gas safety device 1)Unit:ppm, mA, %,%LEL,%VOL 2)Display:backlight LCD, ... ,compatible with existing alarm control unit or DCS (Distributed Control System) * Flameproof body design acc. to IEC61508,simple and easy installation ... LCD display: measuring range,digital gas reading ,units, bar graph , system status etc.* International standard plug-in sensor, Plug and Play ...