1、BRITISH STANDARD BS5849:1980 IEC528:1975 Method of Expression of performance of air quality infra-red analysers IEC title: Expression of performance of air quality infra-red analyzers UDC551.510.41:543.422.4:621.384.3:621.317.39:681.785.423.3.004.15BS5849:1980 This British Standard, having been prep
2、ared under the directionof the Electronic Equipment Standards Committee,was published underthe authority of the Executive Board and comes into effect on 31January1980 BSI11-1999 The following BSI references relate to the work on this standard: Committee reference EEL/8 Draft for comment79/20126 DC I
3、SBN 0 580 11111 3 Cooperating organizations The Electronic Equipment Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: British Broadcasting Corporation Briti
4、sh Electrical and Allied Manufacturers Association (BEAMA) British Radio Equipment Manufacturers Association Cable and Wireless Limited Cable Television Association of Great Britain Electrical, Electronic, Telecommunications and Plumbing Union Electricity Supply Industry in England and Wales* Electr
5、onic Components Industry Federation Electronic Engineering Association* Institution of Electronic and Radio Engineers* Ministry of Defence* Post Office* Post Office Engineering Union Scientific Instrument Manufacturers Association* The organizations marked with an asterisk in the above list, togethe
6、r with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Industrial Measuring and Control Apparatus Manufacturers Association Department of Industry (British Calibration Service) Department of Industry (National Physical Labora
7、tory) Individual experts Amendments issued since publication Amd. No. Date of issue CommentsBS5849:1980 BSI 11-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii 1 General 1 1.1 Scope 1 1.2 Object 1 2 Definitions 1 2.1 Non-dispersive infra-red analyzer 1 2.2 Calib
8、ration gas 1 2.3 Performance characteristic 2 2.4 Influence quantity 2 2.5 Values related to quantities 2 2.6 Terms related to the specification of performance 2 2.7 Terms related to conditions of operation, transport and storage 4 3 Procedure for statement 4 4 Recommended standard values and ranges
9、 of influence quantities 6 4.1 Climatic conditions 6 4.2 Mechanical conditions 8 4.3 Mains supply conditions 9 5 Verification of values 9 Index of definitions 13 Publications referred to Inside back coverBS5849:1980 ii BSI 11-1999 National foreword This British Standard, published under the directio
10、n of the Electronic Equipment Standards Committee, is identical with IEC Publication528 “Expression of performance of air quality infra-red analyzers” published in1975 by the International Electrotechnical Commission (IEC). Terminology and conventions. The text of the International Standard has been
11、 approved as suitable for publication, without deviation, as a BritishStandard. Some terminology and certain conventions are not identical with those used in British Standards. In British Standards it is current practice to use the spelling “analysers” for “analyzers”. Scope Clause1 (General) of the
12、 International Standard is not presented in the way that is customary for the scope clause of a British Standard. Clause1 should be read as the following, which makes no change in the technical meaning and is essentially a re-arrangement of the existing text. “This standard specifies the terminology
13、 and definitions related to the functional performance of non-dispersive infra-red analysers used for the continuous determination of certain aspects of air quality by measuring gaseous constituents either in ambient or confined atmospheres or in gaseous streams entering the ambient air; it unifies
14、the methods used in making and verifying statements on the functional performance of such analysers; and it specifies what tests should be performed to determine the functional performance and how such tests should be carried out. It is applicable to infra-red analysers for installation either indoo
15、rs or outdoors. It is applicable to the complete analyser as an integral analytical unit, including all optical, mechanical, electrical and electronic portions and, for the purpose of this standard, any regulated power supply provided with the analyser or specified by the manufacturer is considered
16、part of the analyser, whether it is integral with the analyser or housed separately. This standard does not apply to the required sample-handling systems or other accessories such as recorders, analogue-to-digital converters or data acquisition systems used in conjunction with the analyser. Safety r
17、equirements are specified in IEC Publication348, “Safety requirements for electronic measuring apparatus”. This standard is in accordance with the general principles set out in IEC Publication359, “Expression of the functional performance of electronic measuring equipment”. Cross-references Internat
18、ional Standard a Corresponding British Standard IEC348:1978 BS4743:1979 Safety requirements for electronic measuring apparatus (Identical) IEC359:1971 BS4889:1973 Method for specifying the performance of electronic measuring equipment (Technically equivalent) IEC381:1971 BS3586:1970 Analogue direct
19、current signals for telemetry and control (Related) a Undated in the text.BS5849:1980 BSI 11-1999 iii 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 Standar
20、d does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi to iv, pages1to14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. T
21、his will be indicated in the amendment table on the inside front cover.iv blankBS5849:1980 BSI 11-1999 1 1 General 1.1 Scope 1.1.1 This standard applies to non-dispersive infra-red analyzers used for the continuous determination of certain aspects of air quality by measuring gaseous constituents eit
22、her in ambient or confined atmospheres or in gaseous streams entering the ambient air. 1.1.2 It applies to infra-red analyzers specified for installation either indoors or outdoors. 1.1.3 It applies to the complete analyzer as an integral analytical unit, including all optical, mechanical, electrica
23、l and electronic portions. For the purpose of this standard, any regulated power supply, provided with the analyzer or specified by the manufacturer, is considered part of the analyzer whether it is integral with the analyzer or housed separately. 1.1.4 It does not apply to the required sample handl
24、ing systems or other accessories such as recorders, analogue-to-digital converters or data acquisition systems, used in conjunction with the analyzer. 1.1.5 Safety requirements are dealt with in IEC Publication348, Safety Requirements for Electronic Measuring Apparatus. 1.1.6 This standard is in acc
25、ordance with the general principles set out in IEC Publication359, Expression of the Functional Performance of Electronic Measuring Equipment. 1.2 Object This standard is intended: to specify the terminology and definitions related to the functional performance of non-dispersive infra-red analyzers
26、used for the continuous determination of certain aspects of air quality by measuring gaseous constituents either in ambient or confined atmospheres or in gaseous streams entering the ambient air; to unify methods used in making and verifying statements on the functional performance of such analyzers
27、; to specify what tests should be performed to determine the functional performance and how such tests should be carried out. 2 Definitions The following definitions apply for the purpose of this standard: 2.1 non-dispersive infra-red analyzer an electro-optical spectrophotometric instrument with no
28、 spectral dispersion component, consisting of a single or double source of infra-red radiation and one or more infra-red detectors separated by an optical cell or cells through one or more of which the sample flows, whereby the specific spectral absorption of the component of interest is determined
29、NOTE 1For the purpose of this standard, the analyzer is adjusted by the manufacturer to select only the spectral band(s) at which the component to be determined has its characteristic absorption, and the sample cell length is appropriate for the rated range of concentration. NOTE 2Specific spectral
30、sensitivity is obtained by a selective component such as a selective source, selective detector or selective filter, or any combination of these components. 2.2 calibration gas a mixture of known concentration of the component to be determined or a suitable simulant for the component to be determine
31、d in air or another suitable carrier gas, used for periodic calibration of the infra-red analyzer, and for various performance tests NOTE 1For the purpose of this standard, concentration means the mass or the volume of the component to be determined in a given volume of calibration gas. Different un
32、its may be used, but the manufacturer shall state exactly what is meant.BS5849:1980 2 BSI 11-1999 NOTE 2For the purpose of this standard, the concentrations of these gases represent the conventionally true values 1) (see Sub-clause2.6.2.1) against which indicated values are compared. Therefore, the
33、values of the calibration gases should be traceable to standards agreed upon by the manufacturer and the user or to national standards, and the uncertainty of the conventionally true values shall be stated. 2.3 performance characteristic one of the quantities assigned to an apparatus in order to def
34、ine by values, tolerances, ranges, etc., the performance of the apparatus 2.4 influence quantity any quantity, generally external to an apparatus, which may affect the performance of the apparatus 2.5 Values related to quantities 2.5.1 rated value the value (or one of the values) of a quantity to be
35、 measured, observed, supplied or set, which the manufacturer has assigned to the apparatus 2.5.2 rated range the range of a quantity to be measured, observed, supplied or set, which the manufacturer has assigned to the apparatus 2.5.3 effective range that part of the rated range where measurements c
36、an be made within the stated limits of error 2.6 Terms related to the specification of performance 2.6.1 performance the degree to which the intended functions of an apparatus are accomplished 2.6.2 Error 2.6.2.1 absolute error the error expressed algebraically, in the unit of the measured quantity
37、for measuring apparatus, the error is the indicated value of the measured quantity minus its true value NOTEThe true value of a quantity is the value that would be measured by a measuring process having no error. In practice, since this true value cannot be determined by measurement, a conventionall
38、y true value, approaching the true value as closely as necessary (having regard to the error to be determined), is used in place of the true value. This value should be traced to standards agreed upon by the manufacturer and the user, or to national standards. In both cases, the uncertainty of the c
39、onventionally true value shall be stated. 2.6.2.2 relative error the ratio of the absolute error to a stated value 2.6.2.3 percentage error the relative error expressed as a percentage, such as percent of full scale (the maximum value of the effective range), percent of the indicated or preset value
40、 or of the rated value 2.6.2.4 fiducial value a value to which reference is made in order to specify the percentage error, e.g.the upper limit of the effective range, or another clearly stated value 1) This definition and related terms are given in IEC Publication359.BS5849:1980 BSI 11-1999 3 2.6.3
41、intrinsic error the error determined under reference conditions 2.6.4 operating error the error determined under rated operating conditions 2.6.5 influence error the error determined when one influence quantity assumes any value within its rated range of use (or an influencing characteristic assumes
42、 any value within its effective range), all others being at reference conditions 2.6.6 linearity error the maximum deviation between actual analyzer readings and the readings predicted by a linear function of the measured quantity which includes the indicated values at the upper and lower limits of
43、the effective range 2.6.7 interference error the error caused by interfering gases and vapours being present in the sample NOTEThis is an influence error and other influence errors are dealt with below. 2.6.8 limits of error the maximum values of error assigned by the manufacturer to a measured quan
44、tity of an apparatus operating under specified conditions 2.6.9 repeatability the deviation between repeated measurements made in rapid succession at the same concentration of the component to be determined, under constant environmental conditions and rated sample conditions 2.6.10 zero drift the sh
45、ift in reading for zero calibration gas (see Sub-clause5.2) over a stated period of time 2.6.11 span drift (drift of the limits of the effective range) the shift in span over a stated period of time 2.6.12 operating period the maximum time interval within which the limits of operating error are not
46、exceeded, without adjustment by external means 2.6.13 output fluctuation deviations from a mean output not caused by variation in the concentration of the component to be determined or by a change in any influence quantity 2.6.14 minimum detectable concentration the concentration which corresponds t
47、o twice the output fluctuation level when the concentration of the component to be determined is zeroBS5849:1980 4 BSI 11-1999 2.6.15 delay time the time interval from the instant a step change occurs in the concentration of the component to be determined at the analyzer inlet, to the instant when t
48、he change in the indicated value passes10% of its steady-state amplitude, with the sample flow kept at its rated value 2.6.16 rise (fall) time the time interval within which the indicated value passes from10% to90% (from90% to10%) of its steady-state amplitude after a step increase (decrease) in the
49、 concentration of the component to be determined at the analyzer inlet, with the sample flow kept at its rated value 2.6.17 warm-up time the time interval after switching on the analyzer under specified conditions, until the zero and span drifts are within specifications 2.7 Terms related to conditions of operation, transport and storage 2.7.1 reference conditions a set of values with tolerances, or of restricted ranges of influence quantities, specified for making comparison and calibration tests 2.7.2 rated range of use (of influence quantities) the range of value
