BS 8494-2007 Electronic portable and transportable apparatus designed to detect and measure carbon dioxide in indoor ambient air - Requirements and test methods《计划用于检测和测量室内环境空气中二氧化.pdf

1、BS 8494:2007Electronic portable and transportable apparatus designed to detect and measure carbon dioxide in indoor ambient air Requirements and test methodsICS 13.040.20; 13.320; 29.260.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDLicensed Copy: Wang Bin,

2、na, Mon Oct 08 07:12:52 GMT+00:00 2007, Uncontrolled Copy, (c) BSIPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2007ISBN 978 0 580 50932 2The following BSI references relate to the work on this standard:Commit

3、tee reference GEL/31/19Draft for comment 06/30154996 DCPublication historyFirst published July 2007Amendments issued since publicationAmd. no. Date Text affectedBS 8494:2007Licensed Copy: Wang Bin, na, Mon Oct 08 07:12:52 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2007 iBS 8494:2007ContentsForew

4、ord ii1 Scope 12 Normative references 13 Terms and definitions 14 Construction, labelling and instructions 35 Performance 66 Testing 7Bibliography 12List of tablesTable 1 CO2test gases 7Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 12, an in

5、side back cover and a back cover.Licensed Copy: Wang Bin, na, Mon Oct 08 07:12:52 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS 8494:2007ii BSI 2007ForewordPublishing informationThis British Standard is published by BSI and came into effect on 31 July 2007. It was prepared by Subcommittee GEL/31/19,

6、Gas detectors, under the authority of Technical Committee GEL/31, Equipment for explosive atmospheres. A list of organizations represented on this committee can be obtained on request to its secretary.Information about this documentThis is a new standard, which has been written to fill a need for th

7、e standardization of electronic portable apparatus designed to detect and measure carbon dioxide.Hazard warningsWARNING. This British 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 suitabil

8、ity and does not absolve the user from legal obligations relating to health and safety at any stage.Use of this documentAny user 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 pre

9、paration of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Its requirements are ex

10、pressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all the nec

11、essary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Licensed Copy: Wang Bin, na, Mon Oct 08 07:12:52 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2007 1BS 8494:20071 ScopeThis British St

12、andard specifies requirements for the construction, testing and performance 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

13、 and industrial premises. This standard covers equipment to indicate up to typically 20 000 ppm (2%) CO2in air.NOTE 1 The CO2measuring capabilities of indoor air quality apparatus are covered by this standard.NOTE 2 The measurement capabilities of electronic portable and transportable apparatus that

14、 are additional to the measurement of CO2are not covered in this standard. 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

15、 an operator to an unsafe workplace atmosphere.2 Normative referencesThe 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 a

16、mendments) applies.BS 4884-1, Technical manuals Part 1: Specification for presentation of essential informationBS EN 50270, Electromagnetic compatibility Electrical apparatus for the detection and measurement of combustible gases, toxic gases or oxygenBS EN 60079-0:2004, Electrical apparatus for exp

17、losive gas atmospheres Part 0: General requirementsBS EN 60335-1:2002, Household and similar electrical appliances Safety Part 1: General requirementsBS EN 60529, Degrees of protection provided by enclosures (IP code)3 Terms and definitionsFor the purposes of this British Standard, the following ter

18、ms and definitions apply.3.1 ambient airnormal atmosphere surrounding the apparatusNOTE The concentration of CO2in ambient air is typically different from the concentration in outdoor air.3.2 aspirated apparatusgas detection apparatus that obtains the gas by drawing it through a sample line to the g

19、as sensor, for example, by means of a hand-operated or electric pumpBS EN 61779-1:2000, 2.2.2Licensed Copy: Wang Bin, na, Mon Oct 08 07:12:52 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS 8494:20072 BSI 20073.3 battery-poweredapparatus designed to be energized from batteries alone, whether disposable

20、 or rechargeable3.4 calibrationprocess of determining the deviation of a measuring apparatus relative to a standard and subsequent adjustment, if necessary, to achieve the manufacturers stated specification3.5 clean airair that contains CO2at outdoor air concentrations but is free of other gases and

21、 vapours to which the sensing element is sensitive or which influence the performance of the sensing element3.6 diffusion apparatusapparatus 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 aspirat

22、ed flowBS EN 61779-1:2000, 2.2.43.7 dwellingsunit 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 agri

23、cultural premises), leisure accommodation and boats, excluding vessels with an international load line certificateNOTE It 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, 3.

24、13.8 electronic portable combustion gas analyserelectronic apparatus that will detect and measure the presence of combustion gases and clearly display the resultBS 7967-1:2005, 3.43.9 gas concentrationamount of CO2present expressed as parts per million or percent by volumeNOTE Parts per million (ppm

25、) measurements can be expressed as parts per million (volume) (ppmv).3.10 indoor air quality apparatusapparatus used to determine the health and comfort of the air inside buildings, often used for analysing the efficiency of air filtration and ventilation systemsNOTE The apparatus can be designed to

26、 measure a number of different factors, such as gaseous composition, temperature, relative humidity and airborne contaminant levels.3.11 portable apparatusapparatus that has been designed to be carried readily from place to place and to be used while it is being carriedLicensed Copy: Wang Bin, na, M

27、on Oct 08 07:12:52 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2007 3BS 8494:20073.12 probepart of the measuring system that is placed in ambient air including air entering a mechanical ventilation system for the purpose of sampling the gas3.13 response time (t90)time interval with the apparatus

28、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 indicationBS EN 50379-1:2004, 3.163.14 sensorassembly in which the sensing element

29、 is housed, and which can contain associated electronic components3.15 test gasair containing a known concentration of CO23.16 transportable apparatusapparatus not intended to be portable but which can be readily moved from place to place3.17 warm up periodtime taken for the apparatus to reach the m

30、anufacturers specified operating performance from switch on, or following power failure in the case of mains powered equipment4 Construction, labelling and instructions4.1 Construction4.1.1 General4.1.1.1 All parts of the apparatus, including the sensors and probe, shall be constructed of materials

31、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 within the manufacturers ratings or limits, as specified by the mat

32、erial or component supplier, unless otherwise certified by the manufacturer of the apparatus.4.1.2 Degree of mechanical strength and protection4.1.2.1 The apparatus shall conform to IP42, as defined in BS EN 60529. The sampling system shall be so constructed as to prevent damage to the sensors and p

33、ump by such particulate matter and liquids that might be expected in the application.Licensed Copy: Wang Bin, na, Mon Oct 08 07:12:52 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS 8494:20074 BSI 20074.1.2.2 The resistance to impact of the apparatus shall be tested in accordance with BS EN 60079-0:200

34、4, 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 case is provided, this test shall be carried out with the apparatus assembled in the form in which it is intended to be

35、 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-evident seals or special tools.4.1.3 Power supplies4.1.3.1 For battery-powered apparatus, the batteries specified by the

36、 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. When the battery capacity falls below a preset level a visual warning shall be given, following which the apparatus shall

37、 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 Standards.NOTE This area is covered by various statutory regulations.4.1.4 Indicators4.1.4.1 Indicators shall be provi

38、ded 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, a warning when a blockage occurs (see 6.3.13);d) mode of operation or apparatus status (e.g. warm-up and measurement);

39、 ande) 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 for enhancing the legibility (e.g. backlighting), in which case the minimum character height shall be 4 mm.4.1.5 Range and

40、 resolutionThe 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/orNOTE 1 Apparatus with this range may be considered suitable, for example, when monitoring indoor air quality or measuring CO2concentrations

41、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 this range may be considered suitable, for example, when assessing the safe operation of open flue appliances installed in comp

42、artments.Licensed Copy: Wang Bin, na, Mon Oct 08 07:12:52 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2007 5BS 8494:20074.1.6 Printer or data transfer facilityWhen the apparatus is provided with a printer or data transfer facility, it shall print or communicate the date, time, unique apparatus id

43、entification, measured parameter, values and units of measurement specified in 4.1.5 taken at the time of the measurement. The facility shall, after testing in accordance with Clause 6, repeat the displayed readings, and date and time.4.2 Labelling and instructions4.2.1 Labelling4.2.1.1 Durable labe

44、ls shall be carried on the apparatus, or moulded into the casing, giving:a) the manufacturers or suppliers name, trademark or other means of identification;b) the type of apparatus, e.g. “CO2gas analyser”, and model name or number;c) the number and year of this British Standard, i.e. BS 8494:2007;d)

45、 the manufacturers serial number or other unique apparatus identification;e) the replacement battery and mains power requirements if relevant.NOTE Attention is drawn to the requirements for markings and instructions given in the EC directive on waste electrical and electronic equipment (WEEE). 14.2.

46、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 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

47、removable and shall be legible with no curling. When apparatus is tested in accordance with Clause 6, external labels shall remain legible and in place.4.2.2 Instructions The apparatus shall be provided with an instruction booklet or leaflet, conforming to BS 4884-1. This shall give complete, clear

48、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

49、 warning of the possible hazards of electric shock or malfunction, if tampered with;b) an explanation of all warning and other indications;c) a list of commonly occurring materials, vapours or gases (e.g. cleaning fluids, polishes, paints and cooking operations) that might affect the operation or reliability of the apparatus in the short or long term;d) guidance on the life expectancy of the apparatus and batteries;Licensed Copy: Wang Bin, na, Mon Oct 08 07:12:52 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS 8494:20076 BSI