Opacity Monitoring Articles

  • How do I choose audit filters for my opacity monitor?

    Ongoing quality assurance is important for any piece of measuring equipment. From a voltmeter to a spectrophotometer, calibration checks are needed to demonstrate that it is continuing to function within its design specification. An opacity monitor is no different, and the usual method for verification is to perform a calibration error check using traceable audit filters. These are neutral ...


    By AMETEK Land

  • Choosing flow monitors for CEMS applications

    As a result of the 1990 Clean Air Act Amendments1, 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, ...


    By Sierra Instruments, Inc.

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