The PPS-M operates by electrostatically charging particles passing through it and then measuring the total current caused by the electrified particles as they leave the sensor. Since the design allows the particulates to flow directly through the sensor without trapping them, it stays clean much longer, extending its life and reducing maintenance. Pegasor claims that the PPS-M will have low initial and life cycle costs.
The PPS-M was designed to work pretty much everywhere diesel engines are used including engine test bench monitoring, on-board vehicle monitoring, vehicle emission inspection and on-board diagnostics (OBD). It can also be installed upstream or downstream of particulate filters like those used by automakers to meet U.S. Tier 2 Bin 5, presumably to measure the effectiveness of those filters.
[Source: Dieselnet | Image: Garter Blue – C.C. 2.0]