Heat type air flow meter

Details Heat type air flow meter Heat type air flow meter

1995-06-07

1997-08-05

Dombroske, George M.

Measuring and testing

Volume or rate of flow

Thermal type

731182, 732025, G01F 168

Patent

active

056545061

ABSTRACT:
A heat type air flow meter with improved resistance to radio wave interference by restraining a high frequency noise from a resistor and the supporting materials thereof provided in air passage. At least one high frequency band cut-off filter having a capacitor and a inductor is provided between, on one hand, a heating resistor and a heat sensitive resistor and, on the other hand, a temperature control circuit, and an intermediate connecting point of one end of the capacitor connected with one end of the inductor is also connected to both resistors. Thereby, as the resistivity to the radio wave interference is effectively improved cost reduction and compactness of the flow meter can be achieved.

REFERENCES:
patent: 4515014 (1985-05-01), Sumal
patent: 4523462 (1985-06-01), Kolodjski
patent: 4548075 (1985-10-01), Mariano
patent: 5074147 (1991-12-01), Sarma
patent: 5263369 (1993-11-01), Cutler
patent: 5417110 (1995-05-01), Wood
patent: 5460040 (1995-10-01), Tada et al.
patent: 5493906 (1996-02-01), Sen-Zhi
patent: 5509306 (1996-04-01), Yamamoto et al.
McGraw-Hill Encyclopedia of Science and Technology, pp. 287-290B (1977).

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