Fast-Response Zirconia Sensor-Based Instrument for Measurement of the Air/Fuel Ratio of Combustion Exhaust

A fast-response zirconia sensor-based instrument has been developed to measure the air/fuel ratio (A/F) of combustion exhaust. This instrument uses a reduced-pressure sampling system which improves instrument response time (due to faster diffusion at lower pressures) and eliminates the need for a he...

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Bibliographic Details
Main Authors: Butler, James W, Haack, Larry P, Colvin, Alex D, McKelvy, Frederick E
Format: Report
Language:English
Online Access:Request full text
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Summary:A fast-response zirconia sensor-based instrument has been developed to measure the air/fuel ratio (A/F) of combustion exhaust. This instrument uses a reduced-pressure sampling system which improves instrument response time (due to faster diffusion at lower pressures) and eliminates the need for a heated sample line. The measured response time of the described instrument is 170 ms (0-90%) for a step-change in O2 concentration. The prototype instrument is easily calibrated in less than 2 min, requiring only nitrogen and room air for calibration. A complete description of the instrument is given. Results of tests comparing the instrument accuracy to a chemical balance technique are given. Also, a comparison study was conducted with the prototype instrument and a conventional zirconia sensor-based A/F monitor (Lamdascan, Sensors, Inc., Ann Arbor, Mich.) with respect to accuracy and response time.
ISSN:0148-7191
2688-3627
DOI:10.4271/840061