1、BSI Standards PublicationBS EN 50244:2016Electrical apparatus for thedetection of combustible gasesin domestic premises Guideon the selection, installation,use and maintenanceBS EN 50244:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50244:2016. Itsupersed
2、es BS EN 50244:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EXL/31/1, Gas detectors.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessarypr
3、ovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 91429 4ICS 13.320Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published
4、under the authority of theStandards Policy and Strategy Committee on 31 May 2016.Amendments issued since publicationDate Text affectedBS EN 50244:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50244 May 2016 ICS 13.320 Supersedes EN 50244:2000English Version Electrical apparatus for the de
5、tection of combustible gases in domestic premises - Guide on the selection, installation, use and maintenance Appareils lectriques pour la dtection des gaz combustibles dans les locaux usage domestique - Guide de slection, dinstallation, dutilisation et de maintenance Elektrische Gerte fr die Detekt
6、ion von brennbaren Gasen in Wohnhusern - Leitfaden fr Auswahl, Installation, Einsatz und Wartung This European Standard was approved by CENELEC on 2016-03-14. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standar
7、d the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (Englis
8、h, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of A
9、ustria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, S
10、pain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CENELEC All rights
11、of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50244:2016 EBS EN 50244:2016EN 50244:2016 (E) 2 Contents Page European foreword . 3 Introduction . 4 1 Scope 5 2 Normative references 5 3 Terms and definitions 5 4 Sensing of combustible gas 6 5 Types of
12、 apparatus . 7 6 Installation . 8 6.1 General . 8 6.2 Gas releases . 8 6.2.1 General . 8 6.2.2 Source of the gas escape 8 6.2.3 Examples of behaviour of gas releases . 9 6.2.4 Positioning of the gas detector . 10 6.3 Remote Detector Heads . 12 6.4 Mains power supply 12 7 Executive functions (type A
13、apparatus only) . 13 7.1 General . 13 7.2 Shut-off valve 13 7.3 Ventilation fan . 13 7.4 Main electric switch . 13 7.5 Remote alarm . 13 7.6 Additional visual alarm 13 7.7 Link between detector and ancillary device 13 7.8 Fault relays . 13 8 Advice to the user . 14 8.1 Manufacturers instructions . 1
14、4 8.2 Location 14 8.3 Power supply 14 8.4 Indicators 14 8.5 Alarms . 14 8.6 Maintenance . 15 8.7 Lifetimes 15 9 Emergency actions 15 Bibliography . 16 BS EN 50244:2016EN 50244:2016 (E) 3 European foreword This document (EN 50244:2016) has been prepared by CLC/TC 216 “Gas detectors”. The following da
15、tes are fixed: latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2017-03-14 latest date by which the national standards conflicting with this document have to be withdrawn (dow) 2019-03-14 This document
16、 supersedes EN 50244:2000. EN 50244:2016 includes the following significant technical changes with respect to EN 50244:2000 (various minor changes have also been made): General information added to cover domestic premises, boats and caravans. This is a result of the splitting of EN 50194 into EN 501
17、94-1 and EN 50194-2. In Clause 4 text has been added regarding alarm set points for apparatus complying with EN 50194-1. A new Clause 5 has been created to provide further information to the user concerning the differences between Type A and Type B devices. Former Clause 5 has been renumbered Clause
18、 6, text has been reformulated to avoid repetition and make it easier to understand. New Figures 1 and 2 created, to show the typical locations of combustible gas alarms when used with Natural Gas and LPG installations. The text in Clause 7 “Executive Actions” has been aligned with EN 50292, where a
19、pplicable, for combustible gas alarms. In Clause 8 “Advice to the User”, additional text has been added to highlight the differences between location of a combustible gas detector and a carbon monoxide alarm. Attention is drawn to the possibility that some of the elements of this document may be the
20、 subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. BS EN 50244:2016EN 50244:2016 (E) 4 Introduction This European Standard is intended to be a guide for people who, in the course of their professional activities, are required to
21、 install combustible gas detectors in domestic premises. It is also aimed at anyone who might supply such gas detectors to members of the public for subsequent installation by competent persons according to national regulations, so that advice may be given based on good engineering practice. Apparat
22、us for the detection of combustible gases are not a substitute for good gas installation practice and regular servicing of gas appliances, although they may provide an added margin of reassurance for users of gaseous fuels. Domestic combustible gas detectors with or without some form of executive fu
23、nction may overcome fears of fuel safety and can be particularly beneficial in certain circumstances. BS EN 50244:2016EN 50244:2016 (E) 5 1 Scope This European Standard provides information on the selection, installation, use and maintenance of apparatus for the detection of combustible gas designed
24、 for continuous operation in a fixed installation in domestic premises as described in the EN 50194 series. This guide should be read in conjunction with any additional relevant national or local regulations. The European Standard refers to the installation of two types of apparatus designed to oper
25、ate in the event of an escape of town gas, natural gas or liquefied petroleum gas: Type A apparatus - to provide a visual and audible alarm and an executive action in the form of an output signal that may actuate directly or indirectly a shut-off device and/or other ancillary device; Type B apparatu
26、s - to provide visual and audible alarms only. This guide is not applicable to the use of apparatus: for the detection of toxic gases such as carbon monoxide, see EN 50292; for industrial or commercial premises, see EN 60079-29-2. 2 Normative references The following documents, in whole or in part,
27、are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1775, Gas supply - Gas pipework for buildings - Ma
28、ximum operating pressure less than or equal to 5 bar - Functional recommendations EN 50194 (all parts), Electrical apparatus for the detection of combustible gases in domestic premises EN 60079-29-2, Explosive atmospheres Part 29-2: Gas detectors Selection, installation, use and maintenance of detec
29、tors for flammable gases and oxygen (IEC 60079-29-2) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 lower explosive limit LEL volume ratio of combustible gas or vapour in air below which an explosive gas atmosphere will not be formed 3.2 upp
30、er explosive limit UEL volume ratio of combustible gas or vapour in air above which an explosive gas atmosphere will not be formed 3.3 continuous operation apparatus which is continuously powered with continuous or intermittent automatic sensing BS EN 50244:2016EN 50244:2016 (E) 6 3.4 sensor assembl
31、y in which the sensing element is housed that may contain associated circuit components 3.5 sensing element device, the output of which will change in the presence of combustible gas 3.6 ventilation movements and replacement of air resulting from wind, temperature gradients, or artificial means (e.g
32、. fans or extractors) 3.7 relative density density of gas or vapour relative to the density of air at the same pressure and at the same temperature Note 1 to entry: Air is equal to 1,0. 3.8 gas detection apparatus apparatus comprising the sensor, remote sensor if applicable, alarm and other circuit
33、components, power supply and for type A apparatus a means of providing an output signal 3.9 domestic premises house or building which is the place of residence or home of a household, family or person 3.10 fixed installation apparatus which is intended to have all parts except replaceable batteries
34、permanently installed 3.11 output signal signal characterized by a standby state and an activated state by which action may be initiated EXAMPLE Triggering of a shut-off device. 3.12 warm-up time time interval between the time when the apparatus is switched on and the time when the apparatus is full
35、y operational 3.13 volume ratio (v/v) (commonly referred to as concentration) ratio of the volume of a component to the volume of the gas mixture 4 Sensing of combustible gas There are three main hazards arising from combustible gases: explosion, poisoning and annoxia (insufficient oxygen). This doc
36、ument deals only with the explosion hazard of combustible gases. Distributed gas has an odour added at source to ensure that the general public may recognize any leakage by a characteristic smell. Most people may detect this odour at quite low gas concentration levels (2 % LEL, or less) but some med
37、ical conditions as well as increasing age may result in a reduction in the sense of smell. A gradually increasing gas concentration may also BS EN 50244:2016EN 50244:2016 (E) 7 go unnoticed due to olfactory fatigue (temporary inability to distinguish an odour, due to continued exposure of a smell.)
38、The conditions under which combustion occurs are variable and is dependent upon the gas composition. When the concentration level of gas is between the LEL and UEL and there is a source of ignition, the gas mixture will burn or explode. For natural gas, the LEL is between 4 % v/v and 5 % v/v of gas
39、in air and the UEL is about 15 % v/v of gas in air. For LPG, the LEL is between 1 % v/v and 2 % v/v of gas in air and the UEL is about 10 % v/v of gas in air. The alarm set points of devices compliant with the EN 50194 series shall be between 3 % and 20 % LEL of the gas to be detected, which means t
40、hat an alarm will activate well before an ignition hazard occurs. Each apparatus is specifically designed and calibrated for a specific gas hence it is essential that an apparatus, calibrated for one gas, is not used to detect another. 5 Types of apparatus There are many different types of gas senso
41、rs available, for example, catalytic, semiconductor and infrared, details of which may be found in EN 60079-29-2. Gas detection apparatus should comply with the requirements of EN 50194-1 and EN 50194-2, as applicable. Various additional options may be available to the person selecting the apparatus
42、 to be installed, in addition to gas detection. Some systems may incorporate sensors other than those for detection of flammable gases, such as carbon monoxide, and care should be taken to avoid confusion between different signals that may require conflicting actions by the user. Such problems might
43、 best be overcome by integrating individual apparatus, together with a centralized control and alarm annunciator. The main choice is between type A or type B apparatus (that is, with or without an executive function, see Clause 7) either of which may involve further considerations as follows: Type A
44、: May be particularly useful for people with some physical disability that might delay a manual response to an alarm. They are more likely to be used in a fixed (rather than portable or transportable) installation, because of the need to transmit an output signal for activation of the ancillary devi
45、ce(s). However developments in communication technologies (such as wireless) may allow even greater flexibility, so long as the overall reliability of the gas detection system is not compromised. The principal advantage of Type A devices is that the output signal can be used to activate an isolation
46、 valve to shut off the incoming gas supply. Type B: Intended for either fixed or portable installation, with portable apparatus almost certainly powered from high capacity internal batteries alone. Besides the usual siting considerations, special care should be taken with portable units to ensure th
47、at they are always properly positioned in relation to the ambient air being sampled. In addition, the user should be cautioned against intermittent operation of the apparatus and dropping or damaging it while being re-located. Type B devices have the disadvantage in that there is no automatic execut
48、ive action possible. BS EN 50244:2016EN 50244:2016 (E) 8 6 Installation 6.1 General The manufacturer is required to provide suitable instructions for the correct and safe installation of the apparatus. These should be read carefully before installing or operating the apparatus. Generally, the same s
49、iting considerations apply to both type A and type B apparatus. Combustible gases used in domestic premises generally fall into two categories, lighter than air and heavier than air. Information on these gases can be found in 6.2. The design and layout of domestic premises (as well as caravans and boats) and the number, type and position of combustible gas sources vary widely. General guidance is given in the following clauses on where and where not to locate the apparatus in order to minimize the risk of misleading indications. To sel
