01500340 PDF BRITISH STANDARD BS EN 379 1994 Implementing Amendment No 1 not published separately Specification for Welding filters with switchable luminous transmittance and welding filters with dual[.]
BRITISH STANDARD BS EN 379:1994 Implementing Amendment No not published separately Specification for Welding filters with switchable luminous transmittance and welding filters with dual luminous transmittance The European Standard EN 379:1994, with the incorporation of its amendment A1:1998, has the status of a British Standard ICS 13.340.20 BS EN 379:1994 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: This British Standard, having been prepared under the direction of the Personal Safety Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 May 1994 © BSI 05-1999 The following BSI references relate to the work on this standard: Committee reference PSM/2 Draft for comment 90/44741 DC ISBN 580 21878 Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y France Association franỗaise de normalisation Germany Deutsches Institut für Normung e.V Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugs da Qualidade Spain Asociación Espola de Normalización y Certificación Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd No Date Comments 10073 September 1998 Indicated by a sideline in the margin BS EN 379:1994 Contents Cooperating organizations National foreword Foreword Scope Normative references Definitions Requirements Test methods Marking Information for users Annex A (informative) Guidance on selection and use Table — General requirements Table — Classification of oculars according to the maximum value of P1, P2 or P3 Table — Switching the requirements Table — Assignment of diffusion of light class National annex NA (informative) Committees responsible National annex NB (informative) Cross-references © BSI 05-1999 Page Inside front cover ii 3 3 4 6 Inside back cover Inside back cover i BS EN 379:1994 National foreword This British Standard has been prepared under the direction of the Personal Safety Equipment Standards Policy Committee and is the English language version of EN 379:1994 Specification for welding filters with switchable luminous transmittance and welding filters with dual luminous transmittance, including Amendment 1:1998, published by the European Committee for Standardization (CEN) EN 379 was produced as a result of international discussions in which the United Kingdom took an active part There is no existing equivalent British Standard to EN 379 Attention is drawn to BS EN 169:1992 Specification for filters for personal eye-protection equipment used in welding and similar operations, which specifies the requirements for these more traditional and well-established products 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 comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages to 8, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 05-1999 EUROPEAN STANDARD EN 379 NORME EUROPÉENNE January 1994 + A1 EUROPÄISCHE NORM May 1998 UDC 614.893-086.52:681.7.014.3:621.791-057.21 Supersedes EN 137:1986 ICS 13.340.20 Descriptors: Safety, accident prevention, eyes, filters, welding, specifications, transmittance, dimensions, tests, marking English version Specification for welding filters with switchable luminous transmittance and welding filters with dual luminous transmittance Spécification concernant des filtres de soudage avec facteur de transmission dans le visible commutable et des filtres de soudage avec double facteur de transmission dans le visible Anforderungen an Schweißerschutzfilter mit umschaltbaren Lichttransmissionsgrad und Schweißerschutzfilter mit zwei Lichttransmissionsgraden This European Standard was approved by CEN on 1994-01-07; amendment A1 was approved by CEN on 1998-04-26 CEN members are bound to comply with the CEN/CENELEC 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 Central Secretariat or to any CEN 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 Central Secretariat has the same status as the official versions CEN members 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 CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1994 Copyright reserved to CEN members Ref No EN 379:1994\A1:1998 E EN 379:1994 Foreword Foreword to A1:1998 This European Standard was drawn up by the CEN/TC 85 Technical Committee, Eye protection equipment, of which the Secretariat is held by AFNOR This European Standard has been prepared under a mandate given to CEN by the European Communities and the European Free Trade Association, and supports essential requirements of EC Directive(s) 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 July 1994, and conflicting national standards shall be withdrawn at the latest by July 1994 In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom This Amendment EN 379:1994/A1:1998 to EN 379:1994 has been prepared by Technical Committee CEN/TC 85, Eye-protective equipment, the secretariat of which is held by AFNOR This Amendment to the European Standard EN 379:1994 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 1998, and conflicting national standards shall be withdrawn at the latest by November 1998 This Amendment to the European Standard EN 379:1994 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) According to CEN/CENELEC Internal Regulations, the national standards organizations of the 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 © BSI 05-1999 EN 379:1994 Scope This standard specifies requirements for welding filters which automatically switch their luminous transmittance to a lower value when a welding arc is ignited (referred to as welding filters with switchable scale numbers) The requirements of this standard apply if such a filter is to be used for continuous viewing of the welding process and if it is to be used only during the period when the arc is being ignited This standard also specifies requirements for welding filters with zones of differing luminous transmittance (referred to as welding filters with dual scale number) These filters are used in welders’ eye protectors (as specified in standards in preparation) or are fixed to equipment Normative references EN 165, Personal eye protection — Vocabulary EN 166:1995, Personal eye protection — Fundamental specifications EN 167:1995, Personal eye protection — Optical test methods EN 168, Personal eye protection — Non-optical test methods EN 169:1992, Personal eye protection — Filters for welding and related processes — Transmittance and recommended applications EN 175, Personal eye protection — Equipment for eye and face protection during welding and allied processes (excluding hoods) ISO/CIE 10526, CIE standard colorimetric illuminants Definitions For the purposes of this European Standard the definitions given in EN 165 apply together with the following 3.1 welding filter with switchable scale number 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 3.2 welding filter with dual scale number a protective filter with two different scale numbers (light and dark zones) which are divided into a maximum of three areas of the filter The light zone is used for brief viewing when setting the electrode to the weld and igniting it The dark zone is used for viewing the welding process © BSI 05-1999 3.3 light state scale number the scale number corresponding to the maximum value of luminous transmittance E1 3.4 dark state scale number the scale number corresponding to the minimum value of luminous transmittance Ù2 3.5 switching time the time dependence of luminous transmittance is described by function Ù(t) the switching time ts is defined by the following integral: where: t=0 is the time at which the arc ignites; t = t (Ù = 3Ù2) is the time at which the luminous transmittance falls to times the luminous transmittance in the dark state NOTE In the case of short term exposure to light, the glare is approximately proportional to the 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 transmittance over time and not merely by the initial and final luminous transmittances Requirements 4.1 General requirements Welding filters with switchable scale number and welding filters with dual scale number shall comply with the requirements given in Table 4.2 Particular requirements Where a manufacturer wishes to claim compliance with particular requirements, these requirements shall be as specified in clauses 7.2.2 to 7.2.7 of EN 166:1995 4.3 Additional requirements for welding filters with switchable scale numbers 4.3.1 Power off When tested in accordance with 5.1, welding filters with switchable scale numbers shall be no more than nine scale numbers lighter than the highest scale number in the dark state EN 379:1994 Table — General requirements Property General requirements for welding filters with switchable scale number General requirements for welding filters with dual scale number Spherical, astigmatic and prismatic refractive powers As specified in clause 7.1.2.1.2 of EN 166:1995 As specified in clause 7.1.2.1.2 of EN 166:1995 Variations in luminous transmittance As specified in clause 4.3.3 As specified in clause 7.1.2.2.3 of EN 166:1995 Diffusion of light As specified in clause 4.3.7 As specified in clause 7.1.2.3 of EN 166:1995 Quality of material and surface As specified in clause 7.1.3 EN 166:1995 As specified in clause 7.1.3 of EN 166:1995 Robustness of construction As specified in clause 7.1.4 of EN 166:1995 As specified in clause 7.1.4 of EN 166:1995 Stability at elevated temperature As specified in clause 7.1.5.1 of EN 166:1995 As specified in clause 7.1.5.1 of EN 166:1995 Resistance to ultraviolet radiation As specified in clause 7.1.5.2 of EN 166:1995, but replacing clause 7.1.5.2 b) by clause 4.3.7 of this European standard As specified in clause 7.1.5.2 of EN 166:1995 Resistance to ignition As specified in clause 7.1.8 of EN 166:1995 As specified in clause 7.1.8 of EN 166:1995 Table — Classification of oculars according to the maximum value of P1, P2 or P3 as specified in 4.3.3 Maximum value of P1 or P2 Luminous transmittance in dark state Maximum value of P3 max Class Class Class Class Class Class % % % % % % % % 100 17,9 0,44 0,023 0,0012 17,9 0,44 0,023 0,0012 0,000023 10 15 20 30 10 15 20 30 40 4.3.2 Transmittance 4.3.2.1 The requirements of clauses 4.3.2.2, 4.3.2.3 and 4.3.2.4 shall be satisfied when the transmittances are measured as described in clause of EN 167:1995 using standard Illuminant A 4.3.2.2 The minimum luminous transmittance in the light state shall be 0,16 % when measured at both (– ± 2) °C and (55 ± 2) °C 4.3.2.3 The luminous transmittance requirements given in Table of EN 169:1992 shall apply to both light and dark states The measurements shall be taken at both (– ± 2) °C and (55 ± 2) °C 15 20 30 40 60 20 20 20 20 30 20 20 20 30 40 20 20 30 40 60 4.3.2.4 The spectral transmittance in the ultraviolet and the mean transmittance in the infra-red as given in Table of EN 169:1992 and the additional requirements a) to d) of clause 4.1 of EN 169:1992 required for the dark state shall also apply to the light state The measurements shall be taken at a temperature of (23 ± 5) °C 4.3.3 Variations in luminous transmittance When measured in accordance with Clause 7.2 of EN 167:1995 at a temperature of (23 ± 5) °C the values of P1, P2 and P3 of welding filters with switchable scale number shall not exceed the values in Table for the assigned class This requirement shall apply to both light and dark states 4.3.4 Switching times of welding filters with switchable scale number 4.3.4.1 The switching times shall satisfy either clause 4.3.4.2 or clause 4.3.4.3 for the darkest state © BSI 05-1999 EN 379:1994 Where the requirements of clause 4.3.4.2 are satisfied, no further marking is required Where the requirements of clause 4.3.4.3 are satisfied but the requirements of clause 4.3.4.2 are not satisfied, the warning notice DO NOT USE BELOW 10 °C shall be permanently and legibly marked on the device 4.3.4.2 The switching time shall be measured as described in clause 5.2 at temperatures of (– ± 2) °C and (55 ± 2) °C The switching time given in Table shall not be exceeded at either of these temperatures 4.3.4.3 The switching time shall be measured as described in clause 5.2 at temperatures of (10 ± ) °C and (55 ± 2) °C The switching time given in Table shall not be exceeded at either of these temperatures 4.3.5 Manual control of dark scale number When a manual control of the dark scale number is provided, the means of control shall meet the following requirements a) There shall be a digital indication of the scale number for each position of the manual control b) The scale number in the dark state(s) shall not deviate by more than ±1 from the set scale number with an illuminance of (104 ± 103) lx on the switching light source (5.2.1.1) c) If the range of control is more than five scale numbers, it shall be divided into two sub-ranges with separate manual controls Each manual control shall control a sub-range of no more than scale numbers 4.3.6 Dimensions The minimum dimensions of the viewing area when mounted in appropriate equipment shall be 90 mm by 35 mm 4.3.7 Diffusion of light The diffusion of light shall be measured in accordance with one of the reference methods described in clause of EN 167:1995 The maximum value of the reduced luminance factor in the light or dark state shall determine the diffusion of light class of the welding filter as shown in Table 4.4.2 Transmittance 4.4.2.1 The requirements of clauses 4.4.2.2 and 4.4.2.3 shall be satisfied when the transmittances are measured as described in clause of EN 167:1995 at a temperature of (23 ± 5) °C 4.4.2.2 The minimum luminous transmittance in the light zone shall be 0,16 % 4.4.2.3 The spectral transmittance in the ultraviolet and the mean transmittance in the infra-red given in Table of EN 169:1992 and the additional requirements a) to c) in clause 4.1 of EN 169:1992 required for the dark zone shall also apply to the light zone 4.4.3 Dimensions These shall be as given in clause 7.1.1 of EN 166:1995 The dark zone shall be at least 25 mm vertical depth across the horizontal length Any region separating the light and dark zones shall not exceed mm vertical depth across the horizontal length This region shall be opaque Test methods 5.1 Power off test Measure the luminous transmittance with the device in the dark state Disconnect all power supplies Repeat the measurement of the luminous transmittance 5.2 Measurement of switching time 5.2.1 Test equipment 5.2.1.1 Switching light source This consists of a high pressure xenon lamp as a source of radiation, producing an illuminance of (104 ± 103) lx at the test specimen 5.2.1.2 High speed optical shutter A device capable of switching on the switching light source at a speed meeting the requirements of 5.2.2 5.2.1.3 Measurement light source A source of illuminant A (see ISO/CIE 10526) 4.4 Additional requirements for welding filters with dual scale number 4.4.1 Difference in scale number The difference in scale number between the light and dark zones shall be no more than five © BSI 05-1999 EN 379:1994 Table — Switching time requirements Dark shade Light shade 1,7 2,5 Switching time ms 300 400 500 700 000 No requirement No requirement 100 150 200 300 500 000 No requirement 40 50 70 100 200 400 700 10 20 20 30 40 70 100 300 11 10 15 30 50 100 12 10 20 40 13 0,8 1,5 10 14 0,3 0,4 0,5 0,7 15 0,10 0,15 0,2 0,3 0,5 16 0,04 0,05 0,07 0,1 0,2 0,4 0,7 Table — Assignment of diffusion of light class Diffusion of light class Maximum value reduced luminance factor (cd/m2)/lx 1,0 2,0 3,0 5.2.1.4 Light detector and recording apparatus A device capable of detecting and recording the light from the measurement light source transmitted by the welding filter 5.2.2 Performance of test equipment Check that when the light beam is switched by the high speed shutter, the rise time between 10 % and 90 % of the light transmitted by the shutter is no greater than 10 % of the switching time required for the scale number difference to be measured See Table 5.2.3 Measurement Maintain the test specimen at the appropriate test temperature for a minimum of h before testing and during the period of the test Set up the measurement light source (5.2.1.3) and the test specimen so that the plane of the test specimen and the light detector (5.2.1.4) are at (90 ± 5) ° to the measurement beam With the switching light source on, switch the high speed shutter to allow the light through to the test specimen, thereby switching the test specimen to its dark state Record the measurement light transmitted through the test specimen during the switching period 5.2.4 Calculation Calculate the switching time ts from the equation given in 3.5, with t = as the time when the illuminance at the test specimen reaches about half the value given in 5.2.1.1 Marking This shall be as specified in clause of EN 166:1995 with the following additional details 6.1 Welding filter with switchable scale number The light state scale number and the dark state scale number(s), separated by an oblique stroke, shall be used instead of the single scale number Where the dark state is manually controlled, the limits of the range of attainable scale numbers shall be marked separated by a hyphen The diffusion of light class and uniformity of luminous transmittance class shall be added, separated by oblique strokes, to the optical class as specified in EN 166:1995, clause 7.1.2.1.2 e.g 1/3/2 NOTE Examples of marking are as follows a) A simple device with one light state and one dark state: 5/11 b) A device with one light state and manual control of the dark state in one range: 4/9-13 c) A device with one light state and manual control of the dark state in two ranges: 4/5-7/10-13 © BSI 05-1999 EN 379:1994 If appropriate, the symbols for compliance with particular requirements of EN 166 (see clause 4.2) shall be given Information for users Where appropriate, the symbols for compliance with particular requirements of EN 166 (see 4.2) and the warning note “Do not use below 10 °C” (see clause 4.3.4.1) shall be added 6.2 Welding filter with dual shade The scale number of the light zone(s) and the scale number of the dark zone, separated by a plus sign, shall be used instead of the single scale number, e.g + 10 © BSI 05-1999 Each welding filter shall be accompanied by instructions for use as specified in clause 10 of EN 166:1995, together with the following additional information: a) information on the recognition of failure; b) information on the intervals at which components or the complete filter should be changed; c) for dual shade filters: A warning to the effect that the welding process should only be observed through the dark shade; d) where the device does not meet the performance requirements at – °C (see clause 4.3.4) a warning to the effect that it should not be used below 10 °C e) any optional requirements given in EN 166 which the device satisfies (for example, protection against high speed particles) EN 379:1994 Annex A (informative) Guidance on selection and use Refer to Annex A of EN 169:1992 © BSI 05-1999 BS EN 379:1994 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Personal Safety Equipment Standards Policy Committee (PSM/-) to Technical Committee PSM/2 upon which the following bodies were represented: Association for Consumer Research British College of Optometrists British Foundry Association British Glass Manufacturers’ Confederation British Non-Ferrous Metals Federation British Plastics Federation British Steel Corporation City University Department of Trade and Industry (National Physical Laboratory) Electricity Industry in the United Kingdom Engineering Equipment and Materials Users’ Association Federation of Manufacturing Opticians Flat Glass Manufacturers’ Association Health and Safety Executive Industrial Safety (Protective Equipment) Manufacturers’ Association Institution of Gas Engineers Institution of Mechanical Engineers Institution of Occupational Safety and Health Light Metals Founders’ Association Manufacturing Science Finance Ministry of Defence National Radiological Protection Board Safety Equipment Distributors’ Association Steel Casting Research and Trade Association Trades Union Congress Zinc Alloy Die Casters’ Association National annex NB (informative) Cross-references Publication referred to Corresponding British Standard EN 165:1986 BS 6967:1988 Glossary of terms for personal eye-protection EN 169:1992 BS EN 169: 1992:Specification for filters for personal eye-protection equipment used in welding and similar operations © BSI 05-1999 BS EN 379:1994 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to 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