1:Tray type security alarm system 2:Monitoring toxic&combustible gas,temperature&pressure signal 3:4-20mA,Expandable channel security alarm systemFeature:1.Standard ... -time display detector 's information11.Equips with intelligentized power supply system, perfect under voltage, over-current protection function, Technical Model No ... model AT0502AH/L,XP2000/L,XP3000/L 4U tray type security alarm system