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CEMS and making sure they pass. How many of you know how far your analyzer can drift before it fails? 
Let's look at a simple example.


NOx analyzer with a span of 250 ppm
What is desired 192 minus what you ran 194.9 = -2.9 then divide that by the span of 250 and times 100


(192-194.9)/250*100= -1.16

CEMS and whether they pass or fail

What is desired 192 minus what you ran 192.3 = 0.3 then divide that by the span of 250 and times 100


(192-192.3)/250*100= -0.12