G - Physics – 01 – F
Patent
G - Physics
01
F
73/72
G01F 1/68 (2006.01) G01F 1/698 (2006.01)
Patent
CA 1238504
ABSTRACT OF THE DISCLOSURE A hot-wire flow rate measuring apparatus includes a first thermo-sensitive resistive element disposed in the flow path of fluid under measurement, resistor unit connected in series to the first sensing element, a second thermo-sensitive resistive element for temperature compensation disposed in the flow path of the fluid, a control circuit adapted to supply a current to the serial connection of the first sensing element and the resistor unit in response to the dif- ference between the voltage produced by the first sensing element and the voltage produced by the second sensing element, and an output circuit for producing a voltage representative of the fluid flow rate in response to the terminal voltage of the resistor. The apparatus is further provided with a current circuit which controls the output characteristics of the out- put circuit by supplying a compensation current proportionate to the terminal voltage of the resistor to a portion of the serial connection.
487564
Tsutsui Mitsukuni
Uchiyama Kaoru
Hitachi Ltd.
Kirby Eades Gale Baker
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