Gas flow sensor having redundant flow sensing capability

Details Gas flow sensor having redundant flow sensing capability Gas flow sensor having redundant flow sensing capability

2005-09-20

2005-09-20

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

Using differential pressure

Reexamination Certificate

active

06945123

ABSTRACT:
A sensor for redundantly measuring gas flow has a housing suitable for being interposed in a gas flow conduit. The housing has an orifice through which the gas to be measured flows. A gas flow measuring, hot wire anemometer is positioned in the housing proximate to the orifice for providing a first measurement of the gas flow in the conduit. A first absolute pressure sensor measures gas pressure downstream of the orifice. The first pressure sensor may provide pressure compensation to the anemometer. A second absolute pressure sensor measures gas pressure upstream of the orifice. The first pressure sensor may be further used with the second pressure sensor to obtain a differential pressure measurement providing a further measurement of the gas flow in the conduit that is redundant to that of the anemometer.

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