Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1992-05-29
1994-10-04
Chilcot, Jr., Richard E.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386116, G01F 160
Patent
active
053515544
ABSTRACT:
To provide highly accurate analog-to-digital conversion which is independent of coil-current fluctuations, this magnetoinductive flowmeter is equipped with a pipe made either of nonferromagnetic metal and insulated inside or of electrically non-conductive material, a coil system for producing a magnetic field whose direction is practically perpendicular to the axis of the pipe and which cuts the pipe, a control circuit for controlling a current flowing through the coil system and a measuring resistor, two electrodes which are mounted opposite each other in the wall of the pipe and whose connecting line is practically perpendicular to the pipe axis and to the direction of the magnetic field, and a measuring circuit having its input connected to the electrodes and containing, between its input and its output, the following subcircuits in the order given: a differential amplifier connected to the electrodes, a summer, an analog-to-digital converter which continuously incorporates a reference voltage in the conversion and to which the voltage across the measuring resistor is applied as said reference voltage, a microprocessor generating a compensation signal for the summer and including a sequencer, and a display unit.
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Biegel R.
Chilcot Jr. Richard E.
Endress & Hauser Flowtec AG
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