1、BRITISH STANDARD BS EN 379:2003 Personal eye-protection Automatic welding filters ICS 13.340.20 +A1:2009National foreword This British Standard is the UK implementation of EN 379:2003+A1:2009. It supersedes BS EN 379:2003 which is withdrawn. The start and finish of text introduced or altered by amen
2、dment is indicated in the text by tags. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by !“. The UK participation in its preparation was entrusted by Technical Committee PH/2, Eye protection, to Subcommittee PH/2
3、/4, Welding, ultraviolet and infrared filters. A list of organizations represented on this subcommittee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance
4、with a British Standard cannot confer immunity from legal obligations. BS EN 379:2003+A1:2009 This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 24 September 2003 BSI 2009 Amendments/corrigenda issued since publication Date Comments 31 October
5、2009 Implementation of CEN amendment A1:2009 ISBN 978 0 580 59742 8 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 379:2003+A1 April 2009 ICS 13.340.20 Supersedes EN 379:2003 English Version Personal eye-protection - Automatic welding filters Protection individuelle de loeil - Filtres de souda
6、ge automatique Persnlicher Augenschutz - Automatische Schweierschutzfilter This European Standard was approved by CEN on 1 August 2003 and includes Amendment 1 approved by CEN on 24 February 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condition
7、s 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 CEN Management Centre or to any CEN member. This European Standard exists in three of
8、ficial 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 CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austr
9、ia, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMI
10、TTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 379:2003+A1:2009: EEN 379:2003+A1:2009
11、 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Requirements .6 4.1 General requirements 6 4.2 Particular requirements 6 4.3 Additional requirements .6 4.3.1 Power off .6 4.3.2 Transmittance 6 4.3.3 Variations in luminous transmittance7 4.3.4 Switching
12、 time 8 4.3.5 Manual control of dark scale number 8 4.3.6 Diffusion of light 8 4.3.7 Angle dependence of luminous transmittance ! ! ! !deleted text“ “ “ “ .9 4.4 Spectral sensitivity of welding filters with automatic scale number setting .9 4.5 Viewing area .9 5 Test methods . 10 5.1 Power off test
13、10 5.2 Measurement of switching time 10 5.2.1 Test equipment . 10 5.2.2 Performance of test equipment . 10 5.2.3 Measurement . 10 5.2.4 Calculation . 10 5.3 Scale number setting of welding filters with automatic scale number setting 10 5.3.1 Test equipment . 10 5.3.2 Measurement of the scale number
14、setting . 11 5.4 Spectral sensitivity of welding filters with automatic scale number setting 11 5.4.1 General . 11 5.4.2 Method using monochromatic radiation 11 5.4.3 Method using cut-off filters . 11 5.5 Angle dependence of luminous transmittance 12 5.6 Test schedule for type examination 13 6 Marki
15、ng 14 6.1 General . 14 6.2 Automatic welding filters and automatic welding filters with manual scale number setting . 14 6.3 Welding filter with automatic scale number setting 14 7 Information to be supplied by the manufacturer . 15 Annex A (informative) Guidance on selection and use 16 A.1 General
16、. 16 A.1.1 Scale numbers to be used for gas welding and braze welding . 16 A.1.2 Scale numbers to be used for oxygen cutting . 17 A.1.3 Scale numbers to be used for plasma jet cutting 17 A.1.4 Scale numbers to be used for electric arc welding or air-arc gouging . 17 A.1.5 Scale numbers of filters to
17、 be used by welders assistants 17 A.2 Remarks . 19 Annex B (informative) Uncertainty of measurement and results interpretation 20 B.1 Test report and uncertainty of measurement 20 Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Dir
18、ectives . 22 Bibliography . 23 BS EN 379:2003+A1:2009EN 379:2003+A1:2009 (E) 3 Foreword This document (EN 379:2003+A1:2009) has been prepared by Technical Committee CEN/TC 85 “Eye-protective equipment”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a
19、national standard, either by publication of an identical text or by endorsement, at the latest by October 2009, and conflicting national standards shall be withdrawn at the latest by October 2009. This document includes Amendment 1, approved by CEN on 2009-02-24. This document supersedes !EN 379:200
20、3“. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! “. This document 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. For relation
21、ship with EU Directive, see informative Annex ZA, which is an integral part of this document. Annexes A and B are informative. In the revision of this European standard, and that of EN 169, which was performed concurrently, it was decided to remove from EN 379 welding filters with dual scale numbers
22、 and include them within EN 169. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, H
23、ungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. BS EN 379:2003+A1:2009EN 379:2003+A1:2009 (E) 4 1 Scope This European standard specifies requirements for automati
24、c welding filters which switch their luminous transmittance to a lower predetermined value when a welding arc is ignited (referred to as welding filters with switchable scale numbers). It also specifies requirements for automatic welding filters which switch their luminous transmittance to a lower v
25、alue, where the lower value of luminous transmittance is set automatically in dependence on the illuminance generated by the welding arc (referred to as welding filters with automatic scale number setting). The requirements of this standard apply if such a filter is to be used for continuous viewing
26、 of the welding process, (including gas welding and cutting), and if it is to be used only during the period when the arc is being ignited. These filters are used in welders eye protectors or are fixed to equipment. If they are to be used in welders eye protectors, other applicable requirements for
27、these types of filters are given in EN 166. The requirements for the frames/mountings to which they are intended to be fitted are given in EN 175. Guidance on the selection and use of these filters is given in annex A. The specifications for welding filters without switchable luminous transmittance
28、are given in EN 169. 2 Normative references !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.“ !EN
29、 165:2005“, Personal eye-protection Vocabulary EN 166:2001, Personal eye-protection Specifications EN 167:2001, Personal eye-protection Optical test methods !deleted text“ EN 169:2002 !deleted text“, Personal eye-protection Filters for welding and related techniques Transmittance requirements and re
30、commended use ISO 9211-2:1994, Optics and optical instruments Optical coatings Part 2: Optical properties !ISO 11664-2:2007, Colorimetry Part 2: CIE standard illuminants“ 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in !EN 165:2005“ and the foll
31、owing apply. 3.1 automatic welding filter a protective filter which automatically switches its scale number from a lower value (light state scale number) to a higher value (dark state scale number) when the welding arc is ignited 3.1.1 automatic welding filter with manual scale number setting a prot
32、ective filter which automatically switches its scale number from a lower value (light state scale number) to a higher value (dark state scale number) selected by the user when the welding arc is ignited BS EN 379:2003+A1:2009EN 379:2003+A1:2009 (E) 5 3.1.2 automatic welding filter with automatic sca
33、le number setting a welding filter with switchable scale number, in which the dark state scale number depends upon the illuminance generated by the welding arc. 3.2 light state scale number the scale number corresponding to the maximum value of luminous transmittance 1 (see Figure 1) 5 10 11 12 13 1
34、4 1- d- 2Light state Lightest dark state Intermediate dark state Darkest state scale number scale number scale number Figure 1 - Example showing the meaning of the terms in the case of an automatic welding filter with a light state scale number of 5 and dark state scale numbers between 10 and 14 3.3
35、 dark state scale number the scale number corresponding to the value of the luminous transmittance dreached after the ignition of the welding arc by an automatic welding filter (see Figure 1) 3.4 darkest state scale number the highest scale number corresponding to the minimum value of luminous trans
36、mittance 2of an automatic welding filter claimed by the manufacturer (see Figure 1) 3.5 switching time the switching time t sof an automatic welding filter is defined by the following integral: = = = = ) 3 ) ( ( 0 1 s 2 d ) ( 1 t t t t t t t where t = 0 is the time at which the arc ignites; (t) is l
37、uminous transmittance at a time t after the ignition of the welding arc; t = t ( (t)=3 2 ) is the time at which the luminous transmittance falls to 3 times the luminous transmittance in the darkest state. NOTE In the case of short term exposure to light, the glare is approximately proportional to th
38、e product of the illuminance at the eye and time. The time relationship of the darkening process can be very different depending on the construction of the welding filter with switchable scale number. It is therefore appropriate to define the switching time as an integral of the luminous transmittan
39、ce over time and not merely by the initial and final luminous transmittances. BS EN 379:2003+A1:2009EN 379:2003+A1:2009 (E) 6 3.6 cut-off filter a filter with a range of low spectral transmittance (cut-off band) followed by a range with high spectral transmittance (pass-band) or vice versa, with pro
40、perties described according to ISO 9211-2:1994. ! ! ! !3.7 viewing area area not opaque used by the wearer to view the task and meets the requirements of the stated filter scale number“ 4 Requirements 4.1 General requirements Automatic welding filters shall comply with requirements given in Table 1.
41、 These requirements shall be met for the highest possible scale number as may be set under either automatic setting (including manual offset) or manual setting. Table 1 - General requirements Property Requirement Spherical, astigmatic and prismatic refractive powers EN 166:2001, 7.1.2.1.2 Luminous t
42、ransmittance EN 169:2002, Table 1 Variations in luminous transmittance 4.3.3 Spectral transmittance EN 169:2002, Table 1 Diffusion of light 4.3.6 Quality of material and surface EN 166:2001, 7.1.3 Robustness of construction EN 166:2001, 7.1.4 Resistance to ultraviolet radiation EN 166:2001, 7.1.5.2,
43、 but replacing 7.1.5.2 b) by 4.3.6 of this European standard Resistance to ignition EN 166:2001, 7.1.7 4.2 Particular requirements Where a manufacturer wishes to claim compliance with particular requirements, these requirements shall be as specified in EN 166:2001, 7.2.2 to 7.2.8 and 7.3. 4.3 Additi
44、onal requirements 4.3.1 Power off When tested according to 5.1, automatic welding filters shall be no more than nine scale numbers lighter than the darkest state scale number. 4.3.2 Transmittance 4.3.2.1 The requirements of 4.3.2.2, 4.3.2.3 and 4.3.2.4 shall be satisfied when the transmittances are
45、measured as described in EN 167:2001, 6, using standard illuminant A. 4.3.2.2 The minimum luminous transmittance in the light state shall be 0,16% when measured at both (-5 2) o C and (55 2) o C. BS EN 379:2003+A1:2009EN 379:2003+A1:2009 (E) 7 4.3.2.3 The luminous transmittance requirements given in
46、 EN 169:2002, Table 1, shall apply to both light and dark states ( 1, d and 2 ). The measurements shall be taken at both (- 5 2) o C and (55 2) o C. 4.3.2.4 The spectral transmittance in the ultraviolet and the mean transmittance in the infrared, as given in EN 169:2002, Table 1, and the additional
47、requirements (a) to (d) of EN 169:2002, 5.2, required for the darkest state scale number, shall also apply to all other states. The measurements shall be taken at a temperature of (23 5) o C. 4.3.2.5 In the case of welding filters with automatic scale number setting, this setting of the dark state s
48、cale number shall meet the following requirements: a) The dark state scale number N(E v ) shall depend on the illuminance E vas follows: ) lx / log( 25 , 2 93 , 2 ) ( v v E E N + = Some values calculated from this formula are given as examples in Table 2, for scale numbers between 8 and 14: Table 2 - Dark state scale number Dark state scale number Scale number N 8 9 10 11 12 13 14 Illuminance / lx 180 500
