《BS-EN-13274-6-2002.pdf》由会员分享,可在线阅读,更多相关《BS-EN-13274-6-2002.pdf(18页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 13274-6:2002 Respiratory protective devices Methods of test Part 6: Determination of carbon dioxide content of the inhalation air The European Standard EN 13274-6:2001 has the status of a British Standard ICS 13.340.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY C
2、OPYRIGHT LAW BS EN 13274-6:2002 This British Standard, having been prepared under the direction of the Health and Environment Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 26 February 2002 BSI 26 February 2002 ISBN 0 580 391
3、95 7 National foreword This British Standard is the official English language version of EN 13274-6:2001. The UK participation in its preparation was entrusted by Technical Committee PH/4, Respiratory protection, to Subcommittee PH/4/9, Test methods and interpretation, which has the responsibility t
4、o: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “
5、International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. 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 wi
6、th a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and Eur
7、opean developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 15 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since p
8、ublication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13274-6 December 2001 ICS 13.340.30 English version Respiratory protective devices - Methods of test - Part 6: Determination of carbon dioxide content of the inhalation air Appareils de protection respiratoire - Mt
9、hodes dessai - Partie 6: Dtermination de la teneur en dioxyde de carbone de lair inhal Atemschutzgerte - Prfverfahren - Teil 6: Bestimmung des Kohlenstoffdioxid-Gehaltes der Einatemluft This European Standard was approved by CEN on 16 November 2001. CEN members are bound to comply with the CEN/CENEL
10、EC Internal Regulations which stipulate the conditions for giving this European Standard 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 Management Centre or to any CEN
11、member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN membe
12、rs are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATIO
13、N EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13274-6:2001 E EN 13274-6:2001 (E) 2 Contents page Foreword3 Introduction.4 1Scope 4 2Norma
14、tive references 4 3Terms and definitions4 4Prerequisites 4 5Test method5 5.1Principle5 5.2Test equipment 5 5.2.1General5 5.2.2Breathing machine.5 5.2.3Carbon dioxide sampling arrangement.5 5.2.4Sheffield head/torso 5 5.2.5Auxiliary fan6 5.2.6Carbon dioxide sampling of ambient air .6 5.3Procedure for
15、 measurement of carbon dioxide in inhalation air6 Annex A (normative) Fitting procedure for hoods (with or without head harness) which seal around the neck.10 A.1Introduction10 A.2Principle10 A.3Apparatus .10 A.3.1Sheffield dummy head/torso.10 A.3.2Stand and elastic string 10 A.3.3Adjustable collar1
16、0 A.4Procedure .11 Annex B (informative) Test results - Uncertainty of measurement14 Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives15 EN 13274-6:2001 (E) 3 Foreword This European Standard has been prepared by Technical
17、Committee CEN/TC 79 “Respiratory protective devices“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2002, and conflicting national standards shall b
18、e withdrawn at the latest by June 2002. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative annex ZA, w
19、hich is an integral part of this standard. This is one of several parts, which are as follows: Part 1: Determination of inward leakage and total inward leakage Part 2: Practical performance tests Part 3: Determination of breathing resistance Part 4: Flame tests Part 5: Climatic conditions Part 6: De
20、termination of carbon dioxide content of the inhalation air Part 7: Determination of particle filter penetration Part 8: Determination of dolomite dust clogging Annex A is normative. Annex B is informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of th
21、e following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. EN 13274-6:2001 (E) 4 Introduction
22、This standard is intended as a supplement to the specific device standards for respiratory protective devices. Test methods are specified for complete or parts of devices. If deviations from the test method given in this standard are necessary, these deviations will be specified in the relevant devi
23、ce standard. 1 Scope This European Standard specifies the test procedure for measuring the carbon dioxide content in the inhaled air (dead space) of respiratory protective devices. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publica
24、tions. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision
25、. For undated references the latest edition of the publication referred to applies (including amendments). EN 132, Respiratory protective devices - Definitions of terms and pictograms. 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 132 apply
26、, together with the following: 3.1 ambient conditions atmosphere where the temperature is 16 C to 32 C and the relative humidity is 20 % to 80 % 3.2 dry atmosphere atmosphere where the relative humidity is less than 20 % 3.3 wet atmosphere atmosphere where the relative humidity is greater than or eq
27、ual to 95 % 4 Prerequisites In order to implement this part of EN 13274, at least the following parameters need to be specified in the appropriate device standard: ? number of samples; ? number of repeat tests per sample; ? sample preconditioning; ? size(s) of facepiece; ? use of dummy head or head/
28、torso; ? method of sealing facepiece to dummy head/torso (if appropriate); EN 13274-6:2001 (E) 5 ? complete equipment or facepiece only; ? device air supply on or off; ? direction of any supplementary air flow; ? pass/fail criteria; ? any deviations from test method. 5 Test method 5.1 Principle The
29、device is fitted, as described by the device standard, to a Sheffield dummy head/torso and, in the case of complete equipment tests, any air supply is operated in the manufacturers minimum condition unless prescribed otherwise by that standard. Breathing air containing a defined concentration of car
30、bon dioxide is supplied at a specified rate from a breathing machine to a dummy head/torso. The inhaled air is analysed for carbon dioxide content. The carbon dioxide level measured gives an assessment of the “dead space“ of the facepiece rather than a “real life“ measurement of the level of carbon
31、dioxide in the inhaled air. 5.2 Test equipment 5.2.1 General A typical test arrangement using a single cylinder breathing machine is shown in Figure 1. The total dead space of the gas path of the test installation, excluding the volume of the breathing machine, shall not exceed 2000 ml. The test sha
32、ll be carried out at ambient conditions. 5.2.2 Breathing machine A breathing machine and associated equipment with solenoid valves controlled by the breathing machine. In order to avoid errors in the measurement of carbon dioxide in the inhaled air, it is important that the solenoid valves make a go
33、od seal on closing and that the timing of their action allows no overlap to occur. 5.2.3 Carbon dioxide sampling arrangement A sample of the inhaled air is taken by an auxiliary lung driven by the breathing machine and in phase with it. It is set to inhale a known sample volume (a chosen percentage
34、of the inhalation volume of the breathing machine) during the inhalation stroke of the breathing machine. This apparent “loss“ in inhalation volume of the breathing machine is compensated for by the volume of carbon dioxide fed via the flowmeter into the breathing machine on its inhalation stroke. I
35、t is therefore important that these two volumes are equal. The exhaled air is continuously monitored for carbon dioxide content at a flow determined by the analyser. The sample point is immediately before the solenoid valve in the exhalation circuit. To maintain equilibrium the sample is returned to
36、 the circuit upstream of the sample point. The carbon dioxide absorber is necessary to prevent build-up of carbon dioxide in the test equipment circuit. The compensators allow constant conditions to be maintained for particular parts of the test circuit. 5.2.4 Sheffield head/torso Sheffield head fit
37、ted with concentric tubes and central carbon dioxide sampling tube, shown in Figure 2. Where a torso is fitted, the tubes are directed down the neck section to exit from the torso at a convenient point as shown in Figure A.2. The extra volume of this arrangement should be borne in mind (see 5.2.1).
38、EN 13274-6:2001 (E) 6 The end of the concentric tubes is level with the top “lip“ of the dummy head and the end of the sample tube is level with the end of the concentric tubes. The arrangement for setting up and testing hooded devices which seal around the neck is given in annex A. 5.2.5 Auxiliary
39、fan In order to ensure that the device inhales laboratory air containing a minimum level of carbon dioxide, an auxiliary fan is arranged so that it blows the exhaled air emerging from the device away from the device inlet. The fan is arranged to deliver air at 0,5 m/s when measured at a point 50 mm
40、in front of the device inlet. NOTEThe auxiliary fan arrangement is not required when carrying out tests on devices which have their own independent air supply (e.g. compressed airline devices). 5.2.6 Carbon dioxide sampling of ambient air It is necessary to assess the level of carbon dioxide in the
41、laboratory air in the immediate vicinity of the device inlet. This is achieved by using a sample probe placed at a point 50 mm in front of the device inlet. The probe is connected to the auxiliary lung used for measuring dead space. It samples during the inhalation phase of the breathing machine at
42、the same sample rate as used to measure the carbon dioxide in the inhalation air. 5.3 Procedure for measurement of carbon dioxide in inhalation air 5.3.1Confirm whether the device standard requires breathing machine settings and exhaled carbon dioxide levels which lead to sample volumes different to
43、 those specified in the following procedure. An example of the calculation necessary for different requirements is given in 5.3.10. 5.3.2Fit the facepiece or complete equipment as directed by the device standard to the Sheffield head/torso as appropriate, and operate the device in its minimum design
44、 condition defined in the device standard. Ensure as far as possible that exhaled air from the device (which during subsequent testing will contain 5 % carbon dioxide) is not rebreathed by the device. 5.3.3Connect the breathing circuit to the Sheffield dummy head/torso. 5.3.4Switch on the breathing
45、machine (and with it the auxiliary lung and valves) and operate at 25 cycles per minute and 2,0 l/stroke. 5.3.5Switch on the auxiliary fan (if appropriate) and adjust the air velocity to 0,5 m/s at a point 50 mm in front of the device inlet(s), ensuring that the air is directed away from the device
46、inlet(s). 5.3.6Adjust the carbon dioxide supply into the breathing machine to 2,5 l/min (i.e. a carbon dioxide concentration equivalent to 5 % of the volume of the exhalation stroke of the breathing machine) via a control valve (if fitted), the flow meter, compensating bag and non-return valves. Che
47、ck the carbon dioxide concentration in the exhaled air on a dry basis and adjust as necessary to achieve a stabilised level of 5 %. 5.3.7Draw off a sample of the inhaled air during the inhalation phase by the auxiliary lung set at a rate of 100 ml displacement/stroke (i.e. 5 % of the volume of the i
48、nhalation stroke of the breathing machine). Measure the carbon dioxide concentration in the sample by means of the analyser. Continue the test until a steady value is obtained. Record this value as the uncorrected level of carbon dioxide in the inhaled air. 5.3.8Continue the test and measure the amb
49、ient carbon dioxide level 50 mm in front of the inlet(s) to the device. Take the measure once a stabilised level for carbon dioxide in the inhalation air has been attained. The reference level shall be less than 0,1 %. For devices with an independent air supply, the carbon dioxide level in the supply air shall be less than 0,1 %. 5.3.9Subtract either the laboratory ambient carbon dioxide level or that in the independent air supply, as appropriate, from the measured value in the inhaled air and record this as the corrected carbon dioxide content of the inhaled air. E
链接地址:https://www.31doc.com/p-3739722.html