Electromagnetic flowmeter

Details Electromagnetic flowmeter Electromagnetic flowmeter

1995-08-14

1997-04-15

Chilcot, Richard

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

7386112, G01F 100

Patent

active

056211775

ABSTRACT:
An electromagnetic flowmeter for converting flow rate of a fluid to be measured into an electrical signal and for outputting a flow rate signal corresponding to the flow rate using detecting electrodes, comprising exciting means for applying a magnetic field to the fluid with an excitation period thereof being shorter than the non-exciting period; AC coupling means for obtaining an AC signal through AC coupling of signals outputted from the electrodes sample and hold means for sampling and holding the AC signals with a sampling signal having a sampling width including portions before and after the excitation period, and for outputting the resulting sample and hold signal as a hold signal; switching means for changing a reference potential before and after the sample and hold; and signal processing means for processing the hold signal to produce the flow rate signal.

REFERENCES:
patent: 4704907 (1987-11-01), Mannherz et al.
patent: 4766770 (1988-08-01), Mannherz et al.

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