Calibration checking for continuous emissions monitoring system
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United States of America Patent
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Issued Date -
Nov 20, 2008
app pub date -
May 15, 2007
filing date -
May 15, 2007
priority date (Note) -
Abandoned
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Abstract
A continuous emissions monitoring system is in fluid communication with a flue stack conducting exhaust gas from a combustion source. The continuous emissions monitor system comprises an analyzer for measuring concentrations of an analyte present in the exhaust gas. A probe is in fluid communication with the flue stack to acquire a sample of exhaust gas from the flue stack. The probe is also in fluid communication with and located upstream of the analyzer. The probe tends to remove analyte from the sample. A calibration checking system is in fluid communication with the probe. The calibration checking system includes a source that provides a flow of a known concentration of calibration material to be measured by the analyzer. The calibration material is the same as the analyte. A humidifier is associated with the source to provide moisture to a flow of calibration material. The moisture acts to cleanse removed analyte from the probe and thereby enable an accurate measurement of the concentration of the calibration material.
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