Patent ID: 6923040

Claim:
A device for measuring breath alcohol, the device comprising: a mouthpiece for picking up the exhaled respiratory gas volume flow of a person to be measured; a flow diaphragm provided in said mouthpiece; a pressure sensor connected via a first gas line to the mouthpiece upstream of the flow diaphragm; a breath alcohol sensor; an inlet channel connecting said breath alcohol sensor to said mouthpiece downstream of the flow diaphragm; a sampling system for sampling the respiratory gas sample from the respiratory gas volume flow; a second gas line connecting said breath alcohol sensor to said sampling system; an evaluation and control unit receiving measured signals of said pressure sensor and of said breath alcohol sensor and actuating said sampling system, said sampling system feeding two respiratory gas samples, in a time sequence, into said breath alcohol sensor, whereby a volume of a first respiratory gas sample is at most 40% of the volume of a second respiratory gas sample.