DIN EN 169 pdf free download

DIN EN 169 pdf free download. Filters for welding and related techniques.
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 165, Personal eye-protection – Vocabulary. EN 166, Personal eye-protection – Specifications. EN 167:2001, Personal eye-protection – Optical test methods. ISO/CIE 10526:1999, CIE standard iluminants for colorimetry. ISO/CIE 10527:1991, CIE standard colorimetric observers.
3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 165 and the following apply. 3.1 welding filter with dual scale number a protective filter with two different scale numbers (ight 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 166. The marking of oculars and frame is described in EN 166. The scale number of these filters comprises only the shade number corresponding to the filter, from 1,2 to 16 (see Table 1). 5 Requirements 5.1 General The requirements of EN 166 apply to welding filters. Only those requirements that are different from or supplement the EN 166 specifications are given in this European Standard. 5.2 Transmittance requirements The definitions of transmittances are given in EN 165. The determination of luminous transmittance is described in EN 167. The transmittance requirements for filters used in welding and related techniques are given in Table 1. 5.3 Oculars with enhanced colour recognition (optional) Between 500 nm and 650 nm, the spectral transmittance shall be not less than 0,2 w. The relative visual attenuation quotient Q, for signal lights red, yellow, green and blue shall be not less than 0,8. . 5.4 Oculars with enhanced reflectance in the infrared (optional) Oculars which are claimed to have enhanced reflectance in the infrared shall have a mean spectral reflectance greater than 60 % within the wavelength range 780 nm to 2 000 nm when measured in accordance with EN 167:2001, clause 8. 5.5 Additional requirements for welding filters with dual scale number 5.5.1 Difference in scale number The difference in scale number between the light and dark zones shall be no more than five. 5.5.2 Transmittance 5.5.2.1 The requirements of 5.5.2.2 and 5.5.2.3 shall be satisfied when the transmittances are measured in accordance with EN 167. 5.5.2.2 The minimum luminous transmittance in the light zone shall be 0,16 %. 5.5.2.3 The spectral transmittance in the ultraviolet and the mean transmittance in the infrared given in Table 1 and the additional requirements a) to d) in 5.2 required for the dark zone shall also apply to the light zone.5.5.3 Dimensions 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 2 mm vertical depth across the horizontal length. This region shall provide at least the same protection against radiation as the dark zone.DIN EN 169 pdf download.