Patent ID: 7331213

Claim:
A device with at least one sensor for determining one or more constituents of a medium flowing in an installation duct, the device including a housing and a main channel connected to said housing, the main channel closed at an end remote from the housing and has a first channel and a second channel separated from the first channel by a first separating wall, the main channel having at least one first opening, which is away from the end and creates a first connection between the first channel and the installation duct, and at least one second opening, which is away from the end and creates a second connection between the second channel and the installation duct, so that the medium flows between the openings, through the channels and past the sensor, characterized by: a second separating wall separating the first channel into a first subchannel and a second subchannel, wherein each subchannel is in communication with an opening, and each subchannel opening creating a connection between the respective subchannel and the installation duct.