RBG professional

Generation of test aerosols from powders, pollen, and spores for operation up to 10 bar counterpressure, mass flow approx. 0.04 – 800 g/h


RBG professional

Generation of test aerosols from powders, pollen, and spores for operation up to 10 bar counterpressure, mass flow approx. 0.04 – 800 g/h

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Low-concentration solid particle aerosols produced from powders are required for many applications in research, development and quality assurance and for the calibration of particle measurement devices.

For more than 25 years, the RBG system has been used worldwide with great success for the reliable dispersion of non-cohesive powders such as mineral dusts, active pharmaceutical ingredients, pollen, etc. in the size range of < 200 µm and with a fine fraction of < 100 nm. Monolithic solid materials such as blackboard chalk are finely dispersed with highest dosing constancy.

The special advantage of this dosing and dispersion system is that in the case of the RBG system, mass flows ranging from approx. 40 mg/h up to approx. 800 g/h are dispersed with the highest level of dosing constancy thanks to quick, easy exchange of the solid material reservoir.

RBG professional is pressure-resistant up to 10 bar counter pressure and can be operated with nitrogen as carrier gas.


The powder to be dispersed is filled little by little into the cylindrical solid material reservoir and compressed with a tamper. The Lucerne University determined an excellent reproducibility of the tamping density in the solid material reservoir with a deviation of 3.4 %. The filled solid material reservoir is inserted into the dispersing head of the RBG. The powder, which has thus been uniformly compressed across the filling level, is then conveyed onto a rotating brush at a precisely controlled feed rate. An adjustable volume flow streams over the tightly woven precision brush at a very high speed and tears the particles out of the brush. The dispersing head assembly consists of a dispersing holder, dispersing cover, precision brush, and solid material reservoir.

RBG - Funktionsprinzip - Schema - 116mm.png

Fig. 1: Schematic diagram of RBG system


Dosing is performed via the precisely controlled feed rate of the feed piston. The desired mass flows can be easily and reproducibly specified based on the cross section of the solid material reservoir, the precisely adjustable feed rate of the feed piston and the easy-to-determine tamping density of the powder in the reservoir.

Mass flows of RBG system (compacted density 1 g/cm³)

Reservoir diameter
Fill quantity
Feed rate 1 mm/h
Feed rate10 mm/h
Feed rate 100 mm/h
Feed rate 1,000 mm/h
7 mm
2.7 g
38 mg/h
380 mg/h
3.8 g/h
38 g/h
10 mm
5.5 g
78 mg/h
780 mg/h
7.8 g/h
78 g/h
14 mm
17 g
150 mg/h
1.5 g/h
15 g/h
150 g/h
20 mm
35 g
310 mg/h
3.1 g/h
31 g/h
310 g/h
32 mm
88 g
800 mg/h
8 g/h
80 g/h
800 g/h


The powder separated from the reservoir by the precision brush is almost completely dispersed into the constituent particles (see Fig. 2), in the dispersing head by the dispersing air flowing at high speed. The dispersing air flow is regulated automatically by an integrated mass-flow-control.


Fig. 2: Particle size distribution with the welas® digital 2000

Four different dispersing covers can be used for optimal dispersion.

Dispersion covers RBG system

Particle size
Reservoir diameter
Volume flow
< 0.1 – 200 µm
7 – 32 mm
33 – 80 l/min
< 0.1 – 200 µm
7, 10 and 14 mm
17 – 40 l/min
< 0.1 – 200 µm
7 mm
8 – 20 l/min
200 – 1,000 µm
7 – 32 mm
33 – 80 l/min

Pulse mode

The construction design of the RBG system allows for operation in "powder"/"no powder" pulse mode with cycle lengths ranging down to a second. The function can be used manually on the unit or via a connected computer.

Remote control

RBG professional can be optionally controlled via the delivered software from a Windows computer or tablet.


  • Very high short-term and long-term dosing constancy
  • Dispersion of virtually all non-cohesive dusts
  • Pressure-resistant up to 10 bar counterpressure
  • Easy and fast exchange of different solid material reservoirs and dispersing covers
  • Automatic determination and adjustment of the mass flow
  • Pulse mode
  • All unit parameters on LCD-display at a glance
  • Remote operation with included software
  • Device easy to clean
  • Little maintenance required
  • Low operating expenses


Volume flow 8 – 180 Nl/min
Weight Approx. 15 kg
Particle material Non-cohesive powders and bulks
Dosing time Several hours nonstop
Maximum particle number concentration Approx.107 particles/cm³
Mass flow (particles) 0.04 – 800 g/h (with an assumed compacted density of 1 g/cm3)
Particle size range 0.1 – 200 µm
Carrier/dispersion gas Air, nitrogen
Pre-pressure 4 – 13 bar
Maximum counter pressure 10 barg
Feed rate 1 – 1,000 mm/h
Compressed air connection Quick coupling
Reservoir inner diameter 7, 10, 14, 20, 32 mm
Filling height 110 mm
Dispersion cover Type A, type B, type C, type D
Aerosol outlet connection Øinside= 5 mm,
Øoutside = 8 mm
Interfaces USB type B
Power supply 115 – 230 V, 50/60 Hz
Filling quantity 2.7 g (reservoir Ø = 7 mm), 5.5 g
(reservoir Ø = 10 mm), 17 g (reservoir Ø = 14 mm), 35 g (reservoir Ø = 20
mm), 88 g (reservoir Ø = 32 mm)
(with an assumed compacted density of 1 g/cm3)
Dimensions 515 • 330 • 240 mm (H • W • D)


  • Filter industry:
    • Determination of fractional separation efficiency
    • Determination of total separation efficiency
    • Long-term dusting
    • Filter media and ready-made filters
    • Dust removal filters
    • Vacuum cleaners and vacuum cleaner filters
    • Car interior filters
    • Engine air filters
  • Calibration of particle measurement devices
  • Flow visualization
  • Inhalation tests
  • Tracer particles for LDA, PIV, etc.
  • Coating of surfaces


Brief Description
Brief product description in two-pages as PDF
Product Description
Detailed product description as PDF


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