Current selection circuitry for magnetic flowmeter

Details Current selection circuitry for magnetic flowmeter Current selection circuitry for magnetic flowmeter

1995-07-17

1997-06-17

Chilcot, Richard

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

7386116, 363 17, G01F 158

Patent

active

056399707

ABSTRACT:
A magnetic flowmeter system provides a volumetric flow rate output and includes flowmeter electronics for coupling to a flowtube assembly. The flowtube assembly includes a coil which receives a magnetic field producing coil current from a supply circuit in the flowmeter electronics. The coil produces a magnetic field which generates an EMF in the field representative of flow. An EMF sensor senses the generated EMF and provides an output indicating flow. The supply circuitry is coupled to coil wires of the coil and is responsive to a control signal. A sensor senses the frequency response of the coil and generates a sensor output. A comparator compares the sensor output with a predetermined level and provides a comparator output based upon the comparison. Control circuitry provides the magnitude control signal to the current based upon the comparison.

REFERENCES:
patent: 4193298 (1980-03-01), Kayama et al.
patent: 4229703 (1980-10-01), Bustin
patent: 5372045 (1994-12-01), Schulz
Integrated Circuits Unitrode, "Low-Power BiCMOS Current-Mode PWM", pp. 5-319--5-322.

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