1977-02-01

A Quality Control Technique for Correlating Exhaust Gas Analysis Systems 770138

A simple, inexpensive, critical flow blender has been developed for filling a tedlar bag with controllable concentrations of HC, NOx, CO2, and CO gases at levels encountered in automobile emissions testing. According to a daily schedule, a technician takes the bag to all analyzer sites in the laboratory for analysis. The concentrations indicated by each site are compared to the overall averages.The results are stored in a computerized data base from which control charts, statistical analyses, and interpretations of significant differences among test sites can be made.The precision, accuracy, and statistical interpretations of the data are discussed.

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