RBG 1000

Generation of test aerosols from powders, pollen, and spores, mass flow approx. 10 mg/h – 430 g/h


RBG 1000

RBG 1000

Generation of test aerosols from powders, pollen, and spores, mass flow approx. 10 mg/h – 430 g/h



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 < 100 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 1000, mass flows ranging from approx. 10 mg/h up to approx. 430 g/h are dispersed with the highest level of dosing constancy thanks to quick, easy exchange of the solid material reservoir. The fill level of the feed stock reservoir is 70 mm.


  • Pressure-resistant up to 3 bar
  • New: Low pressure operation from 300 mbar (absolute pressure), operation with nitrogen


The powder to be dispersed is filled little by little into the cylindrical solid material reservoir and compressed with a tamper. In the context of the validation of the guideline "Prüfverfahren für mobile Raumluftreinigungsgeräte" at the Lucerne University of Applied Sciences and Arts an excellent reproducibility of the tamping density in the solid material reservoir was determined. The deviation of the tamping densities of five fillings was just 3.4 %.

The filled solid material reservoir is inserted into the dispersing head of the RGB, and the powder, which has thus been uniformly compressed across the filling level, is 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 entire material delivered can optionally be determined gravimetrically with the RBG 1000 L.

The dispersing head assembly comprises a dispersing head, dispersing cover, precision brush, and solid material reservoir.

Schematic of the RBG system.jpg

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 series.JPG

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


The powder separated from the reservoir by the precision brush is almost completely dispersed into the constituent particles, down to < 100 nm (see Fig. 2), in the dispersing head by the dispersing air flowing at high speed.

Größenverteilung Prüfstaub mit welas digital 2000.png (2)

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

Dispersion covers A, B, C

Fig. 3: Dispersing covers, type A,. type B and type C

Four different dispersing covers can be used for optimal dispersion (see Fig. 3, additional details under "Accessories").

Dispersion covers RBG.JPG

Table 2: Dispersion covers

versions of RBG system.JPG

Table 3: Different versions of the RBG system

I = version for inhalation D = pressure-resistant G = low feed rate L = easily removable and weighable dosing unit S = nitrogen version

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 set manually via the "Stop/Start", and "Forward" keys or automatically via an electric timer switch.

All RBG versions can be optionally controlled via remote control or via computer.


  • Highest short-term and long-term dosing constancy
  • Disperses virtually all non-cohesive dusts
  • Easy exchange of different solid material reservoirs and dispersing covers
  • Easy determination and adjustment of the mass flow
  • Pulse mode
  • Device easy to clean
  • Quick and easy to operate
  • Reliable operation
  • Little maintenance required
  • Reduces your operating expenses


Volume flow
0.5 – 5.0 m3/h
Power supply

115/230 V, 50 – 60 Hz
Dimensions 465 • 320 • 200 mm (H • W • D)
approx. 19 kg
Particle material
Non-cohesive powders and bulks
Dosing time
Several hours nonstop
Maximum particle number concentration
ca. 107 particles/cm3
Mass flow (particles) 0.04 – 430 g/h (with an assumed compacted density of 1 g/cm^3)
Particle size range 0.1 – 100 µm
Carrier/dispersion gas
random (generally air)
Pre-pressure 4 – 8 bar
Feed rate

5 – 700 mm/h
Reservoir diameter

7, 10, 14, 20, 28 mm
Maximum counter pressure
200 mbarg
Reservoir length

70 mm
dispersion cover Type A, type B, type C, type D
Compressed air connection
Quick coupling
Aerosol outlet connection Dispersion cover type A: Øinside= 5 mm, Øoutside = 8 mm; Dispersion cover type B: Øinside= 3.6 mm, Øoutside = 6 mm; Dispersion cover type: Øinside= 2.5 mm, Øoutside = 6 mm
Filling quantity 2.7 g (reservoir Ø = 7 mm), 5.5 g (reservoir Ø = 10 mm), 10.8 g (reservoir Ø = 14 mm), 22 g (reservoir Ø = 20 mm), 43 g (reservoir Ø = 28 mm)


  • 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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