intrinsic safety telephone, with explosion-proof and safety certificate,best quality ,suitable to coal mine underground Scope of applicationBFH-33 intrinsically safe telephone for the double audio frequency telephone, and associated equipment HDK coupler and dispatching station or switch can be composed of coal mine safety communication system network. This widely used in potentially explosive mixtures in the environment. The explosion-proof symbol "Exibl".Telephone set DC power source of 48 volts, by HDK mine telephone coupler supply phone via telephone coupler and electric, automatic telephone switching system supporting the use of form mine wired communication system. The telephone is divided into key and answer two.Technical characteristicsIn 1, the machine body for the aluminum alloy casting, beautiful appearance, high mechanical strength.2, using the new button dial.In 3, the machine circuit adopts the international universal integrated circuit, has made accurate, call, clear, stable.In 4, have two audio dialing compatibility functions (the factory general switch in the audio).In 5, the shockproof, moisture-proof, small volume, light weight, firmness, durability, convenient maintenance and so on.Main technical parameters1, the use of conditions;Environment temperature: -10 °C ~+40 °CHumidity: ≤ 95% (+25 °C)Atmospheric pressure (86~10+): kPaRelated equipment: KTH coupler2, security parameters:Supply voltage: 24~60VThe highest voltage ringing open road: ≤ 40VMaximum input voltage: 20mA3, electroacoustic index:Sending loudness rating: ≥ +2dB (0km simulation line) ≤ +18dB (10km simulation line)Receiving loudness rating: ≥ -8dB (0km simulation line) ≤ +2dB (10km simulation line)Side tone masking rating: ≥ +2dB (0km simulation line) ≤ +8dB (10km simulation line)Ringing sound level: 80 dBPulse intermittent ratio: 16 ± 0.2:1Pulse rate: 10 ± / sec
Intrinsically safe explosion-proof telephone
