One of the largest Cement factories in America was interested in reducing frequent visual emissions inspections mandated by new Portland Cement (MACT) rules in effect since June 2002. A second issue was the need to measure solids flow in the finish mill operation to determine the rejects flow rate. During a recent upgrade to the finish mill circuit, the rejects flow, which is traditionally measured using an impact flow meter, was eliminated due to the building height requirement of about 6 ft for such equipment. The plant was looking for a flow measuring device that could be incorporated in existing airslides without any building height requirements or other modifications. Both problems were resolved by installing triboelectric dust and bulk solids flow monitors.