The Bacharach MGS-550 Dual Gas Detector is a high-performance detection unit designed for refrigerants, toxic gases, and combustible gases. It supports multiple sensor technologies — electrochemical, semiconductor (MOS), catalytic bead, and infrared — in one platform, ensuring outstanding detection capability. Compliant with ASHRAE 15 and EN 378 standards, the MGS-550 integrates easily with central control systems via analog outputs or Modbus RTU. With three configurable relays, it can also operate as a stand-alone device. The modular design allows for easy expansion from one to two sensors without complex reinstallation. Key features include IP66-rated enclosure, integrated audible/visual alarm, wide operating temperature range (-40 to +50°C), and compatibility with a wide range of gases such as R-134a, R-32, R-290, R-404A, ammonia (R-717), and CO₂ (R-744).