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TEOM® monitors where introduce about fifteen years ago to provide engineers with real-time information about the particulate mass concentrations of diluted diesel exhaust. The instrument has gone though a number of changes over the years to reflect the current state of technology and the changing state of particulate regulations. This paper discusses the changes that have taken place in the instrument and performs a series of tests to determine the impact of: filter temperature, filter face velocity, filter pressure drop, and filter conditioning. The testing identified the item with the greatest impact is temperature. Lastly a method for setting up TEOM® monitor to optimize the filter loading and data quality is set out.

This study was performed to determine the effect of ceramic thermal barrier coatings (TBC) on the mass and composition of particulate emissions from a diesel engine. Thermal analysis demonstrated that TBCs are effective in reducing the volatile content of the total particulate matter. Results from this study indicate that the thermal analysis procedure used here is useful in assessing the effects of such engine modifications on particulate emissions.

Exhaust carbon concentration data provides a valuable look into the diesel engine combustion process. This type of information provides engineers with a qualitative determination of soot and organic particulate released to the ambient air by the engine, or after-treatment system. Although this type of information has been available for many years, the cost and time consuming nature of these laboratory tests has relegated them, until now, to a secondary position. With the emergence of automated instruments designed to provide on-line exhaust carbon concentration information in the test cell, this secondary position has now changed. Using devices like the Series 5100 Diesel Particulate Measurement System, engineers can receive rapid feedback about engine emissions and combustion.