Measuring and testing – Volume or rate of flow – System
Patent
1977-06-24
1978-10-10
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
G01F 158
Patent
active
041189817
ABSTRACT:
In a flowmeter, a permanent magnet is employed to apply a DC magnetic field to the liquid flowing through a pipe section. The magnet is mounted in a U-shaped housing adapted to fit over a nonmagnetic, nonconductive pipe section. Electrically conducting probes extend through the pipe section to contact liquid flowing through the pipe section at points spaced along a line perpendicular to the direction of the field applied by the magnet and perpendicular to the flow. As the magnet is brought into position over the pipe section, the approach of the magnet to the pipe section is detected by the closing of a reed switch. In response to the reed switch closing, a signal voltage proportional to the voltage across the two probes in contact with the liquid flowing through the pipe is stored on a capacitor. Then, three-fourths of a second later, after there has been sufficient time for the magnet to have been moved into position to apply the full strength of the magnetic field to the flowing liquid, a second signal voltage proportional to the voltage across the two probes is stored on a second capacitor. The difference between the stored voltages is detected to provide an indication of the rate of flow through the pipe section.
REFERENCES:
patent: 3550446 (1970-12-01), Tucker et al.
patent: 3965738 (1976-06-01), Watanabe
patent: 4010644 (1977-03-01), Bonfig et al.
Arcadia Refining Company
Ruehl Charles A.
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