Patent ID: 7029920

Claim:
An emissions monitoring system for monitoring constituent concentration levels in an emission stream flowing through a combustion source exhaust stack, the system comprising: a sampling device configured and positioned for extraction of sample gas from the emission stream in the stack, the sampling device comprising a sample probe that includes means for cooling the sample gas in the sample probe to a temperature below about 350° F. but above a dew point temperature of the sample gas; a chamber positioned adjacent the stack, the chamber defining a chamber interior; means for maintaining in the chamber interior a temperature above a dew point temperature of the sample gas; at least one sample gas line in fluid communication with the sampling device, at least a portion of the at least one sample gas line being disposed in the chamber interior; means for removing particulate matter from the sample gas, the means for removing particulate matter being disposed adjacent the stack and being in fluid communication with the at least one sample gas line; an NO 2 converter disposed in the chamber interior in fluid communication with a first one of the at least one sample gas line downstream of the means for removing particulate matter, the NO 2 converter being operable at temperatures above the dew point temperature of the sample gas to convert NO 2 gas in the sample gas to NO gas; means for removing water from the sample gas, the means for removing being disposed adjacent the chamber and being in fluid communication with the at least one sample gas line downstream of the chamber; and at least one analyzer in fluid communication with the at least one sample gas line downstream of the means for removing water, each of the at least one analyzer being configured for determination of a concentration level of a constituent in the sample gas.