Arrangement for detecting a gaseous component in a gas flow

Claim 1

An arrangement for detecting a gaseous component in a gas flow, the arrangement comprising: a measuring chamber wherein the gaseous component of said gas flow is measured; a sample intake line for conducting said gas flow into said measuring chamber; a flow throttle mounted in said intake line; a pressure sensor for detecting the pressure in said sample intake line upstream of said flow throttle and for generating a pressure measurement signal indicative of said pressure in said sample intake line; a flow detector mounted along said sample intake line for generating a zero signal when there is a nonflow in said sample intake pipe and a nonzero signal when there is a gas flow in said sample intake line; a first evaluation path for forming a first measurement signal proportional to the ambient pressure in response to said pressure measurement signal supplied by said pressure sensor; and, changeover switching means operatively connected to said flow detector for connecting said pressure sensor to said first evaluation path in response to said zero signal whereby said first measurement signal is formed by said first evaluation path.