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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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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Description
Low-concentration solid particle aerosols produced from powders are required for many research, development, and quality assurance applications and for calibrating 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 like blackboard chalk are finely dispersed with the highest dosing constancy.
The unique advantage of this dosing and dispersion system is that in the RBG system, mass flows range from approx. 40 mg/h up to approx. 800 g/h are dispersed with the highest level of dosing constancy.
RBG professional is pressure-resistant up to 10 bar counter pressure and can be operated with nitrogen as carrier gas.
Proven technology up to date
The powder to be dispersed is filled little by little into the cylindrical solid material reservoir and compressed with a tamper. 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 blows the particles out of the brush. The dispersing head assembly consists of a dispersing holder, dispersing cover, precision brush, and solid material reservoir.
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 quickly 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 |
RBG 1000 SD | 700 | 7 - 20 | 70 | ||
RBG 1000 SG | 300 | 7 - 20 | 70 | ||
RBG 1000 I | 700 | 7 - 28 | 70 | ||
RBG 1000 ID | 700 | 7 - 20 | 70 | ||
RBG 1000 ISD | 700 | 7 - 20 | 70 | ||
RBG 2000 | 700 | 16 - 32 | 180 | ||
RBG 2000 D | 700 | 16, 20, 28 | 180 | ||
RBG 2000 SD | 700 | 16, 20, 28 | 180 |
The powder separated from the reservoir by the precision brush is almost wholly dispersed into the constituent particles (see Fig. 2) in the dispersing head by 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
Cover | Particle size | Reservoir diameter | Volume flow |
|---|---|---|---|
A | < 0.1 – 200 µm | 7 – 32 mm | 33 – 80 l/min |
B | < 0.1 – 200 µm | 7, 10 and 14 mm | 17 – 40 l/min |
C | < 0.1 – 200 µm | 7 mm | 8 – 20 l/min |
D | 200 – 1,000 µm | 7 – 32 mm | 33 – 80 l/min |
RBG 2000 D | 700 | 16, 20, 28 | 180 |
RBG 1000 SD | 700 | 7 - 20 | 70 |
RBG 1000 SG | 300 | 7 - 20 | 70 |
RBG 1000 I | 700 | 7 - 28 | 70 |
RBG 1000 ID | 700 | 7 - 20 | 70 |
RBG 1000 ISD | 700 | 7 - 20 | 70 |
RBG 2000 | 700 | 16 - 32 | 180 |
RBG 2000 D | 700 | 16, 20, 28 | 180 |
RBG 2000 SD | 700 | 16, 20, 28 | 180 |
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.
RBG professional can be optionally controlled via the delivered software from a Windows computer or tablet.
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
Datasheet
| 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) |
Case Studies
- 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
Downloads
Brief Description
Brief product description in two-pages as PDF
Product Description
Detailed product description as PDF
Palas Brochure RBG System.pdf
(2 MByte)
