Catalytica, Inc.

Gas Research Institute

International Engine Intellectual Property Company, LLC

David R Sheridan

Ralph Albert Dalla Betta

Daniel L Reed

Glenn C Morrison

A gas sampling system and method that utilizes a double aspirator design to precisely control the flow rate of a gas sample past a sensor (44, 46, or 48). The double aspirator design includes a primary aspirator (24) to draw a gas sample from the exhaust stack (14) at a first flow rate and a secondary aspirator (26) to draw a portion of the gas sample from the primary aspirator at a second flow rate past the sensors. In addition, a first pressure sensor (74) and second pressure sensor (76) are provided in order to monitor changes in the pressure differential across the sensor so that corresponding changes in the second flow rate can be accounted for by the control unit (18) when processing the measurement data from the sensor.

Gas sampling system and method

This invention is a process for detecting low concentration levels of sulfur oxides (SO.sub.2) in a flowing gas stream (typically a combustion exhaust gas stream) and a catalytic SO.sub.2 sensor system which may be used in that process.

SO.sub.2 sensor

This invention is a process for detecting low levels of nitrogen oxides (NO.sub.x) in a flowing gas stream (typically an exhaust gas stream) and a catalytic NO.sub.x sensor which may be used in that process.

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Menlo Park, CA, United States of America

David R Sheridan