Condensation Aerosol Generator SLG 270 produce monodisperse aerosols with definined properties in a wide range of particle size and number concentration as well. The aerosol generation principle is based on the controlled heterogeneous condensation acc. to Sinclair-LaMer mentioned in the directive VDI 3491 part 4.
Depending on the choice of the particle material either droplet or solid state aerosols can be generated.
The patented innovative concept in combination with state of the art control instruments and regulators guarantees quick and reproducible adjustment of both particle size and concentration.Both parameters of the outlet aerosol can be continuously monitored by means of the Process Aerosol Monitor PAM 510.
The HEPA-filter ensures cleanness of the carrier gas (nitrogen). In the atomizer a NaCl-solution is sprayed. Downstream the atomizer a diffusion dryer removes the water from the droplets to produce small crystals. The salt crystals concentration for the heterogeneous condensation is about 106 … 107 per cm³.
By means of the screen-bypass downstream to the diffusion dryer the nuclei concentration can be adjusted.
The size of the aerosol particles to be produced is mainly determined by the quantity of available vapour per nucleus. The vapour concentration can be adjusted by two parameters:
The saturation of the nuclei aerosol takes place in the saturator. The aerosol bubbles through the aerosol material which is held at constant temperature. Depending on the temperature and the material specific vapour pressure a definite saturation concentration of vapour is achieved in the bubbles. The bypass permits the more rapid adjustment of particle size by dilution, rather than by saturator heating or cooling. In the condensation chimney the superheated vapour-nuclei mixture is cooled down causing the vapour to condense onto the nuclei. For particularly high demands on the monodispersity only the core flow in the condensation chimney is exhausted.
The SLG 270 is also equipped with a screen unit for the defined salt core reduction (screen), which allows the generation of larger particles (Patent 43 12 983)
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