Product function ●For the dangerous sites with explosive air mixture:1division、2division. ●For explosive air mixture:IIA、IIB、IIC ●Temperature classification:T1-T6 ●Indoor、outdoor The explosion-proof type of the telephone is increase safety.The telephone has the function of normal telephone and has the function of electronics and no contact of inducting.The circuit use special technology.The telephone is used with the explosion-proof coupling of PANS-BOH-1 and connect to program controlled switch to form explosion-proof communication system Features: Metal keypad for extended life Circuit boards encapsulated in epoxy resin to be impervious to water and condensation A magnetic reed hook-switch to reduce the number of moving parts subject to wear Electret noise-reducing microphone Surge arrestor A service temperature range from -40C to +60C (-40F to + 140F) Waterproof connections with rust roof, stainless steel fittings and faceplate Mounting plate Armored handset assembly Applications: Petroleum refineries Bulk fuel loading facilities Marine, desert and arctic conditions Chemical plants Aerospace sites Off shore platforms Oil and gas tankers