The report contains the results of an instrumentation evaluation program. The objective of the program was to determine the suitability of available commercial instruments for the measurement of vehicle exhaust emissions. Seventeen automotive exhaust emissions measuring instruments were evaluated in terms of accuracy, repeatability, response time, cost, and several other parameters. Conclusions were made with respect to instrument types for measuring carbon monoxide, hydrocarbons, carbon dioxide, and oxides of nitrogen. A re-evaluation of instrumentation for performing analyses of automotive exhaust gases is recommended on a bi-annual basis. For the application of this system see PB-209 951 to PB-209 953. (Author)


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