Heating resistor flow rate measuring instrument

Details Heating resistor flow rate measuring instrument Heating resistor flow rate measuring instrument

2006-05-30

2006-05-30

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

Proportional

C073S204220

Reexamination Certificate

active

07051589

ABSTRACT:
A heating resistor flow rate measuring instrument, having a heating resistor and a thermally sensitive resistor disposed in a sub-passage of a main passage. The heating resistor is disposed in a portion of the sub-passage which has an upstream-side opening substantially perpendicular to the forward direction of a fluid flow and a downstream-side opening substantially parallel to the reverse flaw direction, and the thermally sensitive resistor is disposed in a second sub-passage portion having an upstream-side opening substantially parallel to the forward flow direction and a downstream-side opening substantially perpendicular to the reverse flow direction. Based on changes in resistor temperatures when the flow direction reverses, a precise flow rate may be determined even when a pulsation occurs in the fluid, as both a plus effect caused by a backward flow is eliminated and a value corresponding to the backward flow may be subtracted to obtain accurate flow information.

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patent: 7-280613 (1995-10-01), None
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Copy of European Search Report dated Mar. 1, 2006.

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