Hand held device for the detection of trace gases

摘要

A portable, hand-held instrument for the detection of trace gases uses a battery powered circuit board capable of operating and measuring an array of plural metal oxide semiconductor (MOS) gas sensors of varied sensing material deposition geometry. The instrument includes one unmodified MOS gas sensor (A) and plural MOS sensors (B-E) modified with a crystalline porous solid such as a zeolite or metal oxide material in a varied deposition geometry across the sensor array to provide selectivity to a range of different gases.