:2005
ICS:
13.040.20 Kakovost okoljskega zraka Ambient atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 14662-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 13.040.20
English version
Ambient Air Quality - Standard method for the measurement of
benzene concentrations - Part 3: Automated pumped sampling
with in situ gas chromatography
Qualité de l'air ambiant - Méthode pour le mesurage des Luftbeschaffenheit - Standardverfahren zur Bestimmung
concentrations en benzène - Partie 3 - Echantillonnage par von Benzolkonzentrationen - Teil 3: Automatische
pompage automatique suivi d'une chromatographie en Probenahme mit einer Pumpe mit gaschromatographischer
phase gazeuse in situ In-situ-Bestimmung
This European Standard was approved by CEN on 21 March 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14662-3:2005: E
worldwide for CEN national Members.

Contents
Foreword .3
1 Scope.4
2 Normative references .4
3 Terms and definitions.4
4 Symbols and abbreviated terms.8
5 Principles.9
6 Reagents and materials.10
7 Apparatus .11
8 Type approval.12
9 Field Operation and Ongoing Quality Control .25
10 Reports and documentation .33
Annex A (normative) Test of lack of fit.35
Annex B (informative) Calculation of uncertainty in field operation at the limit value for
individual measurements .37
Annex C (informative) An example of the results of an inter-calibration exercise.39
Annex D (informative)  Components and applications of type approved benzene monitors .42
Bibliography.44

Foreword
This European Standard (EN 14662-3:2005) has been prepared by Technical Committee CEN/TC 264
“Air quality”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2005, and conflicting national standards
shall be withdrawn at the latest by November 2005.
This document has been prepared under a mandate given to CEN by the European Commission and
the European Free Trade Association, and supports essential requirements of EU Directive
2000/69/EC and EU Directive 96/62 EC.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia,
Spain, Sweden, Switzerland and United Kingdom.
1 Scope
This part of EN 14662 is in accordance with the generic methodology selected as the basis of the
European Union Reference Method for the determination of benzene in ambient air [1] for the purpose
of comparison of measurement results with limit values with a one-year reference period.
The standard describes guidelines for measurements with, and type approval of, automated gas
chromatographs. The use of automated instruments gives this part a different structure compared to
the other parts including the procedure for selecting an appropriate automated gas chromatograph by
means of type approval tests.
Requirements for use in the field are also described.
The standard is applicable to measurements of airborne benzene vapour in the concentration range
3 3
from 0 µg/m to 50 µg/m (Standardised to 101,3 kPa and 293 K). This concentration range represents
the certification range for benzene in the type approval test.
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.
ENV 13005, Guide to the expression of uncertainty in measurement
EN ISO 14956, Air quality - Evaluation of the suitability of a measurement procedure by comparison
with a required measurement uncertainty (ISO 14956:2002)
EN ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories
(ISO/IEC 17025:1999)
ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results - Part 2:
Basic method for the determination of repeatability and reproducibility of a standard measurement
method
ISO 5725-3:1995, Accuracy (trueness and precision) of measurement methods and results - Part 3:
Intermediate measures of the precision of a standard measurement method
ISO 6142: 2001 Gas analysis – Preparation of calibration gas mixtures - Gravimetric method
ISO 6143 Gas analysis – Determination of the composition of calibration gas mixtures – Comparison
methods
ISO 6144 Gas analysis - Preparation of calibration gas mixtures - Static volumetric method
ISO 6145 (all parts) Gas analysis - Preparation of calibration gas mixtures - Dynamic volumetric
methods
3 Terms and definitions
For the purposes of this European Standard the following terms and definitions apply.
3.1
Ambient air
outdoor air in the troposphere
3.2
Ambient temperature
temperature at the sample inlet outside the monitoring station
3.3
Availability of the analyser
fraction of the total time period for which valid measuring data of the ambient air concentration is
available
3.4
Calibration
comparison of the analyser response to a known gas concentration with a known uncertainty
3.5
Carry-over (memory effect)
influence of the previous measurement due to the retention of benzene within the instrument
3.6
Certification range
concentration range for which the analyser is type approved
3.7
Combined standard uncertainty
calculation result of combining the standard uncertainties calculated from all performance
characteristics specified in this standard according to the prescribed procedure given in this standard
3.8
Designated body
body (which can be a laboratory) which has been designated for a specific task (type approval tests
and/or QA/QC activities in the field) by a competent authority in the Member States
NOTE It is recommended that the designated body is accredited for the specific task according to EN
ISO/IEC 17025
3.9
Detection limit
lowest concentration level in ambient air for which the instrument does not give a zero response
3.10
Expanded uncertainty
for the purposes of this standard, the combined uncertainty of the measurement multiplied by a factor
of 2 and so expressed with a level of confidence of 95 %
3.11
Independent measurement
individual measurement that is not influenced by a previous individual measurement
3.12
Individual measurement
measurement averaged over a time period equal to the sampling time
3.13
Influence quantity
quantity that affects the result of a measurement
3.14
Interference
response of the analyser to interferents
3.15
Interferent
single gaseous component in the sampled air, other than benzene, that affects the output signal of the
analyser
3.16
International (measurement) standard
standard recognised by an international agreement to serve internationally as the basis for assigning
values to other standards of the quantity concerned
3.17
Lack of fit
deviation of the average of a series of measurements at the same concentration from the linear
regression line
3.18
Limit value
concentration level fixed on the basis of scientific knowledge, with the aim of avoiding, preventing or
reducing harmful effects on human health, as stated in the EU legislation
3.19
Linearity
ability of a series of data to be modelled by a linear regression line
3.20
Long term drift
change in zero or span readings over the period of unattended operation
3.21
Measurand
particular quantity subject to measurement. For the purpose of this EN-standard it is benzene in air
3.22
Monitoring station
enclosure located in the field in which an automated benzene-analyser has been installed in such a
way that its performance and operation complies with the prescribed requirements
3.23
Operational range
concentration range for which the analyzer is calibrated. It shall not exceed the certification range
3.24
Parallel measurement
two measurements from different analysers, sampling from one and the same sampling manifold
starting at the same time and ending at the same time
3.25
Performance characteristic
one of the parameters assigned to equipment in order to define its performance, e.g. linearity
3.26
Performance criterion
limiting quantitative numerical value assigned to a performance characteristic, to which conformance is
tested
3.27
Repeatability (of results of measurement)
closeness of the agreement between the results of successive measurements of the same measurand
carried out under the same conditions of measurement [2]
NOTE 1 These conditions are called laboratory repeatability conditions and include:
- the same measurement procedure;
- the same analyser, used under the same conditions;
- at the same location;
- repetition over a short period of time;
- the same observer.
NOTE 2 In this EN-standard the repeatability is expressed as a value with a level of confidence of 95 %.
3.28
Response time
time interval between the instant when a stimulus is subjected to a specified abrupt change and the
instant when the response reaches and remains within specified limits around its final steady value.
NOTE For the analyzers described in this Standard, that perform measurements integrated over a certain
time period, the response time is at least one measurement cycle.
3.29
Reproducibility under field conditions
closeness of the agreement between the results of parallel measurements with two analysers in
ambient air carried out under the same conditions of measurement
NOTE 1 These conditions are called field reproducibility conditions and include:
- the same measurement procedure;
- two identical analysers, used under the same conditions;
- at the same monitoring station;
- the period of unattended operation.
NOTE 2 In this EN-standard the reproducibility under field conditions is expressed as a value with a level of
confidence of 95 %
3.30
Sampled air
ambient air that has been sampled through the sampling inlet and sampling system
3.31
Sampling inlet
entrance to the sampling system where the ambient air is collected from the atmosphere
3.32
Short term drift
change in zero or span measurement results
...