A tubular membrane extractor column is connected to an oil filled electrical component such as a transformer. Fault gases dissolved in the transformer oil are extracted from the oil in the separator and are isolated in a second phase. Oil and second phase gas are circulated in separate flow paths until...http://www.google.com.au/patents/US6391096?utm_source=gb-gplus-sharePatent US6391096 - Apparatus and method for extracting and analyzing gas
