Skip to main content

SLG 270

Condensation Aerosol Generator SLG 270 for generation of monodisperse aerosols, particle size and particle concentration adjustable

The Condensation Aerosol Generator SLG 270 produces monodisperse aerosols with definined properties in a wide range of particle size and number concentration as well.
Condensation Aerosol Generator SLG 270 frontside Condensation Aerosol Generator SLG 270 frontside, with two awards
The aerosol generation principle is based on the controlled heterogeneous condensation acc. to Sinclair-LaMer mentioned in the directive VDI 3491-4. 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.

Standards

VDI 3491-4
Interested? We will gladly advise you

+49 (351) 2166 430

contact form

Benefits

  • generation of monodisperse aerosols with adjustable particle size
  • generated aerosols consists of spherical and uncharged particles (electrically neutral)
  • rapid and reproducible adjustment of desired particle size (0,1…12 µm)
  • high particle number concentrations

Applications

  • calibration of particle measuring instruments
  • aerosol research
  • filter testing
  • determination of separation efficiencies
  • inhalation and toxicology studies

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 1E6 … 1E7 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:

- Saturation of the nuclei aerosol at definite temperature
- Dilution of the saturated nuclei aerosol with not saturated nuclei aerosol by means of a saturator bypass

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.

Parameter title Unit Value
setting resolution °C 1 (saturator and reheater temperature)
setting resolution l/h continously adjustable (saturator and screen flow rate)
aerosol, mass flow rate (aerosol substance) g/h ≤ 7,3
aerosol, particle size range µm 0,1 ... 12
aerosol, particle size range µm 0,1 ... 5
aerosol, particle size range µm 0,1 ... 8
setting range 3,4 °C ≤ 400 (saturator temperature und reheater temperature)
aerosol, volumetric flow rate L/h 200 ... 250
setting parameter 2 °C saturator and reheater temperature
setting range 1, 2 l/h 0 ... 250 (saturator and reheater flow rate)
setting parameter 1, 2 l/h saturator and screen flow rate
aerosol, distribution width (geometric standard deviation) - < 1,15
operating medium, aerosol substance 1 - filling volume mL 20 ... 60
operating medium, aerosol substance 1 - sodium chloride solution (for condensation core aerosol production)
power supply - 230 V AC, 50/60 Hz
operating medium, aerosol substance - filling volume mL ≤ 150
operating medium, gas/air - compressed air supply l/h 250 (5 bar)
operating medium, aerosol substance 2 - DEHS, Carnauba wax, stearic acid, Emery 3004, paraffine oil, ...
operating medium, gas/air - compressed air, nitrogen
environmental condition, max. counterpressure kPa 0,5
environmental condition, relative humidity % 5 ... 95
environmental condition, ambient pressure kPa 70 ... 110
environmental condition, temperature °C 0 ... 50
dimensions (w × h × d) mm 250 × 550 × 300
weight kg 19
  • Peters, C.; Altmann, J. Monodisperse aerosol generation with rapid adjustable particle size for inhalation studies Journal of Aerosol Medicine 6 (1993) 4, 307 - 315
    dx.doi.org/10.1089/jam.1993.6.307
  • Altmann J., Rudolph A. and Wessely B. Particle sizing of highly concentrated monodisperse aerosols J. Aerosol Sci. 25 (1994) 0, 523 - 524
    dx.doi.org/10.1016/0021-8502(94)90491-X
  • Borojeni A. A., Noga M. L., Vehring R. and Finlay W. H. Measurements of total aerosol deposition in intrathoracic conducting airway replicas of children Journal of Aerosol Science 73 (2014) 0, 39 - 47
    dx.doi.org/10.1016/j.jaerosci.2014.03.005