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Reducing the Cost of Emissions Testing

BG®3 Partial Flow Dilution Sampling System

In the early 1970¹s, the U.S. Environmental Protection Agency (EPA) was formed in response to growing concern about air quality. The EPA developed emissions regulations that targeted the carcinogenic impact of engine exhaust, and set tough regulatory Auto Exhauststandards for manufacturers to develop cleaner engines.

Engine makers needed an instrument that could accurately measure the quantity of particulate pollution produced in engine exhaust to meet the regulatory standard. Throughout the 1980’s, expensive and cumbersome full-flow constant volume sampling (CVS) systems, the size of a city bus, were the only measuring device the EPA would accept data from.

SIERRA’S SOLUTION

Rob Graze, Senior Engineering Specialist at Caterpillar, contacted Sierra in 1991 with a proposition. Familiar with the successful relationship Sierra had forged with Caterpillar in the 1980’s, Graze suggested a new exclusive instrument development partnership based on his new patented Partial Flow Dilution Tunnel design.