Magnetic flowmeter with isolation amplifier and ranging circuit

Details Magnetic flowmeter with isolation amplifier and ranging circuit Magnetic flowmeter with isolation amplifier and ranging circuit

1987-07-13

1988-11-15

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

455608, G01F 160, H04B 900

Patent

active

047840013

ABSTRACT:
An isolation amplifier especially suited for magnetic flowmeters includes circuitry for converting an analog input signal to a duty cycle imposed upon a digital waveform, including generating clock pulses for synchronizing the digital waveform. Low-cost opto-couplers are provided for optically transmitting the digital waveform and information representative of the clock pulses across a barrier which would degrade the analog input signal and for receiving the optically transmitted digital waveform and clock pulse information and recreating the digital waveform with imposed duty cycle therefrom. Circuitry for digitally ranging the duty-cycle signal before the analog signal is reconstructed is also disclosed.

REFERENCES:
patent: 4309909 (1982-01-01), Grebe, Jr. et al.
patent: 4545257 (1985-10-01), Tomita et al.
patent: 4694504 (1987-09-01), Porter et al.
patent: 4713841 (1987-12-01), Porter et al.

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