Thermal type flow measuring apparatus

Details Thermal type flow measuring apparatus Thermal type flow measuring apparatus

2006-07-06

2008-08-12

Thompson, Jewel V (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

Reexamination Certificate

active

07409859

ABSTRACT:
A thermal type flow measuring apparatus includes a heating resistor provided in a thin part of a substrate and a bridge circuit for driving the heating resistor to have a preset heating temperature, wherein resistor elements on sides forming the bridge circuit are temperature sensitive resistors, a part or whole of at least one of the temperature sensitive resistors is placed in the thin part and near the heating resistor so that the temperature sensitive resistor is influenced by a heat of the heating resistor, and the preset heating temperature is increased as the flow of fluid is increased. This configuration introduces flow dependency into the heating temperature of the heating resistor.

REFERENCES:
patent: 5708205 (1998-01-01), Yamada et al.
patent: 6-63801 (1994-08-01), None

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