Flangeless electromagnetic flowmeter

Claim 1

A flangeless electromagnetic flowmeter insertable between upstream and downstream pipes which have the same internal diameter, the adjacent ends of said pipes having like annular flanges, each provided with a like series of holes which lie in a circle, said flowmeter comprising: A a cylindrical flowmeter body interposed between the flanged ends of the pipes, said body being provided with an annular pressure vessel formed of insulating material to define a central flow passage having a diameter matching the internal diameter of the pipe whereby the flowmeter functions to meter the flow rate of fluid passing through said pipes and said passage along a longitudinal axis extending therethrough; B a pair of cylindrical electromagnetic coils embedded in said insulating material at diametrically-opposed positions with respect to said passage to establish a magnetic field therein whose lines of flux are substantially perpendicular to said longitudinal axis; C a pair of electrodes embedded in said insulating material at opposed positions with respect to said passage, said electrodes lying along a transverse axis at right angles both to said lines of flux and said longitudinal axis; said insulating material having bores extending longitudinally therethrough which lie on a circle concentric with said central flow passage and which avoid said coils and said electrodes; and D means bridging said flanged ends to clamp said flowmeter body therebetween, said means being formed by bolts passing through said flange holes and the bores in registration therewith.