Thermal type flow measurement apparatus having asymmetrical...

Details Thermal type flow measurement apparatus having asymmetrical... Thermal type flow measurement apparatus having asymmetrical...

2007-10-30

2007-10-30

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

C073S204260

Reexamination Certificate

active

11210869

ABSTRACT:
IN a thermal type flow measurement apparatus, a heating element is disposed in a fluid passage and generates heat by a passage of a current through itself. A first thermal sensitive element is disposed adjacent upstream of the heating element in a direction of fluid flow to be measured. A second thermal sensitive element is disposed adjacent downstream of the heating element in the direction of fluid flow to be measured. The fluid passage is provided with the heating element, the first thermal sensitive element, and the second thermal sensitive element. The fluid passage has an asymmetric structure with respect to the direction of fluid flow.Means for measuring a difference of temperatures is sensed by the first and the second thermal sensitive elements to produce a voltage according to a fluid flow rate. Heat control means for controlling the passage of the current through the heating element so that a sum with weights of respective temperatures sensed by the first and the second thermal sensitive elements reaches a preset value.

REFERENCES:
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patent: 6745625 (2004-06-01), Ariyoshi
patent: 1 363 130 (2003-11-01), None
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patent: WO89/05963 (1989-06-01), None
European Search Report dated Nov. 3, 2006 (Nine (9) pages).

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