We start by simulating the condition of a fielded filter by selecting representative threat vapors and representative contaminant vapors. We assume that only contaminants that are moderately and strongly adsorbed can affect the residual life. A simulated contaminated filter is configured using contaminated carbon at the bed inlet and fresh carbon at the bed outlet. Breakthrough experiments are then completed using an organic to simulate the threat vapor. These data define residual life based on relative humidity (RH), threat vapor, contaminant chemical, and the extent of bed contamination. Using a novel residual life indicator approach that employs dual satellite beds, one sampling the filter air inlet and one sampling the filter outlet, chemical pulse tests are conducted. Simulated contaminated beds are tested at different RHs. The difference between the reference bed effluent concentration profile and the contaminated bed effluent concentration profile is correlated to the residual life using a simple algorithm.

plus-circle Add Review

comment

Reviews