Patent ID: 7044000

Claim:
A flow sensor for measuring a volumetric flow rate of a fluid flowing in a pipe, the sensor comprising: at least one probe having a respective axis and insertable into the pipe to a respective insertion depth, each at least one probe respectively comprising at least one pair of acoustic transducers spaced apart by a respective flow measurement distance along a respective flow measurement direction transverse to the respective probe axis and arranged to transmit and receive respective oppositely directed acoustic signals transverse to the respective flow measurement direction; at least one signal processing circuit for energizing at least one pair of transducers associated therewith, for receiving respective transit-time signals from those transducers and for generating therefrom at least one raw flow signal output responsive to a component of the fluid flow along the respective flow measurement direction; and a flow measurement circuit operable to receive a size signal value representative of an inside diameter of the pipe and the at least one electrical flow signal output and to calculate therefrom the volumetric flow rate.