DIN EN 50402:2018 Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen - Requirements on the functional safety of gas detection systems; German version EN 50402:2017
2018DIN EN 50402:2018 Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen - Requirements on the functional safety of gas detection systems; German version EN 50402:2017
2015DIN EN 50402 E:2015 Draft Document - Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen - Requirements on the functional safety of fixed gas detection systems; German version prEN 50402:2015
2009DIN EN 50402:2009 Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen - Requirements on the functional safety of fixed gas detection systems; German version EN 50402:2005 + A1:2008