Flow rate meter with temperature dependent resistor

Details Flow rate meter with temperature dependent resistor Flow rate meter with temperature dependent resistor

1980-04-16

1981-12-08

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

73116, G01F 168

Patent

active

043041302

ABSTRACT:
A flow rate meter for measuring the flow rate of a fluid medium, especially that of the air aspirated by an internal combustion engine. A hot wire or film is placed in the air stream and is made part of an electrical circuit powered by the output of a differential amplifier. The voltage drop across the resistor is monitored at the input of the differential amplifier where it is compared with fixed or compensated values. In order to reduce the effect that airborne particles, which are deposited on the hot wire or film, have on the measuring characteristics of the apparatus, the wire or film are shaped so that their leading edge constitutes an area much smaller than the surfaces which are substantially parallel to the stream lines.

REFERENCES:
patent: 2870305 (1959-01-01), Ling
patent: 3498127 (1970-03-01), Richards
patent: 3995481 (1976-12-01), Djorup
patent: 3996799 (1976-12-01), Van Putten

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