Thermal type flow meter

Details Thermal type flow meter Thermal type flow meter

1997-09-22

1999-09-14

Patel, Harshad

Measuring and testing

Volume or rate of flow

Thermal type

731182, G01F 168

Patent

active

059525711

ABSTRACT:
In a thermal type flow meter having a temperature compensating bridge circuit, the temperature compensating bridge circuit includes a heating resistor, a temperature compensating resistor and a plurality of resistors each having a fixed resistance. The heating resistor and the temperature compensating resistor are supported by a support member in an air flow passage, and the support member is formed by a material having a small temperature coefficient .DELTA..lambda. of thermal conductivity between -0.06 and 0.06 w/m.multidot.k.sup.2. The absolute value of the output error of the flow meter is reduced as a result of variation of the flow quantity or flow velocity of intake air and the intake air temperature.

REFERENCES:
patent: 5224378 (1993-07-01), Yajima et al.
patent: 5392646 (1995-02-01), Yajima
patent: 5419187 (1995-05-01), Uchiyama
patent: 5623097 (1997-04-01), Horiguchi et al.

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