Measuring and testing – Volume or rate of flow – By measuring thrust or drag forces
Patent
1989-11-01
1991-10-15
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring thrust or drag forces
7386175, G01F 128
Patent
active
050563734
ABSTRACT:
In the measurement of fluid flow, the generation of a linearly varying signal and a pulsation free display are provided by a flow responsive indicator having digit displays for numerically indicating the rate of measured flow. The digit displays are driven in accordance with a measured flow signal applied to circuitry for generating an updated display signal from a previous display signal and the current value of the measured flow signal. This analog updated display signal is converted into a digital signal for driving circuitry connected to each of the digit displays. The measured flow signal applied to the indicator is generated at a flow transmitter including a transducer, such as a Hall effect element. This transducer generates a signal varying with flow in response to movement of a vane mounted in proximity thereto. To provide a signal varying linearly with flow rate, a flexible element extends into the fluid stream and by action thereof displaces the vane with reference to the transducer to generate the desired linearly varying signal.
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Goldstein Herbert
Meier Harold E.
Span Instruments, Inc.
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