Sierra Monitor Corporation

Gulu N Advani

Robert W Beard

Leonard Nanis

Scott A Amundson

Eli M Goldfarb

A gauge measuring percent oxygen by simultaneously measuring oxygen partial pressure and ambient atmospheric pressure with solid state transducers. Two electrical signals obtained from the transducers are combined in a summing amplifier in accord with an empirically determined relation to yield a percent oxygen value which is displayed. The gauge has provisions for using an internal oxygen partial pressure transducer or an external probe connected to the gauge by a cable.

Percent oxygen gauge

A gas measurement method for metal-oxide gas sensors. The sensors are thermally cycled by sequential heating and cooling. It has been found that a continuous, concentration-dependent, unique signature for different gases is produced during thermal cycling. Once signature patterns are developed for different concentrations, an unknown gas concentration for which a signature pattern exists may be sampled, either by amplitude or time-dependent samples, in order to identify the gas in its concentration.

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San Jose, CA, United States of America

Gulu N Advani