1、BS EN 12254:2010ICS 13.280; 31.260NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDScreens for laserworking places Safety requirementsand testingIncorporatingcorrigendumDecember 2011National forewordThis British Standard is the UK implementation of EN 12254:2010,
2、 incorporating corrigendum December 2011. It supersedes BS EN 12254:1998+A2:2008, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PH/2, Eye protection.A list of organizations represented on this committee can be obtained on request to its secretary.Thi
3、s publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 12254:2010This British Standardwas published under theauthority of the Standa
4、rdsPolicy and StrategyCommittee on 30 April2010 The British Standards Institution 2013. Published by BSI Standards Limited 2013Amendments/corrigenda issued since publicationDate Comments 31 May 2013 Implementation of CEN corrigendum December 2011: Subclause B.1, paragraph 3 modifiedISBN 978 0 580 77
5、855 1EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12254 March 2010 ICS 13.280 Incorporating corrigendum December 2011 English Version Screens for laser working places - Safety requirements and testing crans pour postes de travail au laser - Exigences et essais de scurit Abschirmungen an Lase
6、rarbeitspltzen - Sicherheitstechnische Anforderungen und Prfung This European Standard was approved by CEN on 20 February 2010. 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
7、 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 official versions (English, French, German). A version in any other lan
8、guage 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 Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Esto
9、nia, 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 COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EURO
10、PISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12254:2010: EBS EN 12254:2010EN 12254:2010 (E) 2 Contents Page Foreword 31 Scope 42 Normative refe
11、rences 43 Terms and definitions .54 Requirements .54.1 Spectral transmittance 54.2 Resistance to laser radiation 54.3 Stability to UV radiation 54.4 Stability to elevated temperature .54.5 Mechanical strength 54.6 Resistance to ignition .65 Testing 65.1 General 65.2 Spectral transmittance 65.3 Resis
12、tance to laser radiation 65.4 Stability to UV radiation and stability at elevated temperature 85.4.1 Stability to UV radiation 85.4.2 Stability at elevated temperature .85.5 Mechanical strength 85.5.1 Flexible screens .85.5.2 Inflexible screens .95.5.3 Resistance to ignition .96 Marking 107 Informat
13、ion supplied by the manufacturer 11Annex A (informative) Principles 12A.1 Limit values . 12A.2 Time base used to calculate the MPE values 12A.3 Resistance to laser radiation . 12A.4 Example test report 14Annex B (informative) Selection of screens for laser working places 16B.1 General . 16B.2 Pulsed
14、 lasers . 16B.3 Caution for users of laser safety screens 17Annex C (informative) Significant technical changes between this European Standard and the previous edition 18Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC . 19B
15、ibliography . 20BS EN 12254:2010EN 12254:2010 (E) 3 Foreword This document (EN 12254:2010) 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 national standard, either by publ
16、ication of an identical text or by endorsement, at the latest by September 2010, and conflicting national standards shall be withdrawn at the latest by September 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CEN
17、ELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12254:1998+A2:2008. 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 EC
18、 Directive(s). For relationship with EC Directive(s), see informative Annex ZA, which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgi
19、um, Bulgaria, Croatia, 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 the United Kingdom. BS EN 1225
20、4:2010EN 12254:2010 (E) 4 1 Scope This European Standard specifies functional requirements and a product labelling applicable to temporary and permanent passive guards (in the following called screens) for protection against laser radiation. This standard includes test methods for testing functional
21、 performance and the specification of the user documentation to be supplied with the product. The screens are designed to protect the user from: unintentional exposure to direct and/or diffuse laser radiation; a time limited exposure to laser radiation, based on the functional requirements determine
22、d by risk assessment. This European Standard applies to supervised screens for installations in working places at which laser radiation up to a maximum mean power of 100 W or single pulse energy of 30 J occurs within the spectral range between 180 nm (0,18 m) and 106nm (1 000 m). This European Stand
23、ard applies to the protection against laser radiation only. This standard does not apply to other hazards including hazards from secondary radiation that can arise during, for example, material processing. This European Standard gives guidance on how to select such screens. Laser enclosures and hous
24、ings that are supplied as part of the laser product or are supplied to be fitted to a laser system to form a laser product (according to EN 60825-1) are not considered to be within the scope of the standard. 2 Normative references The following referenced documents are indispensable for the applicat
25、ion 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 165:2005, Personal eye-protection Vocabulary EN 166:2001, Personal eye-protection Specifications EN 168:2001, Perso
26、nal eye-protection Non-optical test methods EN 1598:1997, Health and safety in welding and allied processes Transparent welding curtains, strips and screens for arc welding processes EN 1598:1997/A1:2001, Health and safety in welding and allied processes Transparent welding curtains, strips and scre
27、ens for arc welding processes EN 60825-1:2007, Safety of laser products Part 1: Equipment classification and requirements (IEC 60825-1:2007) EN 60825-4:2006, Safety of laser products Part 4: Laser guards (IEC 60825-4:2006) IEC 60050-845:1987, International Electrotechnical Vocabulary Chapter 845: Li
28、ghting BS EN 12254:2010EN 12254:2010 (E) 5 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 165:2005, EN 60825-1:2007, EN 60825-4:2006 and IEC 60050-845:1987 apply. 4 Requirements 4.1 Spectral transmittance The relationship between spectral transmittan
29、ce at the laser wavelength and resistance to laser radiation is based on the maximum permissible exposure (MPE) shown in EN 60825-1. To simplify product specification, tests are conducted for laser test conditions described in Table 1. The laser test conditions are referred to by the symbols D, I, R
30、 and M. Table 1 Duration of test applicable to screens for laser working places Test condition (corresponding laser designation) Pulse duration s Number of pulses D (continuous wave (CW) laser) 100 1 I (pulsed laser) 10-6to 10-21 000 R (Giant pulsed laser) 10-9to 10-61 000 M (Mode-coupled pulsed las
31、er) 10-9100 000 NOTE The listed pulse durations are values of typical lasers. A laser with a pulse length in this range of values is recommended for testing. Total exposure time for each test should be about 100 s. 4.2 Resistance to laser radiation The screens shall not lose their protective propert
32、ies and shall stay within the scale number under effect of laser radiation with the power and energy density as specified in Table 2 including induced transmission (reversible bleaching). 4.3 Stability to UV radiation When exposed to ultraviolet radiation in accordance with 5.4.1, the spectral trans
33、mittance at the laser wavelengths shall not exceed the maximum permissible spectral transmittance of the corresponding scale number. 4.4 Stability to elevated temperature After exposure to elevated temperature in accordance with 5.4.2, the requirements of 4.1 to 4.2 shall be met. 4.5 Mechanical stre
34、ngth Flexible screens shall withstand for 10 s a tensile stress of 15 N/mm2 when tested according to 5.5.1. After this test, no sample shall be torn. Inflexible screens shall be robust in accordance to 7.1.4.2 of EN 166:2001. Fixing systems of screens shall be designed so that they remain attached t
35、o the screens or to the machinery when the screens are removed. BS EN 12254:2010EN 12254:2010 (E) 6 4.6 Resistance to ignition Flexible screens shall satisfy the requirements of 4.4 of EN 1598:1997 when tested in accordance with 4.4 of EN 1598:1997 and EN 1598:1997/A1:2001. Inflexible screens shall
36、meet requirements according to 7.1.7 of EN 166:2001. 5 Testing 5.1 General The testing schedule in Table 3 applies to testing of flexible and inflexible screens. At least 18 samples are required for testing. If testing for several wavelengths (wavelength ranges) or testing conditions according to Ta
37、bles 1 and 3 has to be done, more samples can be necessary. 5.2 Spectral transmittance The spectral transmittance shall be determined at normal incidence. Screens with angular-dependent transmittance shall be measured at angles of incidence between 0 and 90 with polarised radiation. In this case, th
38、e scale number results from the highest of the spectral transmittance values measured. 5.3 Resistance to laser radiation Testing shall be carried out with laser radiation of the specific wavelength(s) and the power and energy densities as indicated in Table 2. Spectral transmittance at the laser wav
39、elength shall be measured during the exposure to laser radiation. BS EN 12254:2010EN 12254:2010 (E) 7 Table 2 Scale numbers of screens for laser working places (maximum spectral transmittance and resistance to laser radiation) Maximum spectral transmittance at the laser wavelength Mean power (E) and
40、 single pulse energy density (H) for testing protective properties and resistance to laser radiation in the wavelength range 180 nm to 315 nm 315 nm 1 050 nm 315 nm to to to 1 400 nm to 106 nm 1 050 nm 1 400 nm 1 400 nm For test condition/pulse duration in s (see Table 1) Scale number () D I, R M D
41、D I, R M D I, R M 0,25 10-9 to 0,25 109 510-3 210-3 109to 0,01 109 0,1 10-9to 0,1 10-9EDHI, REMEDEDHI, RHMEDHI, REMW/m2J/m2W/m2W/m2W/m2J/m2J/m2W/m2J/m2W/m2AB1 1010,01 31023101110 2,51020,05 0,0015 1041031012AB2 1020,1 3103310121022,51030,5 0,015 1051041013AB3 1031 3104310131032,51045 0,15 1061051014
42、AB4 10410 3105310141042,510550 1,5 1071061015AB5 1051023106310151052,5106510215 1081071016AB6 1061033107310161062,510751031,51021091081017AB7 1071043108310171072,510851041,510310101091018AB8 1081053109310181082,510951051,5104101110101019AB9 10910631010310191092,5101051061,5105101210111020 AB10 1010
43、107 31011 31020 10102,51011 5107 1,5106 1013 1012 1021The values of energy density (H) in Table 2 for testing the resistance against laser radiation for pulsed lasers (I, R, M) should be multiplied with the factor N-1/4, where N is the number of pulses in 100 s. For pulsed lasers, testing should be
44、done with low repetition rates ( 25 Hz). If not possible, the energy density used for testing shall be given and the product shall be marked in accordance with Clause 6. The diameter d63of the laser beam during this test shall be (1 0,1) mm. The testing period is indicated in Table 1. For pulse dura
45、tions 60 %, and then stored for at least 2 h at room temperature (23 5) C. 5.5 Mechanical strength 5.5.1 Flexible screens 5.5.1.1 Testing machine The tensile testing machine shall be power-driven and capable of maintaining the appropriate rate of grip separation as specified in 5.5.1.3. The testing
46、machine shall be equipped with the following devices. Grips for holding the test sample, one being fixed and the other movable. BS EN 12254:2010EN 12254:2010 (E) 9 The grips shall be self-aligning in that they are attached to the machine in such a way that they move freely into alignment as soon as
47、any load is applied so that the long axis of the test sample coincides with the direction of pull through the centre line of the grip assembly. The test sample shall be held in such a way that slip relative to the grip is prevented as far as possible and this shall preferably be effected with the ty
48、pe of grip which maintains or increases pressure on the test sample as the force applied to the test sample increases. The clamping system shall not cause premature fracture at the grips. Load indicator incorporating a suitable load-indicating mechanism capable of showing the total tensile load carr
49、ied by the test sample when held by the grips. 5.5.1.2 Test samples Test samples 7 to 9 (10 mm wide and 150 mm long) are cut from the screen. Test samples 10 to 12 (10 mm wide and 150 mm long) are cut from the screen, the longer dimension being perpendicular to the longer dimension of samples 7 to 9 when cutting them from the screen. Determine
