BMD-1000-Bag Mini Diluter

    Takes a small sample of vehicle exhaust, dilutes it with zero air at a constant dilution ratio, and collects proportional samples in bags for later analysis. The BMD's low dilution ratio maximizes bag concentrations for measurement by standard bag analyzers. A purified diluent improves accuracy by eliminating the effect of background pollutants on test results. Two small critical flow venturis (CFV)s - one for diluent and one for sample gas - provide a stable and reliable dilution ratio. Electropolished stainless-steel lines, new bag materials, and heated components minimize HC off-gassing and hang-up. A mass flow controller fills the sample bags in proportion to the exhaust flow rate. Software corrections for the effect of gas composition ensure precise proportionality.

FEATURES

Critical flow venturis (CFVs) - one for diluent, one for sample gas - provide a reliable and stable dilution ratio. CFVs are less affected by gas composition than are mass flow controllers. Pressure regulation and temperature control keep the dilution ratio constant. small dilution ratio maximizes sample-bag concentrations, extending use of standard bag analyzers for SULEV analysis. New materials for sample bags eliminate systematic HC off-gassing typical of Tedlar bags. Minimum internal plumbing - short, small-diameter lines - minimize HC hang-up and optimize response time. Heated sample line and oven prevent condensation of the sample before it is diluted. Contaminant-free diluent (zero air or nitrogen) eliminates need for ambient- bag measurement.

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