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Real-Time Smoke
Particulate Sampling
Fire Storm 2000

Results (continued)

Optec NGN-3 Nephelometer

The Optec NGN-3 nephelometer was operated in both Missoula and Hamilton. Figure 23 shows the results of both sets of tests. The instruments performed almost identically at both Missoula and Hamilton. The instruments overestimated the smoke mass concentration by about 42 to 44 percent with a y-intercept of 9 to 11 µg/m³. Both had correlation coefficients greater than 0.99. Figure 24 shows the results from combining both sets of tests. The combined instruments overestimated the mass concentration by 43 percent with a y-intercept of -11.01 µg/m³. The correlation coefficient was 1.00.

Image of a graph showing the combined results of the Optec NGN-3. and the BGI PQ 200.
Figure 23—Results from the Optec NGN-3 nephelometer and
the BGI PQ 200 federal reference method sampler in Missoula and
Hamilton, MT. The Missoula and Hamilton, MT, tests are separate.

Image of a graph showing the combined results of the Optec NGN-3 and the BGI PQ 200.
Figure 24—Combined results of the Optec NGN-3 nephelometers in
Missoula and Hamilton and the BGI PQ 200 federal reference method sampler.

-Continued-

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