Meter for measuring air flow by resistance heating

Details Meter for measuring air flow by resistance heating Meter for measuring air flow by resistance heating

1994-06-22

1996-10-29

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Thermal type

7320426, G01F 168

Patent

active

055698514

ABSTRACT:
The characteristic of the present invention is that in a heating resistor portion and a lead member for electrically connecting the resistor portion to an external device, the lead member is composed of a first lead member for supplying a current to the resistor portion and second lead member for measuring a voltage in the resistor. According to an error in heat control due to resistances of a support, welding portion, wire bonding portion, etc. between a terminal of a sensing element and a driving circuit can be eliminated to thereby detect an air flow rate with a high accuracy.

REFERENCES:
patent: Re33076 (1989-10-01), Sugiura
patent: 3975951 (1976-08-01), Kohama et al.
patent: 4059982 (1977-11-01), Bowman
patent: 4335605 (1982-06-01), Boyd
patent: 4683858 (1987-08-01), Sato et al.
patent: 4920793 (1990-05-01), Djorup
patent: 5117691 (1992-06-01), Fraser
patent: 5237867 (1993-08-01), Cook, Jr.
Flow measuring apparatus by Okada Pub. No. JA 0158562.

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