... 20mA, 3 wire connection ,compatible with existing alarm control unit or DCS (Distributed Control System) 2) Flameproof body design acc. to ... : measuring range,digital gas reading ,units, bar graph , system status etc.4) International standard plug-in sensor, Plug and ... output monitoring and indicating.6) Programmable alarm operation value, low or high level alarm indication.7) Three-key operation for ...