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Linearity tests

Thursday, June 08, 2017   By: john [1794] 2 Stars
Could someone explain how linearity test are performed on cems?

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Friday, June 09, 2017   By: Ross [390] 5 Stars
Linearity Testing as it relates to CEMS or Continuous Emission Monitoring is a laboratory analytical calibration technique that the distrusting EPA is demanding to be done in the field. This test requires skilled laboratory techniques. You judge for yourself.

So the question begs to be asked that for any given method of analysis such as emission monitoring - is the relationship between the instrument readings test results and the actual concentration reasonably linear? The answer is 5 percent linearity is the maximum. This is a sophisticated analytical technique that cannot be taken lightly and done by research scientist in the past.

The linearity test in a CEMS is basically a calibration check using calibrated gases that you purchase. 3 non-consecutive measurements should be made for each of the calibration gases at point zero, the low, then the mid, high, then again zero, low, mid, high, and again until done.

The linearity specification should require that the mean difference between the calibration gas value and emission sampling responds at each of the four points -meaning at zero, low, mid, and high - and be calculated from three measurements. The mean difference at all four test points must be
less than 5 percent for SO2 and NOx monitors and 0.5 percent O2 or CO2.

This linearity test is done after installation, when adjustments are done but not routine instrumentation drift, and done when repairs are needed, and at least quarterly.

Ross

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