Measuring and testing – Volume or rate of flow – System
Patent
1974-07-29
1976-06-29
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
G01F 158
Patent
active
039657388
ABSTRACT:
A magnetic flowmeter wherein liquid to be metered is conducted through a flow tube to intersect a transverse magnetic field produced by an electromagnet, the voltage induced in the fluid being transferred to a pair of electrodes mounted at diametrically opposed positions on the tube. The electromagnet is excited by DC power which is applied thereto periodically, this being effected by means of a switch interposed between the electromagnet and the DC power source. When DC excitation is cut off by the switch, the output voltage of the flowmeter is fed to a first hold circuit, whereas during the excitation period, both the flow signal and zero voltage are fed to a second hold circuit. The outputs from both hold circuits are fed to an amplifier whereby the held zero signal is subtracted from the total voltage of flow signal and zero voltage in order to eliminate zero error due to polarization.
REFERENCES:
patent: 3316762 (1967-05-01), Westersten
patent: 3550446 (1970-12-01), Tucker et al.
patent: 3759097 (1973-09-01), Cushing
patent: 3783687 (1974-01-01), Mannherz et al.
Hokushin Electric Works, Ltd.
Ruehl Charles A.
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