Device for measuring a breathing gas component in a breathing gas line

The present invention pertains to a device with a gas sensor for measuring a breathing gas component in a breathing gas line, which is connected via a breathing gas delivery device to a gas supply line for breathing gas and with a bypass line extending from the breathing gas line to the gas supply line. A device with a gas sensor for measuring a breathing gas component in a breathing gas line is improved such that a pressure correction of the gas concentration measurement can be performed without appreciably affecting the respiration pressure. Provisions are made for branching off a first measuring gas line () with a first electrochemical measuring cell () from the breathing gas line (). A first throttling point () is arranged in the course of the first measuring gas line () between the first electrochemical measuring cell () and the breathing gas line (). A first pressure sensor (), for the pressure correction, is located downstream of the first electrochemical measuring cell ().