Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1998-05-12
2000-08-01
Patel, Harshad
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386113, 7386112, G01F 158
Patent
active
060949929
ABSTRACT:
This electromagnetic flow measuring method and the corresponding flowmeter serve to improve the measuring accuracy in the range of measuring errors below 1% in conjunction with acceptable costs. The meter includes a tube (1), in which the fluid to be measured flows during operation. A single pair (2) of magnetic field coils is arranged on the lateral surface of the tube (1) on a magnetic field diameter (3) for generating a magnetic field. A first electrode pair including a first and a second electrode (41, 42), a second electrode pair including a third and a fourth electrode (43, 44), and a third electrode pair including a fifth and a sixth electrode (45, 46) touch the fluid. The first pair is arranged on diameter (4.sub.1) and forms an angle of 90.degree. with the diameter (3); the second pair is arranged on diameter (4.sub.2) and forms an angle of approx. 45.degree. with diameter (4.sub.1); the third pair is arranged on diameter (4.sub.3) and forms an angle of approx. 90.degree. with diameter (4.sub.2). A measuring circuit processes electrode pair voltages (u.sub.1, u.sub.2, u.sub.3). Only a portion of voltage (u.sub.2), which lies between 0.1 and 0.7 and is processed together with voltage (u.sub.1), and only the same portion lying between 0.1 and 0.7 of voltage (u.sub.3) is processed together with the voltage (u.sub.1).
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Horner Boris
Mesch Franz
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