An external pump for the portable gas detectors Draeger X-am® 2500, 5000, and 5600 – designed for clearance measurement, for example in tanks and shafts. The X-am pump can reach the ambient atmosphere in inaccessible places – up to a distance of 45 m, e.g. in channels, shafts, or tank systems. The pump has an explosion protection approval for Ex zone 0. The battery capacity lasts for three workweeks at 8 measurements per day (i.e. up to 20 hours of continuous operation).