초록 ▼

A nonporous composite electrode, particularly suitable for use in electromagnetic flowmeters, includes a non-metallic, electrically conductive element consisting of a fused mass of polymeric material, such as perfluoroalkoxy (pfa) fluoropolymer, and carbon fibers. The electrode is fabricated by stac

A nonporous composite electrode, particularly suitable for use in electromagnetic flowmeters, includes a non-metallic, electrically conductive element consisting of a fused mass of polymeric material, such as perfluoroalkoxy (pfa) fluoropolymer, and carbon fibers. The electrode is fabricated by stacking alternating layers of polymeric film and carbon fiber paper, subjecting the assembly to sufficient heat and pressure to intermix the two components and bond them into a coherent mass, and fusing the resultant composite material onto a mounting pin. Using a polymeric material compatible with the polymeric liner of an electromagnetic flowtube allows the finished electrode to be fused into the liner, again by application of heat and pressure, so as to achieve a seamless interface. This configuration virtually eliminates process fluid leaks around the electrode, while the electrode structure itself exhibits exceptional high temperature stability and corrosion resistance.

대표청구항 ▼

A nonporous electrode assembly comprising: a composite electrode element, including: a plurality of carbon fibers arranged in a threedimensional array, the majority of said fibers being randomly aligned within a series of mutually parallel planes, yet being packed densely enough to produce multiple

A nonporous electrode assembly comprising: a composite electrode element, including: a plurality of carbon fibers arranged in a threedimensional array, the majority of said fibers being randomly aligned within a series of mutually parallel planes, yet being packed densely enough to produce multiple points of contact thereamong, said electrode element having an elongated face with a longitudinal dimension which is greater than a thickness dimension measured perpendicular to said elongated face, said parallel planes being parallel to said elongated face, whereby electrical continuity is established throughout said array, and the electrical conductivity characteristic of said electrode element is greater in a direction parallel said elongated face than that in a direction normal to said elongated face, and a matrix of polymeric material permeating the interfiber voids within said array so as to produce a coherent, nonporous structure; and contact means for electrically coupling said electrode element to an external electrical circuit.