Electromagnetic fluid flow rate meter - has arcuate electrodes applying electromagnetic field which is sensed by coils according to fluid flow rate

摘要

A fluid flow rate meter for measuring the speed of a fluid (14) which partially fills a conduit (10) comprises an inner tube (11) which closely fit against the interior wall of conduit (10). The tube (11) carries a pair of arcuate electrodes (12 and 13). The electrodes each extend around the conduit axis to subtend an angle of nearly 180 deg.. An electromagnetic field (110) is propagated at right angles to the fluid surface through the electrodes (12 and 13). A pair of inductor coils (15 and 16) are disposed adjacent the exterior surface of the conduit. Signals generated in the coils (15 and 11) are independent of the level of fluid in the conduit and vary only in proportion to the speed of fluid flowing in the conduit.