BS EN 169:2002 pdf download – Personal eye-protection — Filters for welding and related techniques — Transmittance requirements and recommended use 1 Scope This European Standard specifies the scale numbers and transmittance requirements for filters intended to protect operators performing work involving welding, braze-welding, air-arc gouging and plasma jet cutting. It also includes requirements for welding filters with dual scale numbers. The other applicable requirements for these types of filters are given in EN 1 66. The requirements for the frames/mountings to which they are intended to be fitted are given in EN 1 75. Guidance on the selection and use of these filters are given in Annex A. The specifications for welding filters with switchable luminous transmittance are given in EN 379. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. 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. For undated references the latest edition of the publication referred to applies (including amendments). EN 1 65, Personal eye-protection – Vocabulary. EN 1 66, Personal eye-protection – Specifications. EN 1 67:2001 , Personal eye-protection – Optical test methods. ISO/CIE 1 0526:1 999, CIE standard illuminants for colorimetry. ISO/CIE 1 0527:1 991 , CIE standard colorimetric observers. 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 1 65 and the following apply. 3.1 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 4 Designation and identification The complete table of numbering of filters is given in EN 1 66. The marking of oculars and frame is described in EN 1 66. The scale number of these filters comprises only the shade number corresponding to the filter, from 1 ,2 to 1 6 (see Table 1 ). 5 Requirements 5.1 General The requirements of EN 1 66 apply to welding filters. Only those requirements that are different from or supplement...
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