Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1986-11-17
1988-02-09
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 160
Patent
active
047234490
ABSTRACT:
An electromagnetic flow meter of the type in which a magnetic field is applied across a fluid the flow of which is to be monitored, the field being applied in the form of pulses in forward and reverse directions, in which induced voltage pulses are taken from electrodes in contact with the fluid, and in which the induced voltage pulses are processed to provide a flow-representing output in the form of a frequency, the flowmeter comprising means to derive first and second signal levels from the amplitudes of the induced voltage pulses corresponding respectively to the forward and reverse directions of magnetic field, and integrator means arranged to receive the first and second signal levels alternately as an input, and to integrate in one direction in response to the first signal level until the output of the integrator means reaches a first reference level and to integrate in the opposite direction in response to the second signal level until the output of the integrator means reaches a second reference level, the frequency output being derived, in use, from the output of the integrator means.
REFERENCES:
patent: 3943765 (1976-03-01), Takada et al.
patent: 4206641 (1980-06-01), Takada
patent: 4339958 (1982-07-01), Shauger
Danfoss A/S
Easton Wayne B.
Ruehl Charles A.
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