Thermal flow sensor and heat-sensitive resistor therefor

Details Thermal flow sensor and heat-sensitive resistor therefor Thermal flow sensor and heat-sensitive resistor therefor

1995-03-13

1995-11-14

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Thermal type

7320426, 731182, G01F 168

Patent

active

054656184

ABSTRACT:
A thermal flow sensor comprising a heat-sensitive electrical resistor having a substantially uniform temperature profile so that the heat radiation which causes a measurement error is decreased. The resistor element of the resistor comprises a main heat-sensitive section having a first resistance temperature coefficient and a thermal bullet section having a second resistance temperature coefficient greeter than the first temperature coefficient by at least 1,000 ppm, the thermal buffer section being positioned in the vicinity of the support means. The first temperature coefficient may be a negative value and the second temperature coefficient may be a positive value and the base member may be made of zirconia. Alternatively, the thermal flow sensor of the present invention may comprises the heat-sensitive resistor element which has a negative resistance temperature coefficient along its entire length.

REFERENCES:
patent: 3696294 (1972-10-01), Krupka
patent: 4559814 (1985-12-01), Sato et al.
patent: 4628743 (1986-12-01), Miller et al.
patent: 5033299 (1991-07-01), Tanaka et al.
patent: 5060511 (1991-10-01), Sakaue et al.
patent: 5094105 (1992-03-01), Emmert et al.
ATM Archive Fur technisches Messen, Sep. 1955, pp. 209-212.

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