Exothermic resistor element and thermal process air flow meter u

Details Exothermic resistor element and thermal process air flow meter u Exothermic resistor element and thermal process air flow meter u

1994-03-04

1996-05-28

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Thermal type

7317012, G01F 168

Patent

active

055200478

ABSTRACT:
In the thermal process air flow meter according to the invention first, second and third electrode terminals are arranged on the same surface at one end of a substrate. A first exothermic resistor is connected between the first and second terminals, and a second exothermic resistor is connected between the second and third terminals, with the first exothermic resistor on a front surface of a substrate and the second exothermic resistor on the opposite (back) surface. The substrate may also carry the semiconductor elements of an electronic circuit used to analyze electric signals from the terminals. In a preferred embodiment of the invention, the substrate is mounted at an incline relative to the direction of unobstructed air flow in the air passage.

REFERENCES:
patent: 3490283 (1970-01-01), Vidal et al.
patent: 3995481 (1976-12-01), Djorup
patent: 4320655 (1982-03-01), Kammermaier et al.
patent: 4691566 (1987-09-01), Aine
patent: 4829814 (1989-05-01), Suzuki et al.
patent: 4920793 (1990-05-01), Djorup
patent: 4936144 (1990-06-01), Djorup
patent: 5024083 (1991-06-01), Inada et al.
patent: 5086650 (1992-02-01), Harrington et al.
patent: 5140854 (1992-08-01), Sakaue et al.
patent: 5271272 (1993-12-01), Hueftle et al.
English translation of Office Action from foreign patent office in corresponding foreign application.

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