Measuring and testing – Volume or rate of flow – System
Patent
1978-06-02
1979-09-18
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
G01F 158
Patent
active
041678710
ABSTRACT:
An electromagnetic flowmeter capable of accurately measuring the flow rate of fluid conveyed on a line in either direction. The flowmeter includes a primary whose flow tube is provided with electrodes yielding a signal depending on the flow rate of the fluid intersecting a magnetic field established in the tube, the sense of the signal changing with the direction of flow. This electrode signal is applied to a secondary in which the electrode signal is converted by demodulator means into a d-c signal whose magnitude is a function of flow rate and whose polarity depends on the sense of the electrode signal. This d-c signal is converted into variable-frequency pulses which exhibit a duty cycle proportional thereto, the pulses being sampled and fed back through a feedback loop to one input of a summing junction to which the electrode signal is also applied as another input, the ouptut of the junction being fed to the demodulator means. Associated with the feedback loop is a bi-directional auxiliary which detects the polarity of the d-c signal and acts to apply the sampled duty cycle pulses to the summing junction in the same phase, regardless of the polarity of the d-c signal, whereby the output signals derived from the d-c-to-duty-cycle circuit is indicative of flow rate in either direction of flow.
REFERENCES:
patent: 3783687 (1974-01-01), Mannherz et al.
patent: 4089219 (1978-05-01), Suzuki
Schmoock Roy
Shauger Herbert
Ebert Michael
Fischer & Porter Co.
Ruehl Charles A.
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