Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Calorimeter
Patent
1996-07-01
1999-01-12
Davenport, Avis M.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Calorimeter
422 83, 422 96, 422 98, G01N 2500, G01N 2520, G01N 2700, G01N 3100
Patent
active
058583068
ABSTRACT:
A modified noble metal catalyst based calorimetric sensor for sensing non-methane hydrocarbons in an automotive exhaust gas stream includes a first sensing element (105) with an output that provides a signal (111) indicative of a concentration of indicative of non-methane hydrocarbons, hydrogen (H.sub.2), and carbon monoxide (CO). A compensating sensing element (107) has an output that provides a compensating signal (113) indicative of a concentration of hydrogen (H.sub.2) and carbon monoxide (CO). A circuit for combining the signal and the compensating signal provides a combined signal indicative of a measure of non-methane hydrocarbons in the automotive exhaust gas stream.
REFERENCES:
patent: 5451371 (1995-09-01), Zanini-Fischer et al.
"Detection of Methane/Butane Mixtures in Air by a Set of Two Microcalorimetric Sensors" by V. Sommer, R. Rongen, P. Tobias and D. Kohl from Sensors and Actuators (1992), published by Elsevier Sequoia, pp. 262-265.
"The Role of Catalysis in Solid-State Gas Sensors" by S. Gentry and T. Jones, from Sensors and Actuators10 (1986), published by Elsevier Sequoia, pp. 141-163.
Adams Neil J.
Duong Dao
Joseph Jose
Oh Seajin
Plee Steven L.
Davenport Avis M.
Hopman Nicholas C.
Motorola Inc.
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