Flow sensor of the thermal type

Details Flow sensor of the thermal type Flow sensor of the thermal type

2007-05-18

2008-10-21

Thompson, Jewel V (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

Reexamination Certificate

active

07437928

ABSTRACT:
A flow sensor of the thermal type having a U-shaped sensor tube with two legs and a connecting limb with two adjoining electrical resistance elements, and with a housing. The sensor tube has an inlet side and an outlet side. The housing has a first and a second housing part of a thermally well-conducting material, each with an inner surface provided with cavities and with an outer surface. The housing parts are placed with their inner surfaces against each other, while the U-shaped sensor tube has a main surface that extends parallel to the inner surfaces. The housing parts surround the connecting limb and the legs of the U-shaped sensor tube such that the sensor tube is thermally clamped in between the housing parts in two locations: a first location situated between its inlet side and the upstream resistance element, and a second location situated between its outlet side and the downstream resistance element.

REFERENCES:
patent: 4517838 (1985-05-01), Wachi et al.
patent: 4815280 (1989-03-01), Tujimura et al.
patent: 5191793 (1993-03-01), Drexel et al.
patent: 5279154 (1994-01-01), Vavra et al.
patent: 5309762 (1994-05-01), Satoh et al.
patent: 0809 090 (1997-11-01), None
patent: 03/058180 (2003-07-01), None

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