BS EN 379:1994 Specification for Welding filters with switchable luminous transmittance and welding filters with dual luminous transmittance

Implementing Amendment № 1. The European Standard EN 379:1994, with the incorporation of its amendment A1:1998, has the status of a British Standard. 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. — 14 p. — ISBN: 0 580 21878 3.
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.