Key Features: 1.Catalytic bead based Pellistor sensor cell with low flash energy 2. 10-bit microprocessor control unit 3.Non-intrusive one man calibration via hall effect switches 4.ATEX certified explosion proof / flameproof, suitable for Zone 1, 2 gas explosion installation 5.Linear, proportional analog industry standard current output 6.Continuous system self-diagnosis with watch dog 7.Flashback arrestor with sintered filter 8.Auto Zero point tracking to zero point compensation 9.SIL 2 HW TUV certified 10.RS485 serial interface with Modbus RTU communication (optional) 11. 1 or 3 relay output module (optional) 12.System and alarm LED indicators (optional) 13.Modbus RTU communication over RS485 serial interface