Patent ID: 7823461

Claim:
A magneto-inductive flow sensor for a fluid flowing in a pipeline, comprising: a measuring tube for conveying the fluid; a magnetic circuit arrangement arranged at said measuring tube for producing and guiding a magnetic field, which induces an electric field in the flowing fluid; and measuring electrodes for tapping a voltage from the electric field, wherein: said measuring tube includes a carrier tube and a liner, especially a tubular liner, of insulating material accommodated in a lumen of said carrier tube; at least one groove formed in a wall of said carrier tube, which is open toward the lumen of said carrier tube, said measuring tube includes, an open-pored support skeleton embedded in said liner for stabilizing said liner; said at least one groove, is at least partially so filled by a material, especially a sintered material, of said support skeleton, directly sintered in said carrier tube, that said support skeleton is connected by shape interlocking with said carrier tube; the strength loss temperature of said carrier tube is greater than the strength loss temperature of said support skeleton a ridge is formed on said support skeleton corresponding to said at least one groove, and said ridge is comprised, at least in part, of the material of said support skeleton and extends into said at least one groove; and said at least one groove is embodied as an annular groove extending essentially coaxially with the wall of said carrier tube, said at least one groove located between the first end of the measuring tube and the second end of the measuring tube and spaced apart from a first widening and spaced apart from a second widening.