The EPA issued a mandate called the Clean AirMercury Rule (CAMR) that requires all coal fired electric generating plants to monitor and report mercury emissions from their stacks. In order to achieve this reporting target, accurate measurement devices are a necessity. In addition, the amount of monitoring needed at a particular source plant is a function of its current output levels. In some cases, high levels of mercury emissions require continuous monitoring. Accurate measurement is most critically affected by one thing -- the amount of moisture content in the gas. It is imperative to keep the sampling draw on the stack gas above the dew point to prevent condensation and measurement variance.

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