BS EN 14625-2005 环境空气质量.用紫外线光度测量法测量臭氧浓度的标准方法.pdf
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1、BRITISH STANDARD BS EN 14625:2005 Ambient air quality Standard method for the measurement of the concentration of ozone by ultraviolet photometry The European Standard EN 14625:2005 has the status of a British Standard ICS 13.040.20 BS EN 14625:2005 This British Standard was published under the auth
2、ority of the Standards Policy and Strategy Committee on 29 March 2005 BSI 29 March 2005 ISBN 0 580 45719 2 National foreword This British Standard is the official English language version of EN 14625:2005. It supersedes BS ISO 13964:1998 which is withdrawn. The UK participation in its preparation wa
3、s entrusted by Technical Committee EH/2, Air quality, to Subcommittee EH/2/3, Ambient atmospheres, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement internation
4、al or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to
5、 include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any
6、enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 87 and a b
7、ack cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments W - - - 7 7 -7 - 7 90 % a Span level is 70 % to 80% of the certification range b Performance criterion is set both at zero and span le
8、vel c an H2O-concentratration of 19 mmol/mol is about 80 %RH at 20 C and 101,3 kPa d if relevant NOTE nmol/mol = ppb 8.3 Design changes The manufacturer shall report any (design) change of the previous type approved monitor to the responsible authority. The underlying idea of the (design) change, as
9、 well as the expected consequences with respect to the performance characteristics as stated in Table 1 shall be reported by the manufacturer. The responsible authority shall decide whether or not new tests are necessary. Excluded from reporting obligation are: material of the instrument frame (hous
10、ing); electronic connectors; bolts, nuts, cable binders and other fixing materials. 8.4 Procedures for determination of the performance characteristics during the laboratory test 8.4.1 General A designated body shall perform the determination of the performance characteristics in the laboratory as a
11、 part of the type approval test. The quality of the materials and equipment used in the described test procedures shall be in accordance with the requirements given in this document. The tests shall be performed on at least two analysers in the laboratory test. EN 14625:2005 (E) 21 8.4.2 Test condit
12、ions 8.4.2.1 General Before operating the analyser, the operating instructions of the manufacturer shall be followed particularly with regard to the set-up of equipment and the quality and quantity of the consumable products necessary. The analyser should be allowed to warm up during the time specif
13、ied by the manufacturer before undertaking any tests. If the warm-up time is not specified, a minimum of 4 h is recommended. When applying test gases to the analyser, the test gas system shall be operated sufficiently long before starting the tests in order to stabilise the concentrations applied to
14、 the analyser. Most analyser systems are able to give an output signal as a moving average over an adjustable period of time and some systems automatically change this integration time as a function of the frequency of the fluctuations in concentration of the detected pollutant. These options are ty
15、pically used in order to smooth output data. It needs to be demonstrated that the set value for the averaging time or the use of an active filter will not influence the result of the averaging test and response time test. During laboratory and field tests for the type approval the settings of the mo
16、nitor shall be as the manufacturer requires. All settings shall be noted down in the test report. 8.4.2.2 Parameters During the test for each individual performance characteristic, the values of the following parameters shall be stable within the specified range given in Table 2. Table 2 Set points
17、and stability of test parameters Parameter Set points Stability Sample gas pressure Manufacturers specification (Except for the sample gas pressure test, see 8.4.7) 0,2 kPa Sample gas temperature 20 C to 23 C (except for the sample gas temperature test, see 8.4.8) 2 C Surrounding air temperature 20
18、C to 23 C (except for the temperature of the surrounding air test, see 8.4.9) 2 C Electrical voltage a At nominal line voltage and within manufacturers specifications (except for the voltage dependence test, see 8.4.10) 1 % Sample flow to the analyser Manufacturers specification 1 % a For an analyse
19、r operating on direct current the type approval test of voltage variation shall be carried out over the range of 10 % of the nominal voltage. 8.4.2.3 Calibration gases and method For the determination of the various performance characteristics, test gases (air containing a certain O3 concentration)
20、traceable to national standards shall be used unless otherwise stated in this document. Various methods for the generation of test gases are given in Table 3. EN 14625:2005 (E) 22 Table 3 Methods for preparation of test gases and calibration Method Description Traceability/ Standard to be used Gener
21、ation of an ozone calibration gas Preparation by means of an ozone generator ISO 13964:1998, 5.2 point b Calibration Using a primary UV reference photometer ISO 13964:1998, 6.2/6.2.1/6.2.2 and Clause 7/7.1 The uncertainties in zero and span gases used for the laboratory and field tests shall be prov
22、en to be insignificant. Possible contamination of zero and span gas shall not significantly influence the results of the laboratory tests. Therefore the test gases and zero gas shall meet the following specifications: Maximum permitted uncertainties in the concentration of gases used for laboratory
23、tests: 3 %. Specification of the purity of zero gas and the air feeding the ozon generator (expressed as absolute value) are given in Table 4. Table 4 Specification for purity of zero air and the air feeding the ozon generator Pollutant Concentration xylene 6,0 % EN 14625:2005 (E) 37 Calibration, ch
24、ecks and maintenance Clause Frequency Action criteria e laboratory or in field) Annex B installation and after repair; further frequency depending on the result of test of the measured value Testing sample manifold - influence of pressure drop induced by the manifold pump - sample collection efficie
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- BS EN 14625-2005 环境空气质量.用紫外线光度测量法测量臭氧浓度的标准方法 14625 2005 环境 空气质量 紫外线 光度 测量 臭氧 浓度 标准 方法
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