- Accuracy : ± 0,5 %
- Flow range from 12 l/h to 14 m3 /h
- Accuracy consistency
- Entirely tight system : no environmental impact
- Low maintenance
- No need for drop tests
- Few wear parts
- Manual or automatic refill
RBP
Categories
All Dosing granular Flow measurement granular Dosing powder Flow measurement powder Light materials Controllers & electronic Static weighing Calibration chain
Loss-in-weight GRAVIMETRIC feeders
Function :
The feeders work using the principle of controlled Loss-In-Weight.
The hopper with its extraction device (screw) is installed on a weighing system giving continuously to the controller the measure of weight.
The loss of weight by time unit (measuring sampling time) represents the actual proportioning flow rate.
Regulation :
The controller compares the actual measured flow to the setpoint and calculates the drive command signal to be sent to the screw speed controller.
The corrective actions made are saved and reflect the volumetric behaviour of the system.
Refill :
The continuous measure of weight in the hopper allows, according to two configurable thresholds (high and low), to manage the refill system(s) feeding the hopper.
During this refill phase, the screw speed is controlled according to its volumetric efficiency, memorized during the previous controlled emptying phase(s).
Applications – Dosing :
- Ground slag
- Anhydrite
- Silicium fumes
- Coke fines
- Plaster
- Starch
- Filter
- Dust
- Cement
- Lime
Customer benefits
Advantages
- Horizontal stirrer in lower part that ensures material homogeneity. (Option: vertical stirrer for poor flowing products)
- Bearing at screw outlet for a better centering in the tube (less cantilever).
- Enforced tightness by glands, chicanes, and 4 teflon braids.
- Inspection door in lower part for eventual replacement of horizontal stirrer without dismantling the whole feeder.
- Execution: Steel S235-JRG2, stainless steel 304 and 316
Options
- Vertical stirrer
- Forced fan P>0,55 kW
- Inlet counter flange
- Outlet counter flange
- Digital load cells
- High level probe
- Junction box for motor
- Support feet
- Feeding gate
Feeding examples
(~ 10 time of the max flow rate)
- Gravitational
- Vibrating float,
- Fluidized float,
- Flow control gate,
- Archimedean screw
- Big-bag, emptying station, etc.
Controller
The flowrate at the feeder discharge point is maintained constant by electronic controller SCM-3* at the setpoint value. Detailed alarm informations are obtained via the display (SDU)
* SCM-3: Field or Panel version : doc : SCM-3-F.260.001-E. or SCM-3-P.260.001-E.
Mobile application
The SCM-3 is supplied with a Process Display Unit off ering a 5-inch touch screen and 16.7 million colors.
As an option a mobile application is proposed.
Dimensions and flow range
| Model | Gravimetric | Screw | Hopper capacity |
|---|---|---|---|
| RB | P | 34-68 | 100-250 |
Dimensions/weight
| Hopper capacity |
Dim. "A" (mm) |
Total feeder weight |
|---|---|---|
| 100 L | 706 | ~ 247 kg |
| 150 L | 827 | ~ 251 kg |
| 250 L | 1092 | ~ 260 kg |
Weight of frame : 57 kg
Inlet bellows
| ø Total feeder weight | D1 | D2 |
|---|---|---|
| ø 150 | 126 | 206 |
| ø 200* | 206 | 256 |
D1 : ø outlet feeding system
D1 : ø inlet weighing hopper RBP
* : except with vertical stirrer
| ø Screw | Max flow in dm3/h | Min flow in dm3/h | Screw speed max./min. (rpm) | Dimension "E" (mm) |
|||
|---|---|---|---|---|---|---|---|
| Theoretical values of flow rate | Distance inlet/outlet (screw) | ||||||
| ø34 | 500 | 12 | 408/10 | 550 | 650 | - | - |
| ø 52 | 1200 | 47 | 256/10 | 550 | 650 | 750 | - |
| ø 68 | 3100 | 257/10 | -- | - | - | 750 | 850 |
Flow range : 10 to 100% of nominal
RScrew filling ratio : 90%
If flow < 100 kg/h : SFT loadcells
Dimensions and flow range
| Model | Gravimetric | Screw | Hopper capacity |
|---|---|---|---|
| RB | P | 80-150 | 250-1000 |
Dimensions/weight
| Hopper Capacity |
Dim. "A" (mm) |
Total feeder weight |
|---|---|---|
| 250 L | 788 | ~ 385 kg |
| 500 L | 1116 | ~ 419 kg |
| 750 L | 1446 | ~ 443 kg |
| 1000 L | 1776 | ~ 469 kg |
Weight of frame : 90 kg
Inlet bellows
| ø inlet | D1 | D2 |
|---|---|---|
| ø 150 | 168 | 206 |
| ø 200* | 219 | 256 |
| ø 300 | 324 | 356 |
D1 : ø outlet feeding system
D1 : ø inlet weighing hopper RBP
* : except si agitateur vertical
| ø Screw | Max flow in dm3/h | Min flow in dm3/h | Screw speed max./min (rpm) | Dimension "E" (mm) |
|||
|---|---|---|---|---|---|---|---|
| Theoretical values of flow rate | Distance intlet/outlet (screw) | ||||||
| ø 80 | 4000 | 200 | 197/10 | 800 | 1000 | - | - |
| ø 100 | 7000 | 430 | 163/10 | 800 | 1000 | 1200 | - |
| ø 125 | 10000 | 810 | 123/10 | - | 1000 | 1200 | 1400 |
| ø 150 | 14000 | 1400 | 98/10 | - | 1000 | 1200 | 1400 |
Flow range : 10 to 100% of nominal
Screw filling ratio 90%
