Model DA400

The DA400 DRUM Sampler is an aerosol sampler that collects particles in three size groups designed to match the needs of Mie Theory (G. Mie, 1976). This sampler is used in visibility and aerosol transport research. The DA400 also collects particles in sizes that are deposited in either the tracheobronchial or alveolar regions of the human respiratory tract.

continuous air monitor
  • Stage 0: (3.0 um) Inlet size selection
  • Stage A: (3.0 µm to 1.2 µm) The coarsest particles, while optically efficient, are too few in number to have much effect on visibility.
  • Stage B: (1.2 µm to 0.34 µm) The middle group is the heart of light scattering, with very high optical efficiency/particle at the peak of the Accumulation Mode.
  • Stage C: (0.34 µm to 0.15 µm) The finest stage normally possesses many particles, but the particles are highly inefficient in scattering light. Increasingly, these particles are thought to be most dangerous to humans.



Flow Rate

25.0 lpm

Raabe et al., 1988

Particle Size Cut

3.0 µm, 1.2 µm, 0.34 µm, 0.15 µm

Raabe et al., 1988

Stepper Motor

M-DRIVE 17Plus (Intelligent Motion Systems, Inc. - Marlborough, CT)


8 adjustable rotation rates



Pelican Storm Case (Pelican Products Inc.)

Case Dimensions

20.50" x 11.50" x 7.20" (52 x 29.2 x 18.3 cm)



6 lb (2.7 kg) without battery and case


Pneumatic Connectors

Chrome Plated Brass with Buna-N O-ring, ¼” (6.35 mm) Tube Coupling (Colder Products Company, St. Paul, MN)


Battery Charger

110 to 240 VAC


Battery Backup

Li-Ion Battery: 14.8v 1750mAh



IP68 Tested; UL, CSA and VDE approvals (Bulgin of Elektron Components Ltd. - Essex, UK)