Engineered for applications in refineries, petrochemical plants and compressor plants, this device couples the firm’s SEC 3000 sensor with its SEC 3100 transmitter to detect trace concentrations of explosive gas. The sensor works in tandem with the transmitter, which incorporates a plug-in memory stick that logs a permanent record of actual gas levels, remembering times, concentrations, trouble signals, service interruptions, etc. The memory stick is easily removed from the transmitter to download data for retrieval and computer analysis.