... 4-20mA signal transmit 3:Competitive price 5:ISO9001&C JB-TB-AT2020SH gas alarm Controller can network at most 8 ... changeover of main power and backup power suppliesTechnical Model No.JB-TB-AT2020SHCapacity≤8Power consumption≤10W(not contain accessories)Signal transmitfour ... 93%RH( incondensable),Pressure:86kPa~106kPa Detector model AT0501AH,XP2000 JB-TB-AT2020SH gas alarm controller with 1-8 channel