Flow rate sensor, flow rate measuring device, and flow rate...

Details Flow rate sensor, flow rate measuring device, and flow rate... Flow rate sensor, flow rate measuring device, and flow rate...

2005-01-18

2005-01-18

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

Reexamination Certificate

active

06843123

ABSTRACT:
A flow rate sensor capable of increasing a range where fluid flow rate can be detected with a high accuracy. The flow rate sensor includes: a sensor pipe; a resistor group; a reference resistor group; a constant current source; a first differential circuit; and a flow rate decision unit. The flow rate sensor further includes: a dummy sensor pipe where no fluid is flown; a dummy resistor group changing their resistance value according to the temperature and attached in the longitudinal direction, a dummy reference resistor group, a for-dummy constant current source, switch means for selectively connecting the resistor group with the dummy resistor group in series, a flow rate range increasing differential circuit for detecting a potential difference, and a third flow rate decision unit for obtaining the flow rate of the fluid flowing in the fluid passage according to the potential difference.

REFERENCES:
patent: 4519246 (1985-05-01), Hartemink
patent: 4877051 (1989-10-01), Day
patent: 5410912 (1995-05-01), Suzuki
patent: 6085588 (2000-07-01), Khadkikar et al.
patent: 6125695 (2000-10-01), Alvesteffer et al.
patent: 6446504 (2002-09-01), Maginnis, Jr.
patent: 01-227016 (1989-09-01), None

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