A device for monitoring gas effusing from a pipe, the device comprising a mounting assembly having an upper and lower bracket; a housing located on the upper bracket; the bottom of the housing is of a shape complementary to the pipe being monitored; a probe assembly; a bore in the housing for receiving...http://www.google.fr/patents/US7552643?utm_source=gb-gplus-shareBrevet US7552643 - Device and system for corrosion detection
