Explosion-proof head lamps SGV-2 and SGV-2.1 are intended for individual illumination of the workplace and darkened sections of the route when going to the place of work in explosive zones, as well as in rooms with an environment gassed with amyl and heptyl vapors of mass concentration 0.05g / m3, categories IIA, IIB groups T1, T2, T3, T4, T5 according to the classification of GOST R 51330.11. Ambient temperature: during charging - from 15oС to 25oС; at discharge - from minus 18 ± 2oС to 33 ± 2oСГВ 2 relative air humidity up to 98 ± 2% at a temperature of 35 ± 2oС with moisture condensation and atmospheric pressure 600 ÷ 900 mm Hg. Scope of application in rooms in which flammable gases or vapors of flammable liquids are emitted, forming explosive mixtures with air during normal operation or as a result of accidents and malfunctions (zones of class B-1, B-1a, according to chapter 7.3 of the PUE); on ships of the sea and river fleet in hazardous areas of premises and outdoor installations. SGV-2.1 has a low illumination mode.