Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1987-02-27
1988-09-27
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 160
Patent
active
047732741
ABSTRACT:
An electromagnetic flow meter for measuring the flow rate of a fluid by applying to the fluid a magnetic field generated with an exciting current and measuring the resulting signal voltage generated at a pair of electrodes; wherein the exciting current comprises two frequency components which are lower and higher than the usual commercial frequency and the signal voltage comprises two frequencies which are discriminated so that a higher frequency is extracted as a first output and a lower frequency is extracted as a second output, through a low pass filter having a large time constant. A predetermined operation, such as addition, zero correction, response correction, etc, is carried out on the first and second outputs to produce a flow rate output. The invention has quick response, stable zero point and reduced susceptibility to noises.
REFERENCES:
patent: 4658653 (1987-04-01), Tomita
Azegami Tadashi
Goto Shigeru
Kobayashi Tamotsu
Kuromori Kenichi
Matsunaga Yoshinori
Kojima Moonray
Ruehl Charles A.
Yokogawa Electric Corporation
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