Pressure drop refers to the pressure differential across the filter media, across the baghouse, or across the entire dust collection system. It is a good indicator of the amount of dust that the filter media is accumulating and, if regularly monitored, the condition of the filter bags.
In general, a sudden drop in the differential pressure denotes a leak in the dust collection system. Whereas a sudden or sharp rise in the differential pressure denotes that the filter bags are becoming blinded or “caked” with particulates.