Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1985-09-30
1987-07-21
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 160
Patent
active
046809732
ABSTRACT:
In an electromagnetic flow meter converter comprising a deviation amplifier for amplifying the deviation between a feedback signal and an input signal from a flow rate detector, and a converter circuit for converting the amplified output of the deviation amplifier into a frequency signal, the improvement comprising a frequency divider for frequency dividing the frequency signal, a digital setting unit for setting the frequency dividing factor of the frequency divider, and a multiplier for multiplying the output of the frequency divider by a comparison voltage which is proportional to the current applied to the coil of the flow rate detector to provide the feedback signal, whereby the span is set digitally and whereby the compatibility between the converter and the flow rate detector is obtained by setting the product of the meter constant of the flow rate detector and a predetermined maximum flow velocity. A second embodiment uses an oscillator, frequency dividers and multipliers to adjust and expand the range of zero adjustment to a value lower than 0% and to prevent mutual interference between the zero adjustment and span adjustment.
REFERENCES:
patent: 4089219 (1978-05-01), Suzuiki
patent: 4309909 (1982-01-01), Grebe, Jr. et al.
patent: 4325261 (1982-09-01), Freund, Jr. et al.
Goto Shigeru
Kobayashi Tamotsu
Ohta Hironobu
Torimaru Takashi
Goldstein Herbert
Kojima Moonray
Yokogawa Hokushin Electric Corporation
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