1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 14625:2012Ambient air Standardmethod for the measurementof the concentration of ozoneby ultraviolet photometryBS EN 14625:2012 BRITISH STANDARDNational forewordThis British
2、 Standard is the UK implementation of EN 14625:2012. Itsupersedes BS EN 14625:2005 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EH/2/3, Ambient atmospheres.A list of organizations represented on this committee can beobtained on request to its secreta
3、ry.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 69299 4ICS 13.040.20Compliance with a British Standard cannot conf
4、er immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 September 2012.Amendments issued since publicationDate Text affectedBS EN 14625:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14625 August 2012 ICS
5、 13.040.20 Supersedes EN 14625:2005English Version Ambient air - Standard method for the measurement of the concentration of ozone by ultraviolet photometry Air ambiant - Mthode normalise de mesurage de la concentration en ozone par photomtrie U.V. Luftqualitt - Messverfahren zur Bestimmung der Konz
6、entration 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 alterati
7、on. 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
8、 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,
9、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 STANDARDI
10、ZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR 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: EBS EN 14625:2012EN 14625:2012 (E) 2 Content
11、s Contents 2Foreword 41 Scope 52 Normative references 63 Terms and definitions . 64 Abbreviated terms . 115 Principle 115.1 General 115.2 Measuring principle . 115.3 Type approval test . 125.4 Field operation and quality control 126 Sampling . 126.1 General 126.2 Sampling location 136.3 Sampling sys
12、tem . 136.4 Control and regulation of sample flow rate 146.5 Sampling pump for the manifold 147 Analyser equipment 147.1 General 147.2 Ultraviolet absorption cell . 157.3 Ultraviolet source lamp . 157.4 UV detector . 157.5 Ozone-specific scrubber . 157.6 Switching valve 157.7 Temperature indicator .
13、 157.8 Pressure indicator . 157.9 Flow rate indicator . 167.10 Sampling pump for the analyser 167.11 Internal ozone span source 167.12 Particle filter . 168 Type approval of ultraviolet photometric ozone analysers . 168.1 General 168.2 Relevant performance characteristics and performance criteria .
14、178.3 Design change . 18BS EN 14625:2012EN 14625:2012 (E) 3 8.4 Procedures for determination of the performance characteristics during the laboratory test . 198.5 Determination of the performance characteristics during the field test 308.6 Type approval and uncertainty calculation. 339 Field operati
15、on and ongoing quality control 349.1 General 349.2 Suitability evaluation . 349.3 Initial installation . 369.4 Ongoing quality assurance/quality control. 379.5 Calibration of the analyser 389.6 Checks 409.7 Maintenance . 449.8 Data handling and data reports 449.9 Measurement uncertainty . 4510 Expre
16、ssion of results 4511 Test reports and documentation 4511.1 Type approval test . 4511.2 Field operation . 47Annex A (normative) Test of lack of fit . 48Annex B (informative) Sampling equipment. 50Annex C (informative) Ultraviolet photometric analyser . 52Annex D (informative) Manifold testing equipm
17、ent . 54Annex E (normative) Type approval 56Annex F (informative) Calculation of uncertainty in field operation at the hourly alert threshold value . 75Annex G (informative) Calculation of uncertainty in field operation at the 8-hour target value . 83Annex H (informative) Significant technical chang
18、es . 93Bibliography 94BS EN 14625:2012EN 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
19、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
20、 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 t
21、he 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, Nether
22、lands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 14625:2012EN 14625:2012 (E) 5 1 Scope This European Standard specifies a continuous measurement method for the determination of the concentrations of ozone present in ambien
23、t 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 su
24、itability 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 o
25、zone present in ambient air up to 500 g/m3. 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
26、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 g/m3(at 20 C and 101,3 kPa). NOTE 3 500 g/m3
27、of O3corresponds to 250 nmol/mol of O3at 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
28、 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
29、-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 c
30、ontain 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. BS
31、 EN 14625:2012EN 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 refere
32、nced 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 manufacturers quality management system and pos
33、t 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
34、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 (I
35、SO/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 se
36、t 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 (som
37、etimes 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
38、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 define
39、d 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 BS EN 14625:2012EN 14625:2012 (E) 7 3.4 analyser measuring system that provides an output signal which is a function of the concen
40、tration, 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 spe
41、cified 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 obt
42、aining 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 associat
43、ed 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 calibr
44、ation. 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 successive adjustment (if needed) of the
45、 analyser. 3.7 certification range concentration range for which the analyser is type-approved 3.8 check verification that the analyser is still operating within specified performance limits 3.9 combined standard uncertainty standard uncertainty of the result of a measurement when that result is obt
46、ained 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 co-variances of these other quantities weighted according to how the measurement result varies with changes in these quantities SOURCE: ENV 13005:1999 3.10 cov
47、erage factor numerical factor used as a multiplier of the combined standard uncertainty in order to obtain an expanded uncertainty SOURCE: ENV 13005:1999 3.11 designated body body which has been designated for a specific task (type approval tests and/or QA/QC activities in the field) by the competen
48、t authority in the Member States BS EN 14625:2012EN 14625:2012 (E) 8 3.12 detection limit smallest concentration of a measurand that can be reliably detected by a specific measurement process Note 1 to entry: The detection limit is calculated as 3,3 x (sz/B) where szis the standard deviation of analyser response at zero measurand concentration (see 8.4.5) and B is the slope of the calibration function 3. 3.13 expanded uncertainty quantity defining an interval about the result of a measurement that may be expected to encompass a large fraction of the distribution of values that could reason
