BS EN 14625-2012

raising standards worldwide ™ NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS EN 14625:2012 Ambient air — Standard method for the measurement of the concentration of ozone by ultraviolet photometry Licensed Copy: Mr. Universiti Teknologi Malaysia User, Universiti Teknologi Malaysia, 16/11/2012 21:43, Uncontrolled Copy, (c) The British Standards Institution 2012BS EN 14625:2012 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 14625:2012. It supersedes BS EN 14625:2005 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee EH/2/3, Ambient atmospheres. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. © The British Standards Institution 2012. Published by BSI Standards Limited 2012 ISBN 978 0 580 69299 4 ICS 13.040.20 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2012. Amendments issued since publication Date Text affected Licensed Copy: Mr. Universiti Teknologi Malaysia User, Universiti Teknologi Malaysia, 16/11/2012 21:43, Uncontrolled Copy, (c) The British Standards Institution 2012BS EN 14625:2012EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 14625 August 2012 ICS 13.040.20 Supersedes EN 14625:2005 English Version Ambient air - Standard method for the measurement of the concentration of ozone by ultraviolet photometry Air ambiant - Méthode normalisée de mesurage de la concentration en ozone par photométrie U.V. Luftqualität - Messverfahren zur Bestimmung der Konzentration von Ozon mit Ultraviolett-Photometrie This European Standard was approved by CEN on 10 May 2012. 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14625:2012: E Licensed Copy: Mr. Universiti Teknologi Malaysia User, Universiti Teknologi Malaysia, 16/11/2012 21:43, Uncontrolled Copy, (c) The British Standards Institution 2012BS EN 14625:2012 EN 14625:2012 (E) 2 Contents Contents 2 Foreword 4 1 Scope 5 2 Normative references 6 3 Terms and definitions . 6 4 Abbreviated terms . 11 5 Principle 11 5.1 General 11 5.2 Measuring principle . 11 5.3 Type approval test . 12 5.4 Field operation and quality control 12 6 Sampling . 12 6.1 General 12 6.2 Sampling location 13 6.3 Sampling system . 13 6.4 Control and regulation of sample flow rate 14 6.5 Sampling pump for the manifold 14 7 Analyser equipment 14 7.1 General 14 7.2 Ultraviolet absorption cell . 15 7.3 Ultraviolet source lamp . 15 7.4 UV detector . 15 7.5 Ozone-specific scrubber . 15 7.6 Switching valve 15 7.7 Temperature indicator . 15 7.8 Pressure indicator . 15 7.9 Flow rate indicator . 16 7.10 Sampling pump for the analyser 16 7.11 Internal ozone span source 16 7.12 Particle filter . 16 8 Type approval of ultraviolet photometric ozone analysers . 16 8.1 General 16 8.2 Relevant performance characteristics and performance criteria . 17 8.3 Design change . 18 Licensed Copy: Mr. Universiti Teknologi Malaysia User, Universiti Teknologi Malaysia, 16/11/2012 21:43, Uncontrolled Copy, (c) The British Standards Institution 2012BS EN 14625:2012 EN 14625:2012 (E) 3 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 30 8.6 Type approval and uncertainty calculation. 33 9 Field operation and ongoing quality control 34 9.1 General 34 9.2 Suitability evaluation . 34 9.3 Initial installation . 36 9.4 Ongoing quality assurance/quality control. 37 9.5 Calibration of the analyser 38 9.6 Checks 40 9.7 Maintenance . 44 9.8 Data handling and data reports 44 9.9 Measurement uncertainty . 45 10 Expression of results 45 11 Test reports and documentation 45 11.1 Type approval test . 45 11.2 Field operation . 47 Annex A (normative) Test of lack of fit . 48 Annex B (informative) Sampling equipment. 50 Annex C (informative) Ultraviolet photometric analyser . 52 Annex D (informative) Manifold testing equipment . 54 Annex E (normative) Type approval 56 Annex F (informative) Calculation of uncertainty in field operation at the hourly alert threshold value . 75 Annex G (informative) Calculation of uncertainty in field operation at the 8-hour target value . 83 Annex H (informative) Significant technical changes . 93 Bibliography 94 Licensed Copy: Mr. Universiti Teknologi Malaysia User, Universiti Teknologi Malaysia, 16/11/2012 21:43, Uncontrolled Copy, (c) The British Standards Institution 2012BS EN 14625:2012 EN 14625:2012 (E) 4 Foreword This document (EN 14625:2012) 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 February 2013, and conflicting national standards shall be withdrawn at the latest by February 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14625:2005. The technical changes made since EN 14625:2005 are listed in Annex H of this European Standard. According to the CEN/CENELEC Internal Regulations, the national standards organisations 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Licensed Copy: Mr. Universiti Teknologi Malaysia User, Universiti Teknologi Malaysia, 16/11/2012 21:43, Uncontrolled Copy, (c) The British Standards Institution 2012BS EN 14625:2012 EN 14625:2012 (E) 5 1 Scope This European Standard specifies a continuous measurement method for the determination of the concentrations of ozone present in ambient air based on the ultraviolet photometric measuring principle. This standard describes the performance characteristics and sets the relevant minimum criteria required to select an appropriate ultraviolet photometric analyser by means of type approval tests. It also includes the evaluation of the suitability of an analyser for use in a specific fixed site so as to meet the data quality requirements as specified in Annex I of Directive 2008/50/EC [1] and requirements during sampling, calibration and quality assurance for use. The method is applicable to the determination of the concentration of ozone present in ambient air up to 500 µg/m 3 . This concentration range represents the certification range for ozone for the type approval test. NOTE 1 Other ranges may be used for measurement systems applied at rural locations monitoring ecosystems. NOTE 2 When the standard is used for other purposes than Directive 2008/50/EC, the ranges and uncertainty requirements may not apply. The method covers the determination of ambient air concentrations of ozone in zones classified as rural areas, urban and urban-background areas. The results are expressed in µg/m 3(at 20 °C and 101,3 kPa). NOTE 3 500 µg/m 3of O 3 corresponds to 250 nmol/mol of O 3 at 20 °C and 101,3 kPa. This standard contains information for different groups of users. Clauses 5 to 7 and Annexes B and C contain general information about the principles of ozone measurement by ultraviolet photometric analyser and sampling equipment. Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type-approval testing of ozone analysers. These sections contain information about:  type-approval test conditions, test procedures and test requirements;  analyser performance requirements;  evaluation of the type-approval test results;  evaluation of the uncertainty of the measurement results of the ozone analyser based on the type-approval test results. Clauses 9 to 11 and Annexes F and G are directed towards monitoring networks performing the practical measurements of ozone in ambient air. These sections contain information about:  initial installation of the analyser in the monitoring network and acceptance testing;  ongoing quality assurance/quality control;  calculation and reporting of measurement results;  evaluation of the uncertainty of measurement results under practical monitoring conditions. Licensed Copy: Mr. Universiti Teknologi Malaysia User, Universiti Teknologi Malaysia, 16/11/2012 21:43, Uncontrolled Copy, (c) The British Standards Institution 2012BS EN 14625:2012 EN 14625:2012 (E) 6 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 15267-1, Air quality — Certification of automated measuring systems — Part 1: General principles EN 15267-2, Air quality — Certification of automated measuring systems — Part 2: Initial assessment of the AMS manufacturer’s quality management system and post certification surveillance for the manufacturing process EN ISO 6145-6, Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 6: Critical orifices (ISO 6145-6) EN ISO 6145-7, Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 7: Thermal mass-flow controllers (ISO 6145-7) EN ISO 14956, Air quality — Evaluation of the suitability of a measurement procedure by comparison with a required measurement uncertainty (ISO 14956) EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025) ENV 13005:1999, Guide to the expression of uncertainty in measurement ISO 13964:1998, Air quality — Determination of ozone in ambient air — Ultraviolet photometric method 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 adjustment set of operations carried out on a measuring system so that it provides prescribed indications corresponding to given values of a quantity to be measured Note 1 to entry Types of adjustment of a measuring system include zero adjustment of a measuring system, offset adjustment, and span adjustment (sometimes called gain adjustment). Note 2 to entry Adjustment of a measuring system should not be confused with calibration, which is a prerequisite for adjustment. [SOURCE: JCGM 200:2012 (VIM) [2]] Note 3 to entry In the context of this standard, adjustment is performed on measurement data rather than on the analyser. 3.2 alert threshold level beyond which there is a risk to human health from brief exposure for the population as a whole and at which immediate steps are to be taken by the Member States [SOURCE: 2008/50/EC [1]] 3.3 ambient air outdoor air in the troposphere, excluding workplaces as defined by Directive 89/654/EEC, where provisions concerning health and safety at work apply and to which members of the public do not have regular access [SOURCE: 2008/50/EC [1]] Licensed Copy: Mr. Universiti Teknologi Malaysia User, Universiti Teknologi Malaysia, 16/11/2012 21:43, Uncontrolled Copy, (c) The British Standards Institution 2012BS EN 14625:2012 EN 14625:2012 (E) 7 3.4 analyser measuring system that provides an output signal which is a function of the concentration, partial pressure, flow or temperature of one or more components of a gas mixture 3.5 availability of the analyser fraction of the total time period for which usually valid measuring data of the ambient air concentration is available from an analyser 3.6 calibration operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties and, in a second step, uses this information to establish a relation for obtaining a measurement result from an indication Note 1 to entry: A calibration may be expressed by a statement, calibration function, calibration diagram, calibration curve, or calibration table. In some cases, it may consist of an additive or multiplicative correction of the indication with associated measurement uncertainty. Note 2 to entry: Calibration should not be confused with adjustment of a measuring system, often mistakenly called “self- calibration”, nor with verification of a calibration. Note 3 to entry: Often, the first step alone in the above definition is perceived as being calibration. [SOURCE: JCGM 200:2008 (VIM) [2]] Note 4 to entry: In the context of this standard, calibration is a comparison of the analyser response to a known gas concentration with a known uncertainty when the information obtained from the comparison is used for the succes