DIN EN 60079-29-4:2011 Explosive atmospheres - Part 29-4: Gas detectors - Performance requirements of open path detectors for flammable gases (IEC 60079-29-4:2009, modified + Cor. :2010); German version EN 60079-29-4:2010
2011DIN EN 60079-29-4:2011 Explosive atmospheres - Part 29-4: Gas detectors - Performance requirements of open path detectors for flammable gases (IEC 60079-29-4:2009, modified + Cor. :2010); German version EN 60079-29-4:2010