Device for detecting a gas volume flow

A device for detecting a gas volume flow, the device comprising:

• a lumen for guiding the gas volume flow;
• a flow sensor surrounding said lumen, said flow sensor including an ultrasound transmitter and an ultrasound receiver, said ultrasound transmitter being arranged at a spaced location from said ultrasound receiver such that said ultrasound receiver can receive ultrasound waves transmitted by said ultrasound transmitter and the ultrasound waves pass through said lumen at least in some sections;
• a mount associated with said flow sensor, said mount including a transmitter mount for mounting said ultrasound transmitter, said transmitter mount for separably connecting to said ultrasound transmitter, and said mount including a receiver mount for mounting said ultrasound receiver, said receiver mount for separably connecting to said ultrasound receiver, said mount including a connection sensor for detecting at least one of a connection between said ultrasound transmitter and said transmitter mount and a connection between said ultrasound receiver and said receiver mount, said connection sensor changing at least one electrical property as a function of the connection, or generating a connection signal, which represents the connection, and providing an output of said at least one electrical property or said connection signal.