Thermal flowmeter having improved durability against thermal str

Details Thermal flowmeter having improved durability against thermal str Thermal flowmeter having improved durability against thermal str

1994-01-25

1995-06-13

Chilcot, Jr., Richard E.

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

054232139

ABSTRACT:
A thermal flowmeter for determining a parameter of a fluid flowing through a passage, includes: (a) resistor element including: an electrically insulating substrate; a metallic resistor supported by the substrate and having an electrical resistance which varies with an ambient temperature; and a pair of electrical conductors provided at opposite ends of the substrate and (b) electrically connected to the metallic resistor; and a pair of electrically conductive supports, fixed to a wall defining the passage, for securing the pair of electrical conductors, respectively, at securing portions in the pair of supports so that the resistor element is arranged in the passage; wherein a first distance between the pair of supports at the wall is smaller than a second distance between the pair of supports at the securing portions. The thermal flowmeter is durable under thermal stresses, especially when an ambient temperature around the thermal flowmeter frequently varies.

REFERENCES:
patent: 3333470 (1967-08-01), Fingerson
patent: 4297881 (1981-11-01), Sasayama et al.
patent: 4513615 (1985-04-01), Sato et al.
patent: 4549433 (1985-10-01), Greiss et al.
patent: 5144279 (1992-09-01), Yajima et al.
patent: 5224378 (1993-07-01), Yajima et al.

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