《BS-8494-2007.pdf》由会员分享，可在线阅读，更多相关《BS-8494-2007.pdf（18页珍藏版）》请在三一文库上搜索。
1、BS 8494:2007 Electronic portable and transportable apparatus designed to detect and measure carbon dioxide in indoor ambient air Requirements and test methods ICS 13.040.20; 13.320; 29.260.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Licensed Copy: Londo
2、n South Bank University, London South Bank University, Wed Aug 08 03:51:55 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2007 ISBN 978 0 580 50932 2 The following BS
3、I references relate to the work on this standard: Committee reference GEL/31/19 Draft for comment 06/30154996 DC Publication history First published July 2007 Amendments issued since publication Amd. no.DateText affected BS 8494:2007 Licensed Copy: London South Bank University, London South Bank Uni
4、versity, Wed Aug 08 03:51:55 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2007i BS 8494:2007 Contents Foreword ii 1Scope 1 2Normative references 1 3Terms and definitions 1 4Construction, labelling and instructions 3 5Performance 6 6Testing 7 Bibliography 12 List of tables Table 1 CO2 test gases 7
5、Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 12, an inside back cover and a back cover. Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:51:55 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 8494:2007
6、ii BSI 2007 Foreword Publishing information This British Standard is published by BSI and came into effect on 31 July 2007. It was prepared by Subcommittee GEL/31/19, Gas detectors, under the authority of Technical Committee GEL/31, Equipment for explosive atmospheres. A list of organizations repres
7、ented on this committee can be obtained on request to its secretary. Information about this document This is a new standard, which has been written to fill a need for the standardization of electronic portable apparatus designed to detect and measure carbon dioxide. Hazard warnings WARNING. This Bri
8、tish Standard calls for the use of substances and/or procedures that can be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. Use of this document Any use
9、r claiming compliance with this British Standard is expected to be able to justify any course of action that deviates from its recommendations. It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experi
10、enced people, for whose use it has been produced. Presentational conventions The provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”. Commentary, explanation and general informative mater
11、ial is presented in smaller italic type, and does not constitute a normative element. Contractual and legal considerations This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard ca
12、nnot confer immunity from legal obligations. Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:51:55 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 20071 BS 8494:2007 1 Scope This British Standard specifies requirements for the construction, testing and perform
13、ance of electronic portable and transportable apparatus for the detection and measurement of carbon dioxide (CO2) in indoor ambient air, which includes air entering mechanical ventilation systems in dwellings, commercial premises and industrial premises. This standard covers equipment to indicate up
14、 to typically 20 000 ppm (2%) CO2 in air. NOTE 1The CO2 measuring capabilities of indoor air quality apparatus are covered by this standard. NOTE 2The measurement capabilities of electronic portable and transportable apparatus that are additional to the measurement of CO2 are not covered in this sta
15、ndard. Other standards that cover these additional measurement capabilities include BS EN 50379 for electronic portable combustion gas analysers and BS EN 45544 for toxic gas detection apparatus having an alarm function for alerting an operator to an unsafe workplace atmosphere. 2 Normative referenc
16、es The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS 4884-1, Technical manuals Part 1: Specifica
17、tion for presentation of essential information BS EN 50270, Electromagnetic compatibility Electrical apparatus for the detection and measurement of combustible gases, toxic gases or oxygen BS EN 60079-0:2004, Electrical apparatus for explosive gas atmospheres Part 0: General requirements BS EN 60335
18、-1:2002, Household and similar electrical appliances Safety Part 1: General requirements BS EN 60529, Degrees of protection provided by enclosures (IP code) 3 Terms and definitions For the purposes of this British Standard, the following terms and definitions apply. 3.1ambient air normal atmosphere
19、surrounding the apparatus NOTEThe concentration of CO2 in ambient air is typically different from the concentration in outdoor air. 3.2aspirated apparatus gas detection apparatus that obtains the gas by drawing it through a sample line to the gas sensor, for example, by means of a hand-operated or e
20、lectric pump BS EN 61779-1:2000, 2.2.2 Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:51:55 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 8494:2007 2 BSI 2007 3.3battery-powered apparatus designed to be energized from batteries alone, whether disposable or r
21、echargeable 3.4calibration process of determining the deviation of a measuring apparatus relative to a standard and subsequent adjustment, if necessary, to achieve the manufacturers stated specification 3.5clean air air that contains CO2 at outdoor air concentrations but is free of other gases and v
22、apours to which the sensing element is sensitive or which influence the performance of the sensing element 3.6diffusion apparatus apparatus in which the transfer of gas from the atmosphere to the gas sensor takes place by random molecular movement, i.e. under conditions in which there is no aspirate
23、d flow BS EN 61779-1:2000, 2.2.4 3.7dwellings unit of residential accommodation including residential park homes, flats, bed-sits, maisonettes, terraced, semi-detached and detached houses (including all such residential accommodation situated within or forming part of commercial or industrial or agr
24、icultural premises), leisure accommodation and boats, excluding vessels with an international load line certificate NOTEIt is recognized that the guidance can be applied to premises other than dwellings, such as those supplying a small number of clients on a bed and breakfast basis. BS 7967-1:2005,
25、3.1 3.8electronic portable combustion gas analyser electronic apparatus that will detect and measure the presence of combustion gases and clearly display the result BS 7967-1:2005, 3.4 3.9gas concentration amount of CO2 present expressed as parts per million or percent by volume NOTEParts per millio
26、n (ppm) measurements can be expressed as parts per million (volume) (ppmv). 3.10indoor air quality apparatus apparatus used to determine the health and comfort of the air inside buildings, often used for analysing the efficiency of air filtration and ventilation systems NOTEThe apparatus can be desi
27、gned to measure a number of different factors, such as gaseous composition, temperature, relative humidity and airborne contaminant levels. 3.11portable apparatus apparatus that has been designed to be carried readily from place to place and to be used while it is being carried Licensed Copy: London
28、 South Bank University, London South Bank University, Wed Aug 08 03:51:55 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 20073 BS 8494:2007 3.12probe part of the measuring system that is placed in ambient air including air entering a mechanical ventilation system for the purpose of sampling the gas
29、3.13response time (t90) time interval with the apparatus in a warmed-up condition, between the time when an instantaneous variation of the parameter to be measured is produced at the apparatus inlet, and the time when the response reaches and remains beyond 90% of the final indication BS EN 50379-1:
30、2004, 3.16 3.14sensor assembly in which the sensing element is housed, and which can contain associated electronic components 3.15test gas air containing a known concentration of CO2 3.16transportable apparatus apparatus not intended to be portable but which can be readily moved from place to place
31、3.17warm up period time taken for the apparatus to reach the manufacturers specified operating performance from switch on, or following power failure in the case of mains powered equipment 4 Construction, labelling and instructions 4.1Construction 4.1.1General 4.1.1.1 All parts of the apparatus, inc
32、luding the sensors and probe, shall be constructed of materials that will not be affected by vapours and gases or chemical substances typically found in the environment in which it is intended to be used see 4.2.2c). 4.1.1.2 All materials and components forming part of the apparatus shall be used wi
33、thin the manufacturers ratings or limits, as specified by the material or component supplier, unless otherwise certified by the manufacturer of the apparatus. 4.1.2Degree of mechanical strength and protection 4.1.2.1 The apparatus shall conform to IP42, as defined in BS EN 60529. The sampling system
34、 shall be so constructed as to prevent damage to the sensors and pump by such particulate matter and liquids that might be expected in the application. Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:51:55 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 8494:20
35、07 4 BSI 2007 4.1.2.2 The resistance to impact of the apparatus shall be tested in accordance with BS EN 60079-0:2004, 26.4.2, and be capable of withstanding a low impact resistance for Group II apparatus in accordance with BS EN 60079-0:2004, Table 8. If mechanical protection such as a carrying cas
36、e is provided, this test shall be carried out with the apparatus assembled in the form in which it is intended to be used. 4.1.2.3 Adjustments that might affect the performance of the apparatus shall be suitably protected against unauthorized changes, such as through the use of passwords, tamper-evi
37、dent seals or special tools. 4.1.3Power supplies 4.1.3.1 For battery-powered apparatus, the batteries specified by the manufacturer shall have sufficient capacity to enable accurate readings of gas concentration and other measurement parameters, if provided, for at least 4 h of continuous usage. Whe
38、n the battery capacity falls below a preset level a visual warning shall be given, following which the apparatus shall operate to the performance specification for at least a further 30 min. 4.1.3.2 Apparatus provided with the means of connection to the mains supply shall conform to relevant British
39、 Standards. NOTEThis area is covered by various statutory regulations. 4.1.4Indicators 4.1.4.1 Indicators shall be provided to show: a)measured parameter, values and units of measurement; b)low battery warning for battery-powered apparatus; c)for aspirated apparatus with an integrated flow indicator
40、, a warning when a blockage occurs (see 6.3.13); d)mode of operation or apparatus status (e.g. warm-up and measurement); and e)when values lie outside the indicating range. 4.1.4.2 All values shall be indicated on a display with characters not less than 8 mm high, unless adequate provision is made f
41、or enhancing the legibility (e.g. backlighting), in which case the minimum character height shall be 4 mm. 4.1.5Range and resolution The apparatus shall indicate gas concentrations of CO2: a)at least across a range of 0 ppm to 5 000 ppm with a resolution of 50 ppm or better; and/or NOTE 1 Apparatus
42、with this range may be considered suitable, for example, when monitoring indoor air quality or measuring CO2 concentrations in commercial laundry and kitchen environments. b)across a range of 5 000 ppm to 20 000 ppm with a resolution of 2% of the displayed reading or better. NOTE 2 Apparatus with th
43、is range may be considered suitable, for example, when assessing the safe operation of open flue appliances installed in compartments. Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:51:55 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 20075 BS 8494:2007 4.1.
44、6Printer or data transfer facility When the apparatus is provided with a printer or data transfer facility, it shall print or communicate the date, time, unique apparatus identification, measured parameter, values and units of measurement specified in 4.1.5 taken at the time of the measurement. The
45、facility shall, after testing in accordance with Clause 6, repeat the displayed readings, and date and time. 4.2Labelling and instructions 4.2.1Labelling 4.2.1.1 Durable labels shall be carried on the apparatus, or moulded into the casing, giving: a)the manufacturers or suppliers name, trademark or
46、other means of identification; b)the type of apparatus, e.g. “CO2 gas analyser”, and model name or number; c)the number and year of this British Standard, i.e. BS 8494:2007; d)the manufacturers serial number or other unique apparatus identification; e)the replacement battery and mains power requirem
47、ents if relevant. NOTEAttention is drawn to the requirements for markings and instructions given in the EC directive on waste electrical and electronic equipment (WEEE). 1 4.2.1.2 Item 4.2.1.1b) shall be clearly visible during normal operation. 4.2.1.3 Item 4.2.1.1e) shall be clearly visible if the
48、batteries are being changed. 4.2.1.4 The durability of any external label shall be tested in accordance with BS EN 60335-1:2002, 7.6 and 7.14, after which the label shall not be removable and shall be legible with no curling. When apparatus is tested in accordance with Clause 6, external labels shal
49、l remain legible and in place. 4.2.2Instructions The apparatus shall be provided with an instruction booklet or leaflet, conforming to BS 4884-1. This shall give complete, clear and accurate instructions for the safe and proper operation, handling and regular checking of the apparatus, and shall include: a)the correct battery types and method of replacing or recharging batteries for battery powered units, details of mains voltage, frequency and fuse rating, if relevant, and warning of the possible hazards of electric shock or malfu