Взрывозащищенные газа телефон

1 Range Can be used in nuclear power plant ,petroleum,chemical plant , storage and transport industry etc flammable and combustible area .Then user can be communicate in a dangerous area. 2 Feature 2.1 Shell of the explosion-proof telephone made of si-aluminium alloy with high temperature ,electrostatic plastic sprayed surface. Good impact resistance. 2.2 The telephone adopt stainless steel keypad, which contact resistance≤30ohm,life cycle≥2 million,push force 160-200grams,defend grade is up to IP67, good hand feeling. 2.3 Handle adopts imported Pc engineer material, thermostability of the PTFE wire .military noise cancelling microphone.Clear conversation in 115 dB enviroment . 2.4 Hook adopts magnetic induction switch, life cycle ≥500 thousand Increased safety terminal compartment, to ensure that product’s explosion-proof and electrical properties 2.5 Using integral design faith,integrate basic conversation ciruit ,noise removal circuit.power amplifying ciruit and power cicuitand protection circuit etc. These electronic components of the product adopt famous imported brand and selected by high and low temperature aging test 2.6 Six channels in a telephone or more are available which according to customer's requirement. This telephone network is flexible ,can be setted of its extension set arbitrarily , numbers can be changed random . All of telephones connect in a bus cables, so it can add or decrease anytime without restriction . Each telephone is the independent workstation, will break down not to interfere with the overall system work. The system has the automatic gain control,They donot change for volume of the Sound,lengh of distance and the quantity of telephone in whole system. 2.7 It is very easy to be installed and be protected for there is a extra box for more cables . 3.Technical parameter Ambient temperature -30 +50°CDefend grade IP66Relative humidity ≤95%Atmospheric pressure 80 106KPacall effective distance 6KmAnti-explosion grade Exde[ib]ibIIBT6,Exde[ib]ib II CT6,DIP A21 TA,T6 output voltage AC220V±15%,50HzWait,working current 50mA,≤0.2AFrequency response 250 7500 HzLines output audio signal level +2dBloop cicuit impedance 1KΩAmplify output power 0 25WContinuously adjustablenoise cancelling index 115dB enviromentinstallationwall-mounted