EN 169:2002

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Designation and identification
5 Requirements
  5.1 General
  5.2 Transmittance requirements
  5.3 Oculars with enhanced colour recognition (optional)
  5.4 Oculars with enhanced reflectance in the infrared
      (optional)
  5.5 Additional requirements for welding filters with dual
      scale number
      5.5.1 Difference in scale number
      5.5.2 Transmittance
      5.5.3 Dimensions
Annex A (informative) - Guidance on selection and use
      A.1 - General
            A.1.1 - Scale numbers to be used for gas welding and
                    braze welding
            A.1.2 - Scale numbers to be used for oxygen cutting
            A.1.3 - Scale numbers to be used for plasma jet
                    cutting
            A.1.4 - Scale numbers to be used for electric arc
                    welding or air-arc gouging
            A.1.5 - Scale numbers of filters to be used by
                    welders' assistants
            A.1.6 - Filters with enhanced colour recognition
            A.1.7 - Filters with enhanced reflectance in the
                    infrared
      A.2 - Remarks
Annex B (normative) - Relative visual attenuation quotient
                      for signal light recognition
      B.1 - Definition of relative visual attenuation quotient
            for signal light recognition
      B.2 - Spectral functions for the calculation of luminous
            transmittance and relative visual attenuation
            quotients
Annex C (informative) - Uncertainty of measurement and results
                        interpretation
      C.1 - Test report and uncertainty of measurement
Annex ZA (informative) - Clauses of this European Standard
                         addressing essential requirements or
                         other provisions of EU Directives
Bibliography

This European standard specifies the scale numbers and transmittance requirements for filters intended to protect operators performing work involving welding, braze-welding, arc gouging and plasma jet cutting. The other applicable requirements for these types of filters are given in EN 166:1995. Guidance on the selection and use of these filters are given in Annex A. The specifications for welding filters with switchable luminous transmittance and welding filters with dual luminous transmittance are given in EN 379:1994.