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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


     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

Description

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 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.

Start-up

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

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

Dispersing

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.

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

Four different dispersing covers can be used for optimal dispersion.

Dispersion covers RBG system

Cover
Particle size
Reservoir diameter
Volume flow
A
< 0.1 – 100 µm
7 – 32 mm
33 – 80 l/min
B
< 0.1 – 100 µm
7, 10 and 14 mm
17 – 40 l/min
C
< 0.1 – 100 µm
7 mm
8 – 20 l/min
D
200 – 1,000 µm
7 – 32 mm
33 – 80 l/min
32 mm
88 g
800 mg/h
8 g/h

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.

Datasheet

Volume flow

8 – 180 Nl/min

Interfaces

USB type B

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 – 100 µm

Carrier/dispersion gas

Air, nitrogen

Pre-pressure

4 – 13 bar

Feed rate

1 – 1,000 mm/h

Reservoir inner diameter

7, 10, 14, 20, 32 mm

Maximum counter pressure

10 barg

Filling height

110 mm

Dispersion cover

Type A, type B, type C, type D

Compressed air connection

Quick coupling

Aerosol outlet connection

Øinside= 5 mm,
Øoutside = 8 mm

Power supply

115 – 230 V, 50/60 Hz

Dimensions

515 • 330 • 240 mm (H • W • D)

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)

Benefits


     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

Applications


     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