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Laboratory Evaluation of Real-Time Smoke Particulate Monitors
The MetOne Instruments’ E-BAM sampler appears to be an accurate instrument when measuring smoke particulate. On average, the samplers tend to overestimate smoke particulate concentrations by 13.5 percent when compared to the FRM sampler. Correcting the reported values from the instruments by this amount will provide even better results. Results between instruments were relatively close, with a difference of 12 percent between the highest and lowest estimated values.
The E-Sampler also was fairly accurate when estimating smoke particulate concentrations. It overestimated mass concentrations by 13 percent over a wide range of concentrations. We only had one instrument to test, so we were unable to compare different E-Samplers to each other.
The DataRAM4 monitor overestimated the mass concentrations by a significant amount, although this was not unexpected based on the results of previous tests. There was a large disparity (49 percent) in the two instruments when estimating the mass concentrations with the particle size correction feature disabled. However, when this feature was enabled, the two instruments’ estimations were much closer to one another (within 11 percent). They overestimated the mass concentration of smoke by an average of 172 percent (2.72 times). Anyone using a DataRAM4 should enable the size correction feature, and when measuring smoke particulate, multiply the concentration by 0.37 (1/2.72).
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