1、BRITISH STANDARD BS 4737-3.12: 1978 Reprinted, incorporating Amendment No. 1 Specification for Intruder alarm systems in buildings Part 3: Requirements for detection devices Section 3.12 Beam interruption detectors UDC 696.6:654.924.32:535.2BS4737-3.12:1978 This British Standard, having been prepare
2、d under the direction of the Electronic Equipment Standards Committee, was published under the authority of the Executive Board on 30 November 1978 BSI 12-1998 First published April 1971 First revision November 1978 The following BSI references relate to the work on this standard: Committee referenc
3、e EEL/27 Draft for comment 74/25543 DC ISBN 0 580 10365 X 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
4、: British Broadcasting Corporation British Electrical and Allied Manufacturers Association British Radio Equipment Manufacturers Association Cable Television Association of Great Britain Department of Prices and Consumer Protection Electrical, Electronic, Telecommunication and Plumbing Union Electri
5、city Supply Industry in England and Wales Electronic Components Board Electronic Engineering Association* Engineering Equipment Users Association Institution of Electronic and Radio Engineers Post Office* Radio and Electronic Component Manufacturers Federation Scientific Instrument Manufacturers Ass
6、ociation The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Burglary Insurance Surveyors Association of Chief Police Officers British Insurance As
7、sociation British Railways Board British Security Industry Association Department of the Environment Home Office Independent Burglar Alarm Association Lloyds Syndicates Survey Department Metropolitan Police Ministry of Defence National Supervisory Council for Intruder Alarms Telecommunication Engine
8、ering and Manufacturing Association The Committee of London Clearing Bankers on behalf of the Committee of Scottish Clearing Bankers, Co-operative Bank, Central Trustee Savings Bank and Yorkshire Bank Amendments issued since publication Amd. No. Date of issue Comments 3256 March 1980 Clause 11 delet
9、edBS4737-3.12:1978 BSI 12-1998 i Contents Page Foreword ii 1 Scope 1 2 References 1 3 Definition 1 4 Range and beam angle requirements 1 5 Signal processing 1 6 Modulation 1 7 Power supply 1 8 Environment 1 9 Interference 1 10 Anti-tamper device 1 Standards publications referred to Inside back cover
10、BS4737-3.12:1978 ii BSI 12-1998 Foreword This revision of BS 4737 has been prepared under the direction of the Electronic Equipment Standards Committee to reflect the technical advances in the industry since the publication of the 1971 edition. It takes account of AmendmentNo.1,1972 (AMD1064) and of
11、 Amendment No.2,1973 (AMD1218). It is being published in a number of separate Sections, as follows. Part 1: Requirements for systems with audible signalling only; Section 1.1: Installation; Section 1.2: Maintenance and records. Part 2: Requirements for systems with remote signalling; Section 2.1: In
12、stallation; Section 2.2: Maintenance and records. Part 3: Requirements for detection devices, consisting of a number of separate Sections(3.1to3.14). The specifications for detection devices (including this Section of BS4737) are to be read in conjunction with Section1.1 or Section2.1, as appropriat
13、e. 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 from legal obligations. Summary of pages This document compris
14、es a front cover, an inside front cover, pages i and ii, pages1 and 2, 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 indicated in the amendment table on theinside front cover.BS4737-3.12:1978 BSI 12-1
15、998 1 1 Scope This British Standard specifies the general requirements for beam interruption detectors to be used in intruder alarm systems in buildings. 2 References The titles of the standards publications referred to in this standard are listed on the inside back cover. 3 Definition For the purpo
16、ses of this British Standard, the following definition applies in addition to those given in BS4737-1.1 and/or BS 4737-2.1. beam interruption detector. a detection device designed to generate an alarm condition when a beam of radiation between a transmitter and a receiver is completely interrupted.
17、4 Range and beam angle requirements 4.1 Range. The range shall be the greatest separation between the transmitter and the receiver at which an alarm condition is not generated as a result of a 50% reduction in the power level of the signal received. 4.2 Beam angle. The manufacturer shall state both
18、the dimensions of the transmitted beam over which the receiver will satisfy4.1 and the polar diagram of the receiver. 5 Signal processing The detector shall generate an alarm condition of at least 800ms duration as a result of the complete interruption of the signal received for any period longer th
19、an 40ms. The detector shall not generate an alarm condition as a result of the complete interruption of the signal received for any period shorter than 20ms. 6 Modulation The detector shall incorporate some method of modulation such that the introduction of an unmodulated source of wavelength compar
20、able with that of the transmitter shall not prevent an alarm condition being generated or shall generate an alarm condition. 7 Power supply An alarm condition shall be generated if the voltage of the power supply to the detector is reduced sufficiently to impair the performance of the detector. 8 En
21、vironment The requirements of this British Standard shall be met by the detector under any combination of the following environmental conditions. 9 Interference The detector shall be adequately protected against any externally-generated radio-frequency interference and/or mains-borne interference wh
22、ich may normally be expected to occur within the working environment. 10 Anti-tamper device The detector shall be so designed that opening its container by the normal means of access shall operate an anti-tamper device. Temperature: 0 C to 40 C Relative humidity: 10 % to 90 %2 blankBS4737-3.12:1978
23、BSI 12-1998 Standards publications referred to BS 4737, Specification for intruder alarm systems in buildings. BS 4737-1, Requirements for systems with audible signalling only. BS 4737-1.1, Installation. BS 4737-1.2, Maintenance and records 1) . BS 4737-2, Requirements for systems with remote signal
24、ling. BS 4737-2.1, Installation. BS 4737-2.2, Maintenance and records 1) . BS 4737-3, Requirements for detection devices 1) . BS 4737-3.1, Continuous wiring. BS 4737-3.2, Foil on glass. BS 4737-3.3, Protective switches. BS 4737-3.4, Radiowave Doppler detectors. BS 4737-3.5, Ultrasonic movement detec
25、tors. BS 4737-3.6, Acoustic detectors. BS 4737-3.7, Passive infra-red detectors. BS 4737-3.8, Volumetric capacitive detectors. BS 4737-3.9, Pressure mats. BS 4737-3.10, Vibration detectors. BS 4737-3.11, Rigid printed-circuit wiring. BS 4737-3.13, Capacitive proximity detectors. BS 4737-3.14, Delibe
26、rately-operated devices. 1) Referred to in the foreword only.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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