Vortex flowmeter

Details Vortex flowmeter Vortex flowmeter

1989-01-31

1990-06-19

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 132

Patent

active

049341944

ABSTRACT:
A vortex flowmeter comprising a signal converting sensor for converting a flow rate to be measured into a vortex signal, a tracking filter section in a subsequent stage, and a noise discriminating circuit. The tracking filter section receives the output amplitude of the signal converting sensor, changes the corner frequency of a low pass filter, and delivers a filtered signal. The noise discriminating circuit receives a frequency signal obtained by frequency conversion of the filtered signal and the output amplitude of the signal converting sensor, performs a given calculation to achieve noise discrimination, and prevents output of the frequency signal when noise is found.

REFERENCES:
patent: 3638037 (1972-01-01), McMurtrie
patent: 4201084 (1980-05-01), Ito et al.
patent: 4437350 (1984-03-01), Tamura et al.

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