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A standard aspirating anemometer probe has been laboratory tested for use in sensing relative concentration levels of binary gas mixtures. Analytical predictions of sensor response show general trends correctly for argon-helium mixtures, but for mixtures on xenon-helium (i.e., where component gases have very widely separated molecular weights) the predicted response for low concentrations of xenon is significantly in error. Experimentally determined calibrations are smoothly varying and have good stability and repeatability. Corrections to sensor response for variations in gas flow temperature can be made by simultaneously monitoring the flow temperature. Installing an anemometer driven temperature sensor directly in the aspirating probe and using direct electronic feed back from the temperature results enables the modified sensor to be used for monitoring turbulent concentration fluctuations in non-uniform temperature fields. (Puschmann)