Patent ID: 7771654

Claim:
A flue gas monitoring system for measuring, in real-time, the concentration of gaseous components of a flue gas, which gaseous components include NO, NO 2 , and ammonia, which flue gas monitoring system comprising: a) an enclosure having a plurality of enclosing panels, wherein one panel is a top panel and one panel is a bottom panel and the remaining panels are side panels; b) at least one inlet for receiving a gaseous sample; c) at least one outlet for exhausting a gaseous stream; d) at least one door for accessing the interior of the enclosure; e) an NO sensor within the enclosure for generating an electrical output in response to the concentration of NO in a gaseous sample; f) a receiving means for receiving said electrical output from said NO sensor and visually displaying the concentration of NO; g) an NO 2 sensor within the enclosure for generating an electrical output in response to the concentration of NO 2 in said gaseous sample; h) a means for receiving said indicating output from said NO 2 sensor and visually displaying the concentration of NO 2 ; i) a scrubber within the enclosure for scrubbing SO 2 from said gaseous sample; j) an SO 2 sensor within the enclosure for generating an electrical output in response to the concentration of SO 2 in said gaseous sample; k) a receiving means for receiving said electrical output from said SO 2 sensor and visually displaying the concentration of SO 2 ; l) at least one NH 3 sensor within the enclosure for generating an electrical output in response to the concentration of NH 3 in said gaseous sample; m) at least one means for receiving said electrical output from said at least one NH 3 sensor and visually displaying the concentration of NH 3 ; n) a heater within the enclosure for raising the temperature within the enclosure; and o) a cooling means within the enclosure for lowering the temperature within the enclosure; p) wherein there are three sensors for generating an electrical output in response to the concentration of ammonia and wherein said three sensors are in series wherein the first sensor is calibrated for a lower ammonia concentration, the second for a mid range ammonia concentration and the third for a higher ammonia concentration.