... alarm One, alarm range:1, zone 1, zone 2 hazardous.In 2, IIA, IIB group explosive atmosphere.Three, explosion-proof, ... alarm, price, technical parameters:Executive standard: GB 3836.1-2000, GB 3836.2-2000, IEC60079Explosion proof mark: Exde II BT4, ExdeII CT4* ... In 3, steel tube or cable wiring.4, with GB3836-2000, IEC60079 standards. Installation and maintenance1, when installing the pressing ...