Direct-heated gas-flow measuring apparatus

Details Direct-heated gas-flow measuring apparatus Direct-heated gas-flow measuring apparatus

1986-11-12

1988-11-22

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

731182, 7320426, G01F 168

Patent

active

047856629

ABSTRACT:
A direct-heated gas-flow measuring apparatus including a measuring tube disposed in the gas stream, a film resistor for generating heat and detecting the temperature thereof, and a feedback control circuit for controlling the heat generated by the film resistor so that the temperature of the film resistor is a predetermined value. Provided at least at the upstream side of the film resistor near thereto is a shield for reducing the accumulation of deposits on the film resistor. The shield and the film resistor have substantially the same thickness to satisfy the condition:

REFERENCES:
patent: 4261199 (1981-04-01), Sauer et al.
patent: 4412449 (1983-11-01), Elermann et al.
patent: 4478077 (1984-10-01), Bohrer et al.
patent: 4498337 (1985-02-01), Gruner
patent: 4527427 (1985-07-01), Grunwald
patent: 4538456 (1985-09-01), Gneiss et al.
patent: 4587842 (1986-05-01), Handtmann

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