Measuring and testing – Volume or rate of flow – Using rotating member with particular electrical output or...
Patent
1987-11-02
1989-05-16
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Using rotating member with particular electrical output or...
G01F 110
Patent
active
048298336
ABSTRACT:
Flow monitors are disclosed for liquid like tap water having limited electrical conductivity, including a flow sensor and a circuit connected to electrodes in the flow sensor for producing flow-representing signals. Vanes of a flow-activated rotor made of insulation displace part of the pattern of current paths between the flow-sensor's electrodes. Circuits connected to the electrodes include a d-c or a-c excitation source and an impedance in series with the electrodes for providing amplitude-varying signal output. The steady-state excitation voltage at the electrodes is maintained constant despite diverse resistivities of various liquids, and the series impedance is much higher than the resistance between the electrodes. D-c excitation promotes economical utilization of a long-life circuit-energizing battery. With d-c excitation, the positive electrode is of platinum or other material that serves as an electro-chemically inert anode in the liquid.
REFERENCES:
patent: 3564915 (1971-02-01), Tomota et al.
patent: 4157660 (1979-06-01), Spacett
patent: 4333354 (1982-06-01), Feller
patent: 4399696 (1983-08-01), Feller
patent: 4535637 (1985-08-01), Feller
patent: 4561310 (1985-12-01), Banard et al.
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