Structure

The rotary impactor head is made up of the components showm in the picture

Working principle

The air flow is conveyed through the acceleration nozzles and then directed against a rotary impactor disc, coated with low-volatility mineral oils

Depending on the cut size diameter chosen for the sampling (for example PM10, PM2.5, PM1), the particles with a diameter larger than the programmed one collide with the impactor disc and they stop here.

The new Rotary Impactor Head allows to overcome the limits of the standard sampling inlets, where the particles progressive accumulation on the impactor disc gradually modifies the characteristics of the impactor disc itself, causing a high and rapid reduction of the cut size efficiency and therefore calling for frequent cleaning interventions.

With the new Rotary Impactor Head, the impactor disc rotation on the axis of symmetry of the multi-jet impactor allows to increase the particulate matter deposition surface, making considerably slower the accumulation process and the progressive impoverishment of the grease film covering the impactor disc. Therefore, the granulometric cut efficiency is kept constant for a longer time compared with the traditional sampling inlets.

Rotary Impactor Head

On every accumulation point corresponding to the single nozzle, the particles tend to settle on a larger and larger no more flat impact surface, till the jet let circulate also the particles with a diameter higher than the cut size. In these conditions, the impact does no more take place on a greasy anelastic surface and the particles are free to bounce off the already accumulated material.

Impattore multi-jet standard

The slow impactor plane rotation allows to present constantly to the flow coming out from the nozzles an impact surface anelastic, plane and as poor as possible in accumulated material. So the particulate matter accumulates on a circular crown distributed on the rotary impactor disc surface. That allows to keep the optimal conditions for the particulate matter capture for a time remarkably longer, drastically reducing the frequence of the interventions needed for the impact plane cleaning.