The source and composition of refinery gases varies considerably. Measuring gas composition precisely and accurately is a significant challenge in refinery operations. The Agilent Micro GC Refinery Gas Analyzer (RGA) is a 4 channel, multi-dimensional system based on the 490 Micro GC. Each channel includes a micro-machined injector, capillary column, and thermal conductivity detector optimized for specific RGA analytes, with total analysis cycle time of less than three minutes. The small system volume means the sample capacity is reduced in comparison to standard GC RGA systems and is more suitable for sample streams with low sample component concentration such as typical refinery gas streams and impurities in bulk ethylene.