There is provided an analysis device comprising a gas phase and a liquid phase and at least one sensor, said sensor having at least one point where an analyte is detected, said at least point being in contact with the liquid phase, characterized in that the device comprises a membrane with a first and a second side, which membrane is in contact with the gas phase on at least a part of one side of the membrane and which membrane is in contact with the liquid phase on at least a part of the other side of the membrane, wherein the membrane comprises openings, and wherein the largest possible distance between any two openings in the membrane is larger than the distance between the membrane and the point where an analyte is detected, moreover there is provided a method for analyzing an analyte in a gas phase.