Arrangement for detecting gaseous component in gas flow, e.g. alcohol in breath; has choke in sample extraction line, pressure sensor on upstream side of choke, flow detector for generating null flow signal

摘要

The arrangement has a flow choke (8) in a sample extraction line (3) and a pressure sensor (9) that detects the pressure on the upstream side of the choke. A heated wire anemometer flow detector (10) for generating a null flow signal is arranged in the sample extraction line.