gas safety device 1)Unit:ppm, mA, %,%LEL,%VOL 2)Display:backlight LCD ... Control System) * Flameproof body design acc. to IEC61508,simple and easy installation and maintenance. * Multi-parameter backlight LCD display: measuring range,digital ... graph , system status etc.* International standard plug-in sensor, Plug and Play! .* Sensor replacement without recalibration, automatic sensor data recognition. ...