The aerosol generator ATM 241 is a droplet generators and especially developed for

generating high aerosol concentrations with exceptional constancy (VDI-guidline 3491).

The main applications are generation of tracer particles or verifying measurements in very large

clean rooms according to the guidelines VDI 2083 and DIN EN ISO 14644. The innovative design of

these aerosol generators enables a flexible use.

A block with 4 slot nozzles is mounted in a nearly closed vessel of stainless steel. The nozzles are

connected to an external compressed air supply.During the operation all nozzles must be

immersed in the aerosol liquid 

Special Advantages

 Defined and highly constant particle number concentrations

 High consistency of the generated particle size distributions

 Generation of polydisperse aerosols,mainly <1 μm

 By variation of the nozzle pressure an number

of the connected nozzles the particle production rate can be varied over wide ranges

Applications

 Verifying measurements in very large clean rooms

 Test of HEPA and ULPA filter media

 Generation of tracer particles

Principle

Main component of the series ATM 241 is a novel nozzle (patented), which allows by its design to

generate a very fine aerosol. The figure below shows a schematic of this nozzle. The discharged

air stream from the nozzle creates a negative pressure where it enters the liquid thereby

carrying along small droplets. While the air travels through the liquid, the liquid works like a baffle

plate in order to separate larger particles. They are retained in the liquid and remain in the reservoir.