Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1997-11-04
2000-01-18
Fuller, Benjamin R.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 158
Patent
active
060149027
ABSTRACT:
A magnetic flowmeter has a tube for supporting fluid flow including a circuit for indicating when the tube is empty to prevent an erroneous flow signal from being provided by the flowmeter, as well as a diagnostic circuit indicating when electrodes in the flowmeter are partially fouled. The circuits include an amplifier connected to two electrodes in the tube and a variable resistor. In a normally operating mode, the amplifier produces an oscillating signal when the tube is empty, and in a diagnostic mode, the amplifier produces an oscillating signal when the electrodes are partially fouled.
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Fischer & Porter Company, "Magnetic Flowmeters 50XM1000B, Microprocessor-Based Signal Converter" Publication 24296, Figures 3-18, Schematic Analog Board, Jan. 1990.
Fonteneau Norman
Lewis Peter B.
Fuller Benjamin R.
The Foxboro Company
Thompson Jewel V.
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