Thermal air flow meter

Details Thermal air flow meter Thermal air flow meter

1983-12-05

1985-04-30

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

045136157

ABSTRACT:
A thermal air flow meter consists essentially of a hollow cylindrical support made of an insulating material, a heat-sensitive resistor formed on top of the support, and lead wires inserted into the hollow part of the support from either end and bonded thereto by glass. This flow meter measures the flow rate from changes in the resistance of the heat-sensitive resistor with temperature. The ratio of the inner diameter d.sub.2 of the support to the outer diameter d.sub.3 of the lead wires (d.sub.2 /d.sub.3) is at least 1.7. This arrangement can provide a thermal air flow meter with a quick response to changes in flow rate.

REFERENCES:
patent: 4264961 (1981-04-01), Nishimura
patent: 4369656 (1983-01-01), Veno et al.
patent: 4393697 (1983-07-01), Sato et al.

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