1、BRITISH STANDARD BS EN 61207-6:1994 IEC 1207-6: 1994 Expression of performance of gas analyzers Part 6: Photometric analyzers The European Standard EN 61207-6:1994 has the status of a British Standard UDC 621.317.79:543.27:543.25:543.4BSEN61207-6:1994 This British Standard, having been prepared unde
2、r the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15 December 1994 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference PCL/1 Draft for comment 90/23869 DC ISBN 0 580 23534
3、 3 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: Austria Italy Belgium Luxembourg Denmark Netherlands Finland Norway France Po
4、rtugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date CommentsBSEN61207-6:1994 BSI 10-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 61207-6 3 National annex NA (in
5、formative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN61207-6:1994 ii BSI 10-1999 National foreword This British Standard has been prepared under the direction of the Electrotechnical Sector Board and is the English language version
6、 of EN 61207-6:1994 Expression of performance of gas analyzers Part6:Photometric analyzers, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 1207-6:1994 published by the International Electrotechnical Commission (IEC). IEC 1207-6 constitute
7、s Part 6 of the IEC 1207 series of publications under the general title Expression of performance of gas analyzers. The other Parts in the series are as follows: Part 1: General; Part 2: Oxygen in gas; Parts 3, 4 and 5: are under consideration. The following print types are used in this standard: re
8、quirements proper: in roman type; notes: in smaller roman type. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity f
9、rom legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be ind
10、icated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61207-6 June 1994 UDC 621.317.79:543.27:543.25:543.4 Descriptors: Gaseous mixtures, constituents in gaseous mixtures, gas analyzers, performance of gas analyzers, photometric gas analyzers En
11、glishversion Expression of performance of gas analyzers Part6:Photometric analyzers (IEC 1207-6:1994) Expression des qualits de fonctionnement desanalyseurs de gaz Partie 6: Analyseurs photomtriques (CEI 1207-6:1994) Angabe zum Bertriebsverhalten von Gasanalysatoren Teil 6: Fotometrische Analysatore
12、n (IEC 1207-6:1994) This European Standard was approved by CENELEC on 1994-05-15. CENELEC 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
13、and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the resp
14、onsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
15、 Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 199
16、4 Copyright reserved to CENELEC members Ref. No. EN 61207-6:1994 EEN61207-6:1994 BSI 10-1999 2 Foreword The text of document 65D(CO)2, as prepared by Sub-Committee 65D: Analyzing equipment, of IECTechnical Committee 65: Industrial-process measurement and control, was submitted to the IEC-CENELEC par
17、allel vote in September 1993. The reference document was approved by CENELEC as EN 61207-6 on 15 May 1994. The following dates were fixed: For products which have complied with the relevant national standard before 1995-05-15, as shown by the manufacturer or by a certification body, this previous st
18、andard may continue to apply for production until 2000-05-15. Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given only for information. In this standard, Annex A and Annex ZA are normative and Annex B is informative. Contents Page Foreword
19、2 Introduction 3 1 Scope and object 3 2 Normative references 3 3 Definitions 3 4 Procedure for specification 5 4.1 Specification of essential ancillary units and services 5 4.2 Additional terms related to the specification of performance 5 5 Recommended standard values and range of influence quantit
20、ies 5 6 Procedures for compliance testing 6 Annex A (normative) Techniques and systemsofphotometric analysis 8 Annex B (informative) Methods of preparation of water vapour in test gases 10 Annex ZA (normative) Other international publications quoted in this standard with the references of the releva
21、nt European publications 12 Bibliography 12 Figure A.1 Techniques of photometric analysis used for gases 8 Figure A.2 Analysis systems for gases 8 Figure A.3 Test apparatus to apply gases and water vapour to analysis systems 9 Figure A.4 Test apparatus to simulate duct conditions for in situ/across-
22、duct analyzers 10 latest date of publication of an identical national standard (dop) 1995-05-15 latest date of withdrawal of conflicting national standards (dow) 1995-05-15EN61207-6:1994 BSI 10-1999 3 Introduction Photometric analyzers utilize detectors which respond to wavelengths in the ultraviole
23、t, visible and infrared part of the electromagnetic spectrum (wavelengths 180nm to 20 4m). Within this range of wavelengths many gases have absorption/emission bands. Analyzers designed to utilize these bands employ several techniques, including sensing of absorbed radiation, and sensing of emitted
24、radiation from artificially excited molecules, and sensing of the radiation intensity/wavelength derivative. The volume of gas measured may be contained within a sample cell, this sample may or may not be conditioned, or the concentration may be directly measured within the sample gas. 1 Scope and o
25、bject This part of IEC 1207 applies to all aspects of analyzers using photometric techniques for the measurement of concentration of one or more components in a mixture of gases or vapours. It should be used in conjunction with IEC 1207-1. It applies to analyzers using non-dispersive and dispersive
26、wavelength selection and using absorption, emission, or wavelength derivative techniques. It applies to analyzers which receive either a conditioned or unconditioned sample of gas either under vacuum, at ambient pressure or pressurized. It applies to analyzers which measure gas concentrations direct
27、ly within the sample gas. The object of this part is: to specify the terminology and definitions related to the functional performance of gas analyzers, utilizing a photometric analyzer, for the continuous measurement of gas or vapour concentration in a source gas; to unify methods used in making an
28、d verifying statements on the functional performance of such analyzers; to specify what tests should be performed to determine the functional performance and how such tests should be carried out; to provide basic documents to support the application of standards of quality assurance ISO9001, ISO 900
29、2 and ISO 9003. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 1207. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parti
30、es to agreements based on this part of IEC 1207 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 654, Operating conditions for indus
31、trial-process measurement and control equipment. IEC 1207-1:1994, Expression of performance of gas analyzers Part 1: General. 3 Definitions See Figure A.1 for the relationship between types of instruments. 3.1 infrared analyzer an electro-optical instrument consisting of a single or double source of
32、 infrared radiation and one or more infrared detectors separated from the source by a measuring path wherein the specific spectral absorption of the component of interest is determined NOTE 1For the purpose of this part, the analyzer is adjusted by the manufacturer to select only the spectral band(s
33、) at which the component to be determined has its characteristic absorption, and the measuring path dimensions are appropriate for the rated range of concentration and application of the analyzer. NOTE 2Specific spectral sensitivity is obtained by a selective component such as a selective source, se
34、lective detector or selective filter, gas-filled cell or dispersive element, or any combination of these components. 3.2 ultraviolet (visible) analyzer an analyzer as defined in 3.1 but where the spectral absorption of the component determined occurs at wavelengths between 180 nm and 1 000 nm, hence
35、 the source(s), detector(s) and other optical components operate in the visible light or ultraviolet part of the electromagnetic spectrum. NOTEThe visible part of the spectrum is included in this definition for ease of reference.EN61207-6:1994 4 BSI 10-1999 3.3 dual-beam analyzer an analyzer whereby
36、 the radiation passage through the measured gas and a reference gas follows separate physical paths 3.4 single-beam analyzer an analyzer whereby the radiation follows a single path through the sample gas, and measuring and reference signals are derived from wavelength selection (see 3.5), or for a s
37、ingle-beam single-wavelength analyzer, no reference signal is generated 3.5 dual-wavelength filter-correlation analyzer an analyzer where measuring and reference signals are derived by optical filter wavelength selection within and outside an absorption band respectively. These two signals are proce
38、ssed to derive a concentration value 3.6 gas correlation analyzer an analyzer where measuring and reference signals are derived by utilizing a cell filled with the gas to be measured to absorb selectively radiation corresponding to the fine structure of the absorption line spectrum of that gas. The
39、two signals are processed to derive a concentration value NOTEThe gas-filled component may be part of the detector. 3.7 wavelength derivative analyzer an analyzer which measures gas-component concentrations using wavelength modulation of the radiation, and thereby uses the first derivative or second
40、 derivative of intensity versus wavelength to measure the shape of the absorption band 3.8 fluorescence analyzer an analyzer which measures gas-component concentrations by detecting the emission of radiation from excited molecules in relaxation to the ground state the components that cause excitatio
41、n are part of the analyzer NOTE 1Fluorescence can occur when molecules absorb short-wavelength radiation, an electron is excited to a higher energy level, and subsequently relaxes with emission of radiation. NOTE 2Chemiluminescence analyzers utilize a chemical reaction to produce molecules in an exc
42、ited state. 3.9 extractive analyzer an analyzer which receives a continuous stream of gas withdrawn from a process by a sample handling system 3.10 sample-handling system a system which connects one or more process analyzers with the source fluid and the disposal points NOTEThe performance of this s
43、ystem is not dealt with in this part except for dilution sampling systems. 3.11 dilution sampling system a system which samples process fluid and adds a diluent to the sample stream prior to measurement NOTEThis type of system generally applies calibration gas prior to the dilution point and hence t
44、he dilution system is treated as part of an in situ analyzer for the purposes of this part. 3.12 in situ analyzer an analyzer where the volume of gas sensed, that is within the measuring path for a photometric analyzer, is situated within the process source fluid NOTEAn in situ analyzer will contain
45、 a fixed-length measuring cell within the duct and its calibration is not affected by the dimensions of the duct. 3.13 across-duct analyzer an analyzer where the measuring path is formed by the entire width of the process duct NOTEThe radiation source and detector can be mounted on opposite sides of
46、 the duct, or both can be mounted on the same side and a retroreflector employed. Where the retroreflector is within the duct, the analyzer is of the in situ type. 3.14 conditioned sample a continuous stream of gas withdrawn from the source gas and filtered, cooled, and dried to within specified lim
47、its before application to a sampling analyzer 3.15 heated sample a continuous stream of gas withdrawn from the source gas, which may or may not be filtered but is maintained at a temperature above its dew-point, including within the analyzerEN61207-6:1994 BSI 10-1999 5 3.16 opacity the absorption of
48、 radiation, at the wavelengths used for measurement, by components of the sample gas, other than the component to be measured 3.17 essential ancillary units essential ancillary units are those without which the analyzer will not operate, e.g. ancillary electronic units processing sensor signals to p
49、roduce the reading, dilution sampling system, air purge or other optical cleaning system, automatic calibration system, temperature or pressure compensation system 4 Procedure for specification The procedures for specification are detailed in IEC1207-1. This covers: specification of values and ranges; operation and storage requirements; limits of errors; recommended standard values and ranges of influence quantities (see IEC 654). In this part of IEC 1207, specifications of ranges for ancillary equipment are given. Additional
