Supply proof telephone devaluation Shanghai giant. ? The BZK-A Intrinsically Safe automatic telephone intrinsically safe explosion-proof electrical communications equipment. Its function and ordinary telephone, supporting the use with HOB-type coupler. Composed of explosion-proof communication systems can be networked with a variety of standard switches. Environment is different shell structure using aluminum alloy shell form to suit different needs. Hazardous area use. 1 and Zone 2 hazardous locations, A, II B class for explosive gas atmospheres, explosion-proof grade Exd Ⅱ BT4, widely used in chemical, petrochemical, fine chemicals, dyes, when the conditions of use with a variety of explosive mixed chemical industry, environmental protection, water treatment, pharmaceutical, food and other departments. Also apply to transport gasoline, kerosene, diesel oil, light fuel oil, the ideal tool for small and medium-sized oil fields, oil depots, oil refineries, gas stations, agricultural stations, enterprises and institutions, fleet vehicles, ships etc.