Magnetic flow meter with buffering electrodes

Details Magnetic flow meter with buffering electrodes Magnetic flow meter with buffering electrodes

2008-11-28

2009-08-11

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

C073S861150

Reexamination Certificate

active

07571655

ABSTRACT:
The flow responsive voltages detected at the electrodes of magnetic flow meters are typically reduced in magnitude by an electrical impedance shunting effect of the fluid on the electrodes. This problem is resolved by providing buffering electrodes located near, and preferably both upstream and downstream, of flow responsive sensing electrodes. The buffering electrodes are driven by amplifiers having signals detected by the flow responsive electrodes as an input. Thus, fluid in the vicinity of the flow responsive electrodes is forced to acquire an offset voltage which can reduce the shunting effect to a negligible level.

REFERENCES:
patent: 4408497 (1983-10-01), Suzuki
patent: 5935077 (1999-08-01), Ogle
patent: 6571642 (2003-06-01), Feller
patent: 02099829 (1990-04-01), None

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