Choosing Flow Monitors for CEMS Applications

As a result of the 1990 Clean Air Act Amendments^l, electric power plants must reduce their emissions of sulfur dioxide and nitrous oxides—the primary causes of acid rain. The U.S. Environmental Protection Agency (EPA), in its proposed rules², designates the 111 Phase I fossil-fueled plants (roughly 268 boiler units) that must have continuous emis­sions monitoring systems (CEMS) installed, certified and operational by November 15, 1993. The EPA also designates the 662 Phase II plants (roughly 2,200 boiler units) that have a January 1, 1995 deadline.

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