MRLDS-550 Industrial Refrigerant Gas Detector. (Modular Refrigerant Leak Detection System) continuously monitors indoor or outdoor ambient air for refrigerants, oxygen and toxic and combustible gases. The leak detector is housed in a rugged ABS enclosure. The MRLDS-550 can easily be integrated into any building management system (BMS) or supervisory controls. The Modbus RTU interface allows the user to program and confgure the unit remotely through the supervisory controls. Remote access gives complete control to the user when using Modbus via RS485.