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 Technical Specifications: 1.Measuring Parameters: LEL or flammable concentration of ammonia gas 2.Sensor Technology: Catalytic bead based pellistor sensor cell 3.Measuring range: 0 ~ 100 % LEL ( 0 ~ 15% v/v @ STP) 4.Response time (t90): < 30 sec 5.Control unit: 10 bit microprocessor based 6.Warm up time: < 5 mins 7.Auto zero point tracking for drift compensation 8.Power supply: 24 VDC 9.Ingress protection: IP65 10.Enclosure: Stainless steel (for sensor cell), anti-static epoxy coated metal alloy (for transmitter) 11.Output: linear, proportional 4-20mA 12.Mounting: wall, duct, pipeline 13.Safety integrity level: SIL 2 14.ATEX marking: 11.CE 722 Ex II 2G EEx d IIC T6 12.CE 722 Ex II 3G EEx nA IIC T6 13.Optional: LCD Display, alarm LEDs, potential free relay contacts 14.Hazardous area: Zone 1, 2