EN 14626:2005

SLOVENSKI STANDARD
01-september-2005
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Ambient air quality - Standard method for the measurement of the concentration of
carbon monoxide by nondispersive infrared spectroscopy
Luftqualität - Messverfahren zur Bestimmung der Konzentration von Kohlenmonoxid mit
nicht-dispersiver Infrarot-Photometrie
Qualité de l'air ambiant - Méthode de mesurage pour la détermination de la
concentration du monoxyde de carbone dans l'air ambiant par la méthode a
rayonnement infrarouge non dispersif
Ta slovenski standard je istoveten z: EN 14626:2005
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 14626
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2005
ICS 13.040.20
English version
Ambient air quality - Standard method for the measurement of
the concentration of carbon monoxide by nondispersive infrared
spectroscopy
Qualité de l'air ambiant - Méthode normalisée de mesurage Luftqualität - Messverfahren zur Bestimmung von
de la concentration en monoxyde de carbone par la Kohlenmonoxid in Luft mit dem NDIR-Verfahren
méthode à rayonnement infrarouge non-dispersif
This European Standard was approved by CEN on 10 December 2004.
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 14626:2005: E
worldwide for CEN national Members.

Contents
Page
Foreword.4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Symbols and abbreviated terms .10
5 Principle.13
5.1 General.13
5.2 Measuring principle.13
5.3 Type approval test .13
5.4 Field operation and quality control.14
6 Sampling equipment .14
6.1 General.14
6.2 Sampling location.14
6.3 Sample inlet and sampling line .14
6.4 Particulate filter.15
6.5 Control and regulation of sample flow rate .15
6.6 Sampling pump for the manifold.15
7 Analyser equipment .16
7.1 General.16
7.2 Interferences due to infrared absorbing gases .16
7.3 Details about analyser equipment .16
7.4 Pressure measurement .17
7.5 Flow rate indicator.17
7.6 Sampling pump for the analyser.17
8 Type approval of CO-NDIR analysers.17
8.1 General.17
8.2 Relevant performance characteristics and performance criteria .17
8.3 Design changes .19
8.4 Procedures for determination of the performance characteristics during the laboratory test .19
8.5 Determination of the performance characteristics during the field test.29
8.6 Expanded uncertainty calculation for type approval.32
9 Field operation and ongoing quality control .33
9.1 General.33
9.2 Suitability evaluation.33
9.3 Initial installation.34
9.4 Ongoing quality control .35
9.5 Calibration of the analyser.36
9.6 Checks .37
9.7 Maintenance .40
9.8 Data handling and data reports.41
10 Expression of results .41
11 Test reports and documentation.42
11.1 Type approval tests .42
11.2 Field operation .42
Annex A (normative) Test of lack of fit.43
Annex B (informative) Sampling equipment.45
Annex C (informative) Sampling on micro scale.47
Annex D (informative) Schematics of non-dispersive infrared spectrometer.48
Annex E (informative) Manifold testing equipment .50
Annex F (normative) Type approval .51
Annex G (normative) Calculation of uncertainty in field operation at the 8-hour mean limit value.73
Bibliography.86

Foreword
This document (EN 14626:2005) 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 September 2005, and conflicting national standards shall be withdrawn at the
latest by September 2005.
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 document specifies a continuous measurement method for the determination of the concentration of carbon
monoxide present in ambient air based on the non-dispersive infrared measuring principle (NDIR). This document
describes the performance characteristics and sets the relevant minimum criteria required to select an appropriate
non-dispersive infrared carbon monoxide analyser by means of type approval tests. It also includes the evaluation
of the suitability of an anayser for use in a specific fixed site so as to meet the Directives data quality requirements
and requirements during sampling, calibration and quality assurance.
The method is applicable to the determination of the mass concentration of carbon monoxide present in ambient air
3 3
in the range from 0 mg/m to 100 mg/m carbon monoxide. This concentration range represents the certification
range for the type approval test.
3 3
NOTE 1 0 mg/m to 100 mg/m of CO corresponds to 0 µmol/mol to 86 µmol/mol of CO.
The method covers the determination of ambient air concentrations of carbon monoxide in zones classified as rural
areas, urban-background areas and traffic-orientated locations.
NOTE 2 Other ranges may be used for measurement systems applied at rural locations monitoring Ecosystems.
The results are expressed in mg/m (at 293 K and 101,3 kPa).
When the standard is used for other purposes than the EU directive, the range and uncertainty requirements need
not apply.
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 14956:2002, Air quality — Evaluation of the suitability of a measurement procedure by comparison with a
required measurement uncertainty (ISO 14956:2002)
ISO 6143, Gas analysis — Comparison methods for determining and checking the composition of calibration gas
mixtures
ISO 6144, Gas analysis — Preparation of calibration gas mixtures — Static volumetric method
ISO 6145 (all parts), Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
ambient air
)
outdoor air in the troposphere excluding workplace air
3.2
ambient temperature
temperature at the sample inlet outside the monitoring station (sample temperature, outdoor temperature)
3.3
availability of the analyser
fraction of the total time period for which usually valid measuring data
...