1、BRITISH STANDARD 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 ofa British Standard ICs 13.340.30 BS EN 13274-612002 Wk present to the responsible European committee any enquir
2、ies on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cr oss-r e fer enc e
3、s 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 “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue
4、. 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 comprise
5、s 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. O BSI 26 February 2002 ISBN O 580 39195 7 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13274-6 December 20
6、01 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 - Mthodes dessai - Partie 6: Dtermination de la teneur en dioxyde de carbone de lair inhal Atemschutzgerte -
7、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 CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a na
8、tional 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 member. This European Standard exists in three official versions (English, French, German). A version in an
9、y 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 members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany
10、, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2001 CEN All righ
11、ts 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) Contents page Foreword 3 Introduction . 4 1 2 3 4 5 5.1 5.2 5.2.1 5.2.2 5.2.3 5.2.4 5.2.5 5.2.6 5.3 Scope 4 Normative references 4 Terms and definitions 4 Prere
12、quisites 4 Test method 5 Principle 5 Test equipment 5 General 5 Breathing machine . 5 Carbon dioxide sampling arrangement . 5 Sheffield headltorso 5 Auxiliary fan 6 Carbon dioxide sampling of ambient air . 6 Procedure for measurement of carbon dioxide in inhalation air 6 Annex A (normative) Fitting
13、procedure for hoods (with or without head harness) which seal around the neck . IO A.l Introduction 10 A.2 Principle 10 A.3 Apparatus . IO A.3.1 Sheffield dummy headltorso . 10 A.3.2 Stand and elastic string 10 A.3.3 Adjustable collar 10 A.4 Procedure . II Annex B (informative) Test results - Uncert
14、ainty of measurement 14 Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives 15 2 EN 13274-6:2001 (E) Foreword This European Standard has been prepared by Technical Committee CEN/TC 79 “Respiratory protective devices“, the se
15、cretariat 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 be withdrawn at the latest by June 2002. This European Standa
16、rd 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, which is an integral part of this standard. This is one of se
17、veral 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: Determination of carbon dioxide content of the inhalation air
18、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 CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European St
19、andard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 3 EN 13274-6:2001 (E) Introduction This standard is intended as a supplement to the specific dev
20、ice 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 device standard. 1 Scope This European Standard specifies the tes
21、t 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 publications. These normative references are cited at the appropriat
22、e 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. For undated references the latest edition of the publicatio
23、n 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, together with the following: 3.1 ambient conditions atmosph
24、ere 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 equal to 95 % 4 Prerequisites In order to implement this part
25、 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/torso; - method of sealing facepiece to dummy head/torso (i
26、f appropriate); 4 EN 13274-6:2001 (E) - 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 device is fitted, as described by the device standard, to a
27、 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 carbon dioxide is supplied at a specified rate from a breathin
28、g 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 dioxide in the inhaled air. 5.2 Test equipment 5.2.1 Genera
29、l 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 shall be carried out at ambient conditions. 5.2.2 Breathing mac
30、hine 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 good seal on closing and that the timing of their action allow
31、s 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 of the inhalation volume of the breathing machine) during th
32、e 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. It is therefore important that these two volumes are equal. T
33、he 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 the circuit upstream of the sample point. The carbon dioxid
34、e 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 headltorso Sheffield head fitted with concentric tubes and central carbon dioxide samplin
35、g 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). 5 EN 13274-6:2001 (E) The end of the concentric tubes is lev
36、el 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 fan In order to ensure that the device inhales laboratory ai
37、r 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 in front of the device inlet. NOTE air supply (e.g. compress
38、ed airline devices). The auxiliary fan arrangement is not required when carrying out tests on devices which have their own independent 5.2.6 Carbon dioxide sampling of ambient air It is necessary to assess the level of carbon dioxide in the laboratory air in the immediate vicinity of the device inle
39、t. 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 the same sample rate as used to measure the carbon dioxide
40、in the inhalation air. 5.3 Procedure for measurement of carbon dioxide in inhalation air 5.3.1 Confirm whether the device standard requires breathing machine settings and exhaled carbon dioxide levels which lead to sample volumes different to those specified in the following procedure. An example of
41、 the calculation necessary for different requirements is given in 5.3.10. 5.3.2 Fit 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 condition defined in the device standard. Ensure as far
42、as possible that exhaled air from the device (which during subsequent testing will contain 5 % carbon dioxide) is not rebreathed by the device. 5.3.3 Connect the breathing circuit to the Sheffield dummy head/torso. 5.3.4 minute and 2,O ktroke. Switch on the breathing machine (and with it the auxilia
43、ry lung and valves) and operate at 25 cycles per 5.3.5 the device inlet(s), ensuring that the air is directed away from the device inlet(s). Switch on the auxiliary fan (if appropriate) and adjust the air velocity to 0,5 m/s at a point 50 mm in front of 5.3.6 Adjust the carbon dioxide supply into th
44、e breathing machine to 2,5 I/min (.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. Check the carbon dioxide concentration in the exhaled air o
45、n a dry basis and adjust as necessary to achieve a stabilised level of 5 %. 5.3.7 displacementktroke (.e. 5 % of the volume of the inhalation stroke of the breathing machine). Draw off a sample of the inhaled air during the inhalation phase by the auxiliary lung set at a rate of 100 ml Measure the c
46、arbon 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. 5.3.8 Continue the test and measure the ambient carbon dioxide level 50 mm in front of the inlet(s)
47、 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,l %. For devices with an independent air supply, the carbon dioxide level in the supply air shall be less than 0,l %. 5.3.9 Subtract either th
48、e 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. 6 EN 13274-6:2001 (E) 5.3.1 O Example of calculation for alternative requirements. B
49、reathing machine setting Exhaled carbon dioxide 43 % Volume of input CO2/ stroke Flow rate of CO2 Inhalation sample volume (auxiliary lung displacement) 20 cycles per minute and 1,75 I/stroke = 43 % of 1,75 I = 0,07875 I = 0,07875 x 20 cycleslmin. = 1,575 Ilmin = 43 % of 1,75 I = 78,75 ml 7 EN 13274-6:2001 (E) Key 1 Breathing machine 2 Auxiliary lung 3 Non-return valve 4 Flowmeter 5 Compensator 6 Carbon dioxide analyser 7 Solenoid valve 8 Dummyhead 9 10 Carbon dioxide absorber a Carbon dioxide supply Sampling tube for inhalation air Figure 1 - Schematic of a typical arrangem
