Opgal’s cooled OGI technology can detect a small leak of methane (0.35 g/hr) from distances of 2-3 meters with temperature difference of 2°C between the gas plume and the background. The TVA plume mapping test showed that the typical concentration edges of such visible plume (within 10 cm from the nozzle) are well below 1000 ppm. This exercise provided for the first time reasonable idea for the sensitivity of the cooled OGI technology in terms of volumetric concentrations (for methane, 2 m observation distance).