Developing of an orifice-electrostatic filter with the varied gap distance for PM₂₅emission

A kind of motor vehicle emission is particulate matter or PM. Of all the types of PM, some PMs have a diameter of less than 2.5|rm or PM25. PM25 are recognized as the pollutants that harm human health. An effort that can be made to reduce this emission is by developing a PM25 filtration system. This research developed the PM25 filtration system based on high voltage direct current with varied of gap distance that was applied on motorcycles. The filters were made of four aluminum plates with a thickness of 0.15 mm arranged as anode and cathode probes installed before an orifice of the outlet. There were four variations in different gap distances between the plates: Fl with a distance of 14 mm, F2 with a distance of 12 mm, F3 with a distance of 10 mm, and F4 with a distance of 8 mm. The voltage that was originated from the battery by 12 V was converted 400Volt with a signal conditioning circuit. The filtering efficiency was calculated by measuring PM25 concentration before and after passing through the filter using Kanomax 3443 Digital Dust Monitor. The result showed that the filter could reduce PM25 concentrations from 63% to 70% depending on the gap distance between the plates.