Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1996-10-17
1997-07-08
Dougherty, Elizabeth L.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386112, G01F 160
Patent
active
056463537
ABSTRACT:
To measure the average velocity v.sub.m and the flow index N of an electrically conductive non-Newtonian fluid flowing through a measuring tube (11) whose portion coming into contact with the fluid is electrically nonconductive, this electromagnetic flowmeter further comprises: two coils (12, 13) positioned diametrically opposite to each other on the measuring tube which serve to produce a magnetic field when a coil current (i) flows therethrough; electrodes (14, 15) serving to pick off an induced first potential and an induced second potential, with a respective radius (14.sub.1, 15.sub.1) of the measuring tube at the point of each of the electrodes making an angle (.phi.) of less than 90.degree. with the direction of the magnetic field; a coil-current generator (21); a double-pole switch (22) for connecting the two coils either in series aiding or in series opposition; and evaluation electronics (24) which form a velocity signal (S.sub.v) proportional to the average velocity v.sub.m from a potential difference (u.sub.k) picked off with the coils connected in series aiding, or a flow index signal (S.sub.N) proportional to the flow index N from a potential difference (u.sub.g) picked off with the coils connected in series position and from the first-mentioned potential difference (u.sub.k). If a pressure difference (D) is additionally derived from the measuring tube, it is also possible to measure the consistency K and/or the apparent viscosity .epsilon..sub.s of the fluid.
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Mesch Franz
Trachtler Ansgar
Dougherty Elizabeth L.
Endress & Hauser Flowtec AG
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