Model ACI 2 Stage -Andersen Cascade Impactor

Andersen Cascade Impactor 2 stages is one of the confgurations of Andersen Cascade Impactor 6 stages Viable. It is used when size distribution is not required and only respirable and non-respirable segregation/fractions and total counts are needed. The Two Stage Viable Impactor consists of two sampling stages. When air is drawn through the sampler, multiple jets of air direct any airborne particles on to the surface of the collection plate. The Two Stage Viable Impactor requires an exact fow rate of 28.3 L/min. Particles are collected directly in the Petri (ø 90 mm) flled with the most appropriate culture medium. After sampling, inoculated agar plate is incubated at the appropriate temperature for times ranging from hours for a fast-growing bacterium to develop a micro colony, to days for a fungus to develop into a visible colony. The mean number viable particles (aerobic bacteria or fungi) per unit of air can be calculated.