1、BRITISH STANDARD BS 4737-3.6: 1978 Specification for Intruder alarm systems in buildings Part 3: Requirements for detection devices Section 3.6 Acoustic detectors UDC 696.6:654.924.32:681.88BS4737-3.6:1978 This British Standard, having been prepared under the direction of the Electronic Equipment St
2、andards 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 reference EEL/27 Draft for comment 74/25543 DC ISBN 0 580 10
3、372 2 Cooperating organizations The Electronic Equipment Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: British Broadcasting Corporation British Electri
4、cal 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 Electricity Supply Industry in England and Wales Electron
5、ic 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 Association The organizations marked with an asterisk
6、 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 Association British Railways Board British Security
7、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 Engineering and Manufacturing Association The Committee
8、of London Clearing Bankers on behalf of the Scottish Clearing Bankers, Co-operative Bank, Central Trustee Savings Bank and Yorkshire Bank Amendments issued since publication Amd. No. Date of issue Comments March 1980 Indicated by a sideline in the marginBS4737-3.6:1978 BSI 12-1998 i Contents Page Co
9、operating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Frequency requirement 1 5 Sensitivity 1 6 Signal processing 1 7 Power supply 1 8 Environment 1 9 Interference 1 10 Anti-tamper precautions 1 Standards publications referred to Inside back coverBS4737-3.
10、6:1978 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 Amendment No.1, 1972 (AMD 1064) and of Amendm
11、ent No. 2, 1973 (AMD 1218). 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: Instal
12、lation; Section 2.2: Maintenance and records; Part 3: Requirements for detection devices, consisting of a number of separate Sections (3.1 to 3.14). The specifications for detection devices (including this Section of BS 4737) are to be read in conjunction with Section 1.1 or Section 2.1, as appropri
13、ate. 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 compr
14、ises a front cover, an inside front cover, pages i and ii, pages 1 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.BS4737-3.6:1978 BSI 12
15、-1998 1 1 Scope This British Standard specifies the general requirements for acoustic 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 Definitions For the purposes of
16、 this British Standard, the following definitions apply in addition to those given in BS 4737-1.1 and/or BS 4737-2.1. 3.1 acoustic detector a detection device designed to generate an alarm condition in response to the air-borne sounds resulting from a physical attack on the structure 3.2 trigger lev
17、el the lowest level of acoustic signal within the specified frequency band at the input to the sound detector which, if it persists long enough, will cause an alarm condition to be generated 4 Frequency requirement The manufacturer shall state the lowest and highest frequencies of each frequency ban
18、d of the response of the detector to acoustic signals; these limits shall be specified at the half-power points of the response. 5 Sensitivity The detector shall be provided with a sensitivity control set such that the trigger level is not less than15 dB above the ambient noise level, within the fre
19、quency range of the detector as measured bya sound level meter complying with the requirements of BS 3489, subject to a maximum trigger level of 85dB(A). Subject to these limits, a variable sensitivity control, if one is provided, shall not permit more than 6 dB variation in the sensitivity. Variati
20、on of the sensitivity shall not significantly affect the frequency response. 6 Signal processing The detector shall generate an alarm condition in response to input signals equal to the trigger level lasting for a total of more than 5 s during any overall period of 30 s. The detector shall generate
21、an alarm condition in response to any input signal greater than 120 dB(A), as measured by a sound level meter complying with the requirements of BS3489, lasting for more than 100 ms. 7 Power supply An alarm condition shall be generated if the voltage of the power supply to the detector is reduced su
22、fficiently to impair the performance of the detector. 8 Environment 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
23、-frequency interference and/or mains-borne interference which may normally be expected to occur within the working environment. 10 Anti-tamper precautions The detector shall be so constructed and mounted that the electrical test and adjustment operations are possible without movement of the device o
24、n its mounting. It shall not be possible to adjust the equipment without operating an anti-tamper device. Temperature: 0 C to 40 C Relative humidity: 10 % to 90 %2 blankBS4737-3.6:1978 BSI 12-1998 Standards publications referred to BS 3489, Sound level meters (industrial grade). BS 4737, Specificati
25、on 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 signalling. BS 4737-2.1, Installation; BS 4737-2.2, Maintenance and recor
26、ds 1) . BS 4737-3, Requirements for detection devices. 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 detectors. BS 4737-3.7, Passive infra-red detectors. BS 4737-3.8, Volumetric
27、 capacitive detectors. BS 4737-3.9, Pressure mats. BS 4737-3.10, Vibration detectors. BS 4737-3.11, Rigid printed-circuit wiring. BS 4737-3.12, Beam interruption detectors. BS 4737-3.13, Capacitive proximity detectors. BS 4737-3.14, Deliberately-operated devices. 1) Referred to in the foreword only.
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