GOST IEC 61779-4-2006 Electrical apparatus for the detection and measurement of flammable gases. Part 4. Performance requirements for group II apparatus indicating a volume fraction up to 100% lower explosive limit
2006GOST IEC 61779-4-2006 Electrical apparatus for the detection and measurement of flammable gases. Part 4. Performance requirements for group II apparatus indicating a volume fraction up to 100% lower explosive limit