Thermal air flow rate measuring apparatus and its flowmeter...

Measuring and testing – Volume or rate of flow – Thermal type

Reexamination Certificate

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C073S204260

Reexamination Certificate

active

10484575

ABSTRACT:
A thermal air flow rate measuring apparatus of great precision wherein sensitivity is enhanced by sensors having different output characteristics and an operating device employing a digitized signal. The sensitivity and temperature can be corrected easily depending on the flow direction of fluid. The measuring apparatus includes at least one heating resistor disposed in a gas fluid, temperature detecting resistors formed at an upstream part and a downstream part of the heating resistor in the flow direction of the fluid, a device for outputting at least two signals relating to the flow rate of the fluid, a quantizing device for quantizing the output values, and an operating device for operating the flow rate based on the quantized signals.

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Supplementary European Search Report dated Aug. 3, 2006 (Three (3) pages).

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