RBG 2000
The RBG system disperses non-cohesive powders, e.g., mineral dusts, active pharmaceutical ingredients, pollen, etc., within the size range of < 100 µm and with a fine fraction of < 100 nm. Monolithic solid materials, e.g., blackboard chalk, are finely dispersed with optimal dosing constancy.The feedstock reservoirs of RBG 2000 are longer (fill level= 180 mm) than the feedstock reservoirs of RBG 1000. Also a reservoir with a bigger diameter is available. Thus, the dosing time with the same mass flow can be extended by more than a factor of 3. Mass flows of between approx. 200 mg/h and 560 g/h are dispersed with optimal dosing constancy.
Optional: Pressure-resistant up to 3 bar
Operation principle
Proven technology
The powder to be dispersed is gradually poured into the cylindrical solid material reservoir and compressed with a tamper. The filled reservoir is inserted into the dispersing head on the RBG, and the powder, which has been uniformly compressed at the filling level, is conveyed onto a rotating brush at a precisely controlled feed rate. The adjustable volume flow moves over the tightly woven precision brush at a very high speed and blows the particles out.
The dispersing head assembly comprises a dispersing head, dispersing cover, precision brush, and solid material reservoir.
Fig. 1: RBG system schematic diagram
Dosing is performed based on a precisely controlled feed rate on the feed piston. The desired mass flows can be quickly and reproducibly defined based on the cross-section of the reservoir, the precisely adjustable feed rate of the feed piston, and the compacted density of the powder in the reservoir.
Mass flows of RBG 1000 / 2000 (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 700 mm/h |
|---|---|---|---|---|---|
| 7 mm (RBG 1000) | 2.7 g | 38 mg/h | 380 mg/h | 3.8 g/h | 26.6 g/h |
| 10 mm (RBG 1000) | 5.5 g | 78 mg/h | 780 mg/h | 7.8 g/h | 54.6 g/h |
| 14 mm (RBG 1000) | 17 g | 150 mg/h | 1.5 g/h | 15 g/h | 105 g/h |
| 16 mm (RBG 2000) | 30 g | 200 mg/h | 2 g/h | 20 g/h | 140 g/h |
| 20 mm (RBG 1000) | 35 g | 310 mg/h | 3.1 g/h | 31 g/h | 217 g/h |
| 28 mm (RBG 1000) | 49.2 g | 616 mg/h | 6.16 g/h | 61.6 g/h | 430 g/h |
| 32 mm (RBG 2000) | 88 g | 800 mg/h | 8 g/h | 80 g/h | 560 g/h |
Table 1: Mass flows of RBG system (compacted density 1 g/cm3)
The powder conveyed from the reservoir by the precision brush is virtually completely dispersed into individual particles up to < 100 nm by the dispersing air in the dispersing head (see Fig. 2).
Fig. 2: Particle size distribution with welas® digital 2000
Fig. 3: Type A dispersing cover
Two different dispersing covers can be used for optimal dispersion (see Fig. 3, additional details under "Accessories"), including Type A and Type D.
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 |
Table 2: Dispersion covers
Different versions of the RBG system
| System | Feed rate mm/h | Reservoir diameter in mm | Reservoir length in mm | Min. mass flow | Max. mass flow |
|---|---|---|---|---|---|
| RBG 1000 | 700 | 7 - 28 | 70 | 3.8 g/h | 430 g/h |
| RBG 1000 D | 700 | 7 - 20 | 70 | 3.8 g/h | 219 g/h |
| RBG 1000 G | 300 | 7 - 28 | 70 | 3.8 g/h | 184 g/h |
| RBG 1000 GD | 300 | 7 - 20 | 70 | 3.8 g/h | 94 g/h |
| RBG 1000 L | 700 | 10, 14 | 70 | 3.8 g/h | 107 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 |
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
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 using a remote control or PC.
Benefits
Your special advantages
- Optimal short-term and long-term dosing constancy
- Double the dosing time in comparison with the RBG 1000
- Disperses virtually any non-cohesive dusts
- Easy to switch out different solid material reservoirs and dispersion covers
- Easy to determine and adjust the mass flow
- Able to adjust higher mass flows than the RGB 1000
- Pulse mode
- Easy to clean
- Quick and easy to operate
- Reliable function
- Low maintenance
- Reduces your operating expenses
Applications
Individual solutions for various industries
- Filter industry
- Determination of fractional separation efficiency
- Determination of total separation efficiency
- Long-term dusting
- Filter media and assembled filters
- Dust filters
- Vacuum cleaners and vacuum filters
- Car interior filters
- Engine air filters
- Calibrating particle measurement devices
- Flow visualization
- Inhalation experiments
- Tracer particles for LDV, PIV, etc.
- Surface coatings
Technical features
In detail
- Particle size range
- 0.1 – 100 µm
- Maximum particle number concentration
- Ca. 107 particles/cm3
- Volume flow
- 40 – 80 Nl/min
- Mass flow (particles)
- 1 – 560 g/h (with an assumed compacted density of 1 g/cm3)
- Filling height
- 180 mm
- Filling quantity
- 36 g (reservoir Ø = 16 mm), 56 g (reservoir Ø = 20 mm), 110 g (reservoir Ø = 28 mm), 144 g (reservoir Ø = 32 mm)
- Power supply
- 115 – 230 V, 50/60 Hz
- Particle material
- Non-cohesive powders and bulks
- Dosing time
- Several hours nonstop
- Pre-pressure
- 4 – 8 bar
- Carrier/dispersion gas
- Random (generally air)
- Maximum counter pressure
- 0.2 barg
- Compressed air connection
- Quick coupling
- Feed rate
- 5 – 700 mm/h
- Reservoir inner diameter
- 16, 20, 28, 32 mm
- Aerosol outlet connection
- Dispersion cover type A: Øinside= 5 mm, Øoutside = 8 mm; Dispersion cover type D: Øinside= 5 mm, Øoutside = 8 mm
- Dispergierdeckel
- Type A, Type D
- Dimensions
- 1.160 • 530 • 500 mm (H • B • T)
- Weight
- Approx. 40 kg
