Heat wire airflow meter

Details Heat wire airflow meter Heat wire airflow meter

1989-06-23

1990-03-20

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

338 25, 338258, 338263, 338269, G01F 168, H01C 132

Patent

active

049090798

ABSTRACT:
A heat wire type airflow meter having a resistance element disposed within an airflow, the rate of which is measured, and a detection circuit for producing an airflow rate signal by detecting resistance change of the element depending on the airflow rate, in which the resistance element comprises a heat wire coil, lead wires attached to the heat wire coil at both ends thereof, a ceramic layer covering the heat wire coil and junctions of the heat wire coil and the lead wires to form a cylindrical member in such a manner that the heat wire coil is contained therein coaxially and along an inner surface thereof and a glass layer for coating an outer surface of the cylindrical member.

REFERENCES:
patent: 3205467 (1965-09-01), Ganci
patent: 3643200 (1972-02-01), Brandi
patent: 3803708 (1974-04-01), Wada et al.
patent: 4790182 (1988-12-01), Takahashi et al.

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